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2500k prime stable, but suddenly droping frames in games/bench ?

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January 16, 2012 1:38:49 PM

Hey guys !

I have a strange problem, my overclock with my asus sabertooth and 2500k is good and stable. No problems in prime, idle or games. BUT, suddenly some times when i for instance do 2 benchmarks after each other i get correct score on the first, but the second one i suddenly have 30-50 less frames ?? what ? Was the same with another mobo also. And this only happens some times... i just did 2 3dmark vantage after each other and first got 18,4k then next one i got 14k.

And i can sometimes just restart my computer and the problem goes away, then i can play and do benchmarks all day long without problems, any suggestions ? its quite annoying... :fou: 
a b K Overclocking
January 16, 2012 2:14:16 PM

How are your system temps at idle and under load?
January 16, 2012 4:55:08 PM

COLGeek said:
How are your system temps at idle and under load?



30-35 idle and 55-60 at load.... 1,4v volt cpu with 4,7ghz, 1,15-ish vccio. Ram stock at 1066 @ 1,5v now. Strange thing is that this only happens some times, for instanse i just did a little test, got 160-165 fps at one point, and then i restarted and had suddenly 70-80 at the same point with the exact same everything...

Also actually got a bsod 116 just now... Strange that this is only some times, other times my computer is on 24/7 for weeks without a single problem with this.
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a b K Overclocking
January 16, 2012 5:09:26 PM

What make/model of PSU are you using?
January 16, 2012 5:25:45 PM

COLGeek said:
What make/model of PSU are you using?



An old but good Corsair 750w... had some problems with my previous mobo with i though could be the psu, but after testing it with high overclock, 6950 crossfire and stuff it seemed fine. (turned out to be a bad mobo btw :) )

I tired something now tho that seemed to fix the problem, i just loaded optimized settings in bios, started it up, then loaded my overclocked settings again... now it seems to be good like it should. But i still want to find out why it does this tho, and i really appreciate the help :) 
a b K Overclocking
January 16, 2012 5:30:13 PM

So, what all are you OCing? CPU, yes. GPU? Memory?

I NEVER recommend OCing memory, the increase (minor) gained in performance is usually trumped by stability. OC the CPU and GPU, but leave your memory at stock. The system will be much more stable that way.
January 16, 2012 5:35:35 PM

COLGeek said:
So, what all are you OCing? CPU, yes. GPU? Memory?

I NEVER recommend OCing memory, the increase (minor) gained in performance is usually trumped by stability. OC the CPU and GPU, but leave your memory at stock. The system will be much more stable that way.


Just cpu.... gpu and memory it stock. I agree with you, no really gain in oc the memory. I just find it so strange that it suddenly messes with the frames, and now that i just re-loaded my overclock "profile" again is much better... Everything is the same tho. I don't get it...
a b K Overclocking
January 16, 2012 7:37:23 PM

A heat or power fluctuation could cause the CPU to step down and cause such a problem. Try running some tests at stock speed to see what happens.
a b K Overclocking
January 17, 2012 3:35:57 PM

What you are experiencing is CPU Thermo Throttling. Run CPU-Z to monitor your clock speed and Real Temp for your temps then P95 and note your cpu speed as temp goes up.

This guide will tell you what settings to have so your CPU does not do that. But heed this warning; high heat can killl your CPU!
a c 100 K Overclocking
January 17, 2012 4:03:23 PM

Just my thoughts... 1.4V is a pretty high Vcore, while the Vccio is very low. I would recommend bumping the vccio up to 1.25, and you should be able to drop the Vcore a similar amount.

Worth trying anyway. I've only taken a 2500k up to 4.5 and a 2600k up to 4.6, and neither required much fiddling with voltages.
January 17, 2012 5:35:40 PM

arthurh said:
What you are experiencing is CPU Thermo Throttling. Run CPU-Z to monitor your clock speed and Real Temp for your temps then P95 and note your cpu speed as temp goes up.

This guide will tell you what settings to have so your CPU does not do that. But heed this warning; high heat can killl your CPU!



I have on cpuz, real temp and HW monitor at all times and always keep an eye on it. I have done what you say at least 30 times during the last weeks, haven't noticed anything with my cpu speed as the temps go up, they seem kinda rock stable at where they should. But i may be blind and i don't know half what you know, so i'll have a look and test/read thru you link ! :) 

I also tried with everything in bios stock now, and i have the same problem then. Even got a 116 bsod doing a 3dmark earlier today... woot ?


wolfram23 said:
Just my thoughts... 1.4V is a pretty high Vcore, while the Vccio is very low. I would recommend bumping the vccio up to 1.25, and you should be able to drop the Vcore a similar amount.

Worth trying anyway. I've only taken a 2500k up to 4.5 and a 2600k up to 4.6, and neither required much fiddling with voltages.


I've heard and read that the vccio should stay below 1,2v for 24/7... I'm more worried about the vccio voltage than the cpu voltage. But you have a good point tho, i'll give it a try :) 
January 17, 2012 5:58:27 PM

After doing a prime95 now my mhz goes from 4700,3 to 4700,8mhz.... on a really rare occasion it goes to 4699,8 and 4701.... but that happens for like half second ones in a blue moon...

I though that cpu thermal throttling was when cpu reach its tj/tc max temp and starts to slow it self down to prevent damage ? And with my cpu running 4,7ghz at 1,4v in prime for hours without reaching 65c i don't really see why it should be a thermal throttling problem ?
a c 100 K Overclocking
January 17, 2012 6:11:46 PM

That's not entirely unheard of, I think you might need to disable EIST.
January 17, 2012 6:22:28 PM

wolfram23 said:
That's not entirely unheard of, I think you might need to disable EIST.


I'm on a new motherboard now, normal i use gigabyte... Eist is the speedstep thing right ? I have all the power saving and stuff like that off, that i know off. Like c1 and such... i don't like my cpu jumping about :) 

I really appreciate all the help, this problem is annoying as hell. I'll write up some key things to keep things simple...

  • Problem come with stock setting in bios and 4,7ghz @ 1,4v.
  • My cpu is prime stable for hours.
  • At many hours prime im at 65c at max, running a big water cooling system.
  • Example: Had 4,7ghz @1,4v yesterday, all good. Did benches and games. Same result 3dmarks multiple times after each other. Pc stayed on over night and then suddenly i had shity frames in games and 3dmark again. Sometimes running 2 3dmarks after each other give me insane differers in score with same settings.
  • Ram is running at stock voltage and everything.
  • Psu is good/big enough.
  • Cpu score in all tests are fine and spot on, only gpu scores that suddenly drop...
    a c 100 K Overclocking
    January 17, 2012 6:28:37 PM

    Alright, well what's going on with your GPUs then? Seems like you're fine on the CPU side.
    January 17, 2012 6:38:13 PM

    wolfram23 said:
    Alright, well what's going on with your GPUs then? Seems like you're fine on the CPU side.


    Thats the question mate :)  Sorry if i'm a bit confusing to understand, i'm not from a English speaking country. My cpu seems fine, i need a bit much volt just for 4,7ghz tho, but what the hell... its on a big water loop and i remember my old cpu which people said i would kill it withing mounths at 1,4v and i had like 1,5v for 3 years 24/7 :)  Was the old e8600...same story with the one before that again...

    Seems to kinda be a gpu thing ye, but it only happens some times... thats the strange part. Like now i did 2 3dmarks with identical score, and suddendly i can do another 3dmark and then the gpu score is low as hell. I have no idea here now... will probably try a mates gpu card a couple days
    a c 100 K Overclocking
    January 17, 2012 6:41:25 PM

    Have you tried running GPUZ in the background with sensors running to check what all the temps are on the GPU? It will read more than just core temp if available, and sometimes it's the VRM or VRAM that are heating up and causing issues.

    Otherwise you might want to simply try a fresh driver installation.
    January 17, 2012 6:45:48 PM

    wolfram23 said:
    Have you tried running GPUZ in the background with sensors running to check what all the temps are on the GPU? It will read more than just core temp if available, and sometimes it's the VRM or VRAM that are heating up and causing issues.

    Otherwise you might want to simply try a fresh driver installation.


    Good point, i can try that. Driving down to a friend and borrowing his card some days... I have tried fresh driver after i tried a crossfire with 2 other cards a week ago, so i don't think that is the problem. I'll try to monitor the gpu tho :) 
    January 17, 2012 9:39:47 PM

    Another thing i noticed after reading many 2500k overclocking guide and stuff is that i can't understand how they manage to get a high clock on so little voltage. Both me and my mate with the same ram, mobo and cpu both need to have 1,4v + to get 4,7ghz stable... And i've tried everything.... i don't get it
    a c 100 K Overclocking
    January 17, 2012 10:00:56 PM

    4.7ghz is really high. Not much more to it than that. Usually around 4.4 to 4.5, the efficiency falls off and the voltage spikes.
    January 18, 2012 1:04:04 AM

    wolfram23 said:
    4.7ghz is really high. Not much more to it than that. Usually around 4.4 to 4.5, the efficiency falls off and the voltage spikes.


    Mehh... i was hoping for either more mhz or less voltage. I clocked my mates 2500k, rock stable at 4,5ghz @ just under 1,3v and did some 3dmarks and stuff at 5ghz @ 1,39v :D 


    Could it all be that i clocked by not using the turbo mode ? I now have 4,7ghz @ 1,4v using the turbo mode and with VRM Frequency change to 350. Also have the duty and phase to extrem.... could that be it or is there no real difference clocking with turbo and non-turbo in bios ?
    a c 100 K Overclocking
    January 18, 2012 2:29:04 AM

    Well for turbo to be on and working you need EIST on as well, but I don't know that you're able to actually use it once you've manually changed the multiplier. Does your frequency/multiplier change depending on if you have 1, 2, 3, or 4 threads going? Try Intel Burn Test, you can set the amount of threads to use.

    I've OCed with turbo boost on my system, but it's set up differently. I was able to get my base clock to 177, but the multipliers are locked. Still, that's a pretty good increase as I was running 3.7 -> 4.2ghz turbo on an i5 750. Now I just run straight 4ghz, though.

    Anyway, not sure about duty but the phase power should allow more power and a more stable voltage to the CPU. Same with Load Line Calibration if you have that option. Otherwise you'll get vdroop, so at 1.4V you're running closer to 1.3 under load (as an example).
    January 18, 2012 2:38:51 AM

    I tried just to have turbo on all the time and sett all cores to 47x... it seemed more stable but after 1,5 hour prime it failed :( 

    My volt is 1,400 to 1,408v, using "ultra high" load line.
    January 18, 2012 1:26:28 PM

    I have to say tho (knock on wood) that it seems better now... After clocking with turbo (not the main reason) and upping the Vrm and stuff i haven't had any problems with gpu. Maybe a bit early to say tho...

    I was also hoping to be prime stable, but after 1,5 hour i got the 124 bsod yesterday. i don't really think i will notice anything while gaming tho, so no biggy. Maybe upping the vccio would make it a bit more stable tho.... i'll try.

    Edit: After testing 2 days now i have yet to have any problems with the gpu :)  May be just random luck, but i have played and tested a lot + many restarts. Also noticed that with vccio at auto, not 1,125v or 1,15v the computer is more stable. Got further and futher in prime with less vccio :) 
    January 19, 2012 3:56:18 PM

    Okay, now i'm REALLY confused. The computer has been flawless the last 2-3 days, gpu problems was completely gone. Played a lot and all good. And i tried to get 4,8ghz at a bit more volt which it didn't like, so i got a bsod while sleeping... i restart det computer and set everything back to the 4,7ghz prime stable setting i have saved. And studdenly the gpu problem again...

    So i load optimized settings in bios, restart, then set the 4,7ghz prime stable settings on again and now its fine...what ? (just fine now that i tried some benches, we'll see later if its fine.) I'm not understanding *** now, lol...maybe i should just never turn the computer off...lol
    a c 100 K Overclocking
    January 19, 2012 5:02:45 PM

    Just sounds like when you went for 4.8ghz it was a bad OC and destabilized the system. Something must have stuck in the BIOS until you reset it to defaults and then reapplied the 4.7ghz stable OC.

    Think about it, though. What purpose does it serve to get your CPU higher? I'd say for trying to get a really high benchmark score, and that is all. It won't improve anything else, really, because bottlenecks are going to be everywhere except the CPU.

    Basically, go for the big OC if you want, I know how it feels to have the bug, but I think it's time you realize that it's good where you are :) 
    January 19, 2012 5:11:05 PM

    wolfram23 said:
    Just sounds like when you went for 4.8ghz it was a bad OC and destabilized the system. Something must have stuck in the BIOS until you reset it to defaults and then reapplied the 4.7ghz stable OC.

    Think about it, though. What purpose does it serve to get your CPU higher? I'd say for trying to get a really high benchmark score, and that is all. It won't improve anything else, really, because bottlenecks are going to be everywhere except the CPU.

    Basically, go for the big OC if you want, I know how it feels to have the bug, but I think it's time you realize that it's good where you are :) 


    Hehe, ye you speak the truth :)  I'm more than happy with 4,7ghz. Honestly i don't need that much either, just would like to find out why this happens. Going from my old e8600 to this 2500k was a insane bettering of my computer, i suddenly had 2 times the frames in games. With the old e8600 i needed as much mhz as possible to get anything out of things, it was a insane bottleneck. With the new cpu i have almost the same gpu scores in benches and games with stock mhz. With the old cpu running at 4,5ghz, this is still faster by a mile at stock :D 

    However, if the bad oc destabilized the system or/and stuck something in the bios, i wouldn't suddenly have gpu problems after a while in windows without restarting. I can try again and see if the computer stays like it should after some days without restarting...
    a c 100 K Overclocking
    January 19, 2012 6:05:19 PM

    Well I'm still thinking it has to do with some sort of issue of the CPU communicating to the IMC or something. On 1156 and 1366 sockets, you'd want to increase the IMC/VTT/QPI voltage a bit, but with 1155 you don't really change anything but the multiplier so it *shouldn't* matter.

    I'd say just try tweaking different settings, voltages, etc, and see if something works if you want to keep trying high clocks. That's kind of the thing with OCing, it's easy to get a little, it's hard to get a lot, and it's mind boggling to try and push the limits.
    January 21, 2012 2:58:43 PM

    Even more confused again now, everything has been good for 2 days again, been playing a lot, doing some benchmarks and watched series. Suddenly while i was in the shower now it did a 124 bsod again, when just idling normally. Been stable as hell the 2 days.... this is the same as before....
    a b K Overclocking
    January 21, 2012 5:10:44 PM

    I have noticed that when OC'n my 2500k when it crashed it would currupt the video drivers which gave me all sorts of confusing problems.

    I just got to the point when I had an unsucessful OC I'd uninstall then reinstall my video drivers and that helped me a lot.

    Just as a side note; is your incoming A/C line stable? I live in a remote location and have intermittant power failures so got I me a UPS to protect my PC. :sol: 
    January 22, 2012 12:07:37 AM

    Ye, line stable as it can be up here. I read something about needing to have the c3/c6 report on auto or enabled with thsi chip and stuff, guess i'll try that :S
    January 26, 2012 5:31:15 PM

    ottesen said:
    Ye, line stable as it can be up here. I read something about needing to have the c3/c6 report on auto or enabled with thsi chip and stuff, guess i'll try that :S



    Quoting my self like a baws ! Computer has been on since Saturday, so it seems much better now, no bsod or anything with the power saving stuff on. Even with the voltage manually set at 1,4v the cpu is much cooler... i thought that only voltage determent the temperature, but it doesn't seem that way...
    February 1, 2012 1:17:49 AM

    Good and bad news...

    Bad news is that my cpu waterblock has a little leak and i found that one hose is starting to get a leak since its rubbing on a bracket i made... (ordered new better ones now)

    The good news is that when i sat on spedstep/c1/c3/c6 stuff my computer is fine. Been on 24/7 10 days strait now without problems :)  The voltage is the same all the time but the mhz goes down due to the speedstep, its actually much colder also. So really good stuff :) 
    February 3, 2012 11:54:39 PM

    Lol, confused again...as normal. Computer has been stable and been perfect many days now, did a 8 hour + prime without problem and been playing and messing around. Also changed the leaking cpu block.

    But today i tried to do some benchmarks at 5ghz, all good. But as soon as i did i little gpu overclock (very small) it restarted it self. And after that i suddenly get bsod 116 again and it just restarts...lol...what ? Maybe its just that my gpu is a bit bad/crazy ?

    Edit: First i couldn't get tru a whole benchmark before i could see fps dropping, and then i change a random thing i bios and restart and i got a bit better. Going stuff like that many times makes it better and better, now its back where it should and the benchmarks gets better every time... any smart ideas why ? 30 min ago i could go one benchmarks and have like 170fps at one point, next bench i could have 120 on same place, not its stable again... lol.
    February 4, 2012 10:13:55 PM

    I still need some help with this one, so strange....

    1: Pc is stable, +8 hours prime stable and been on strait 10 days with gaming,surfing and idling.
    2: I change multiplier from 47 to 50 and up the cpu volt and do benchmarks... Change nothing else.
    3: When i change stuff back i get a big big fps drop in games and can suddenly get bsod 116 in benchmarks.
    4: I restart and pc gets better and better, get less bsod and fps drops. Seems also to help just to change random stuff in bios.

    I thing its been like this since day one, first when i got this mobo/ram/cpu i though i'd overclocked it wrong. But everything seems so random. When the problems come i get like 120-130fps where i normally get 170. I first though it was for instance vccio to low or something but at stock/auto it SEEMED best, now i think its just random. Feels like the bios have to get used to or learn the settings, since everything now is exactly the same as it was when it was super stable. Also noticed a little decrease in gpu score on tests now...

    And everytime i try to fix this it get better and better, even tho i just go in the bios changing the startup picture on and off... woot ? Any thoughts ? :bounce: 
    a b K Overclocking
    February 4, 2012 10:40:49 PM

    Did you ever think that you are simply pushing your rig too far (in your OCing efforts)? Seriously, read back through your thread and then ask yourself what I just did. Just something to think about, my friend.
    February 4, 2012 11:28:31 PM

    COLGeek said:
    Did you ever think that you are simply pushing your rig too far (in your OCing efforts)? Seriously, read back through your thread and then ask yourself what I just did. Just something to think about, my friend.


    Hey :) 

    Ye, the though has crossed me, and i'm pretty sure i haven't pushed it to far. I wouldn't consider have my 2500k at 1,4v and 4,7ghz far at all. I kinda have/got the feeling that the bios is messing with my settings. I also got a mate with the same parts experiencing somewhat of the same problems. The thing is that its suddenly fine, working as it should and if i then change anything in the bios it gets messed up. (even tho i change something un-relevant) It all could be so simple that my graphics card is a bit bad...

    I tried something now, just put everything in bios back to stock, then i manually changed all settings back to my 4,7ghz overclock... we'll see if that makes a difference.
    a b K Overclocking
    February 5, 2012 2:07:36 PM

    Could you give us a link to the exact ram you are using?

    How much and how many sticks of ram?

    Are you using WIN 7? 32 bit or 64 bit.

    Since you are water cooling it is important to have good air flow over your power MSFETs for your CPU. If they start to over heat due to OC'n your CPU will see unstable voltages. Of course this will vary according to your load.

    I water cool myself and have a fan blowing right on my MSFETs to keep them cool. Some of that air also blowes across my ram as well.

    When I run P95 I start with small ftts, then use the blend test as that incorperates the ram as my final okay for my OC.
    February 5, 2012 2:39:48 PM

    arthurh said:
    Could you give us a link to the exact ram you are using?

    How much and how many sticks of ram?

    Are you using WIN 7? 32 bit or 64 bit.

    Since you are water cooling it is important to have good air flow over your power MSFETs for your CPU. If they start to over heat due to OC'n your CPU will see unstable voltages. Of course this will vary according to your load.

    I water cool myself and have a fan blowing right on my MSFETs to keep them cool. Some of that air also blowes across my ram as well.

    When I run P95 I start with small ftts, then use the blend test as that incorperates the ram as my final okay for my OC.



    Sure thing man :) 

    Ram is Corsair Dominator DHX DDR3 1600MHz 8GB ( http://www.corsair.com/cmp8gx3m2a1600c9.html ) 2x4gb sticks

    Using win7 64 bit...

    I see your point but if the MSFETs or something was unstable it wouldn't manage prime just fine. It computer seems fine now after i manually set every setting back to my 4,7ghz overclock, its almost like the bios needs med to start from scratch every time...
    a b K Overclocking
    February 5, 2012 3:14:55 PM

    Well if you can not get stable past 4.7GHz then something is going on.

    I suspect that your cooling is not up to the task. Just my opinion. :sol: 
    February 5, 2012 3:35:38 PM

    arthurh said:
    Well if you can not get stable past 4.7GHz then something is going on.

    I suspect that your cooling is not up to the task. Just my opinion. :sol: 



    Its a fairly huge and good case with good air flow and a pretty big single water loop to the cpu (2x240rads with 4 fans + 4 fans in the case). Thing is that its almost always stable on prime and such, it is always something to do with the gpu. As mentioned i get bsod 116 when the problem come, and thats a typical gpu thing. (or NB thing with older mobos)

    The thing is that now its been perfect all day, after i had everything back to stock and then manually put settings back to my overclock on 4,7ghz its fine. And this is the exact same settings that it both was messing with me AND when it was stable. Every setting is exactly the same. Even stranger is that when i get the gpu problems it gets better and better almost every time i restart...lol. I'm almost having the feeling that the bios isn't letting all the settings go/change, thats why i tried to just manually set everything back to my old overclock settings.

    And i appreciate your and everybody's advice/tips and tricks :)  I'll see after some days if its fine or messing with me again, seems pretty good now :) 
    a c 100 K Overclocking
    February 5, 2012 4:31:18 PM

    There's no real reason why the CPU would be able to go past 4.7ghz. Not all CPUs are created equally, after all. I mean my CPU is great at 4ghz. 4.1 takes quite a bit more juice. I had it at 4.3 once and it wasn't stable with a TON of voltage although I think I did get a run of 3D Mark in before a BSOD. So only 300mhz goes from rock stable to huge voltages and still not stable.

    Only people with very good chips can push 5ghz.
    February 5, 2012 5:01:36 PM

    wolfram23 said:
    There's no real reason why the CPU would be able to go past 4.7ghz. Not all CPUs are created equally, after all. I mean my CPU is great at 4ghz. 4.1 takes quite a bit more juice. I had it at 4.3 once and it wasn't stable with a TON of voltage although I think I did get a run of 3D Mark in before a BSOD. So only 300mhz goes from rock stable to huge voltages and still not stable.

    Only people with very good chips can push 5ghz.


    Ye, but thats not the problem here. And i find 4,7ghz pretty low, not high. If you have the same chip or 2600k and its unstable at 4,3 then there is something wrong or you are going something wrong. My problem isn't that it doesn't go higher, its the gpu problems coming sometimes. Like now its all fine, but why ? It was stable, then i changed something in bios, then changed back = suddenly gpu problems again. Now i have the exact same settings and its all good.

    If you needed a ton of voltage to get to 4,3ghz then there is something really really wrong, even with the worst chips (2500k-2600k) i've never seen really high voltage at 4,5ghz even. I needed a big voltage to get mine to 5,2ghz but thats not so strange... And you don't need a very good chip to get 5ghz, even with a moderat og half bad one that should be done quite eazy. (for benching that is and not thinking 24 hour prime stable)
    a c 231 K Overclocking
    February 5, 2012 6:29:09 PM

    This topic has been closed by 4ryan6
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