One Core Failed in Prime95, What to do now?

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SkruDe

SkruDe

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Rig Specs:
-ASUS Rampage IV Extreme LGA 2011 X79 E-ATX Motherboard
-Intel i7-3930k CPU
-G.Skill Trident X Series 32GB (Timing: 7-8-8-24, Cas Latency 7) DDR3 1600MHz RAM
-(2x) Sapphire Radeon HD 7970 6GB Vapor-X Graphics cards in crossfire.
-XSPC Raystorm 750 RX240 Watercooling kit (with custom push/pull 4 fan configuration).
-(2x) Intel 520 Series 6GB/s SSD Hard Drives (120GB for OS, 180GB for programs).
-(2x) Western Digital 1TB Hard Drives (1 for Bulk Storage and 1 for back-ups).
-SeaSonic X-Series 1250W Power Supply
-CoolerMaster HAF-X Full Tower
-LITE-ON Blu-Ray Player/Burner (CD, DVD, Blu-Ray Read/Write).
-Windows 7 Professional
-AeroCool Touch 2100 Fan Controller
-Dual In-Line Phobya water temperature sensors with XSPC LED displays.



I have my CPU @ 4.3Ghz and my RAM @ 1600MHz

Vcore @1.295
VCCSA @ 1.250


Started Prime95 Torture Test, Blend mode.

Failed on Core 6 (Thread 11, Worker #11) within 5 minutes.


I just want to talk about this and figure out the next step. Is it simply raising the Vcore voltage another .01? Maybe up 1.305?

Something else need be checked?

My CPU core temps were right around ~55-60 degrees Celsius during the Prime95 testing.

Any advice would be appreciated. I am relatively new to overclocking and have gotten this far with help from forums and that nice SB-e guide.


EDIT: Thought I put this in the CPU overclock sub forum. Hope it's okay in the general forum.
 
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inzone

inzone

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I have the very same cpu and motherboard and when running the stress test and a core fails I will either drop the ghz a notch or add vcore, depending onwhere I'm going with the overclock. I would add the voltage. With the temps your getting you do have some room if adding the voltage raises the temps a little.
I took my 3930k up to 4.7ghz and it was stable but the temps were a little high so I dropped it to 4.5ghz and that's where I have it now and the temps are fine and perfectly stable. Since I use water cooling I was hoping to go higher then that but for some reason the temps didn't cooperate.
 
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SkruDe

SkruDe

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Hi inzone, thanks for the reply and I really like your avatar! The eye of Sauron!

As mentioned previously, I am new to the overclocking so trying to explore the world. I picked 4.3GHz as my first overclock benchmark to see how the CPU held up and how the process went. My ultimate goal would be just like you mentioned you have, right around 4.5 to 4.7 on my WC set-up.

I am overclocking at base clock of 100Mhz x 43 to get my 4.3 Ghz. In the ASUS BIOS I am using the "All Cores" option to OC all cores, instead of each individually.

Since 1 core (Core #6) failed early, I was thinking should I keep all cores the same as I am doing or do individuals? I think I rather do all the same for ease and especially given my experience right now in the matter.

So, I'll raise my Vcore from 1.295 up to 1.305 and try the Prime95 Blend test again and see what happens.

I'm wondering if I should just skip this step and go straight for 4.5GHz with more Vcore, or if it is better to start at 4.3 and work up? I guess just patience is the issue since it's 24 hour stress tests intervals at a time.

 
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inzone

inzone

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Since your new to overclocking it's sounding like you need to do more reading and research on what overclocking is and how to do it. There are no skipping steps and there are no just putting in random numbers to see how it works. You have some expensive computer parts there and at $560 the cpu is not something that you want to take chances with, unless you have so much money it doesn't matter when you have to buy a new processor because you fried the one you have.

Overclocking is a process and it's a step by step process that is going to take some time to do because what you want in the end is a stable, high performance overclock that is going to give you the same rock solid everyday reliability that you get from a stock running Pc , only at a high level.
The other thing you want to accomplish is to have this high clock speed at the lowest amount of voltage as possible so you don't shorten the life of the cpu. Adding voltage should only be done when necessary such as a stress test fail.
Since your at the 4.3ghz you now should be trying to get that to pass the stress test and that is all cores, you can't do the cores separately and it's either all or one core , and I'm sure you don't want to run just one core overclocked.
With just one core failing you can add one notch of voltage to see if it will pass, once you get this clock speed to pass then you can move on to 4.4ghz and get that to pass, then to the next clock speed and so on till you reach your target speed that you want to stay at. There are other adjustments that can be made in the bios to help with the overclock as well and that's where the reading and research comes in. There are even videos on youtube that can help with some information, I would watch some of those videos a few times to get an idea of what is happening when you overclock and what needs to take place.
 
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SkruDe

SkruDe

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Oh trust me I have done lots of research, reading, and watching for everything in the whole computer process from when I was picking my components to now having everything together, working, stable and ready to start over clocking.

These forums, primarily Tom's Hardware, has helped me tremendously being able to communicate with other people about issues, questions, or concerns during all these process and I certainly do appreciate all this help.

The new voltage I came up with wasn't just a random guess. I was purposely picking .010V increments to increase with. So an increase in voltage would mean the next step would be 1.305. I was just curious whether at this point I possibly may need to look into other things? Or no, just do incremental voltage increases first to see if it works?

As far as skipping 4.3 to 4.5, and try starting there. Yeah, I wasn't sure. It's not an issue starting at 4.3. I like doing things right the first time so I will. I can work myself up without a problem. Just again, wanted to talk out loud, post questions, and discuss it.

 
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inzone

inzone

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Ok , so just try to get 4.3 ghz stale and solid as that gives you the base for the next step. It would be so much easier if there were a chart that you could look at and say ok I want to run at 4.5ghz, what are the settings for that. Here's the problem , all processors are not exactly the same even though they are the same model with the same stock speed and the same TDP, there are minute differences that become magnified once you start the overclock and you and your friend next door could have the same model cpu but you will have a different overclock from him and you may be able to be stable at 4.8ghz while he may be stable at 4.9ghz. So you would not be able to copy his settings and expect to get the same thing.

Believe me you want to continue the way I suggested with the overclock , it's tedious and time consuming but in the end you'll have what you want and you won't have to worry about crashes and overheating and you'll be able to enjoy a higher performance for a long time.
There's one other word of caution and that is that with adding voltage to the processor you want to try and stay at or below 1.38v as going over that amount of voltage will affect the life of the processor by shortening it. If your not concerned about the life of the processor then you can use what voltage you want to achieve your target clock speed. I don't know that there is a chart that shows what the affect voltage has on the cpu and by how much it shortens the life of the cpu.
 
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SkruDe

SkruDe

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Got home from work and started going at it again. Prime95 Blend Torture Test

So today, Attempt #2 @ 1.305 VCore, and I failed on Core 4 (Thread/Worker #8) in 15 minutes.

Yesterday on attempt #1 with Vcore @ 1.295 I failed on Core 6 (Thread/Worker 11) in 5 minutes.

So after Attempt #2's fail today, I started up Attempt #3 right after. Vcore @ 1.310 and it has been going now successfully for 2.5 hours without errors. 21.5 hours left!!!
 
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inzone

inzone

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Along with adding voltage you should check out the DIG+Power Control option as that opens a whole page of adjustments that will aid in your overclock. You don't need to change everything but there are a few things in there that will help. You can look at page 3-10 of the owners manual.
 
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SkruDe

SkruDe

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Well, I had to abort my stress testing last night because of a bad line of thunder storms that came through my area. I didn't want to leave my computer on during the storms out of precaution. So I ended my stress testing after 5 hours or error free testing. Power didn't end up going off, but the storms were severe enough that it could have.

Anyways, I found a flaw in my system last night. For some reason my fan controller doesn't want to control two of my radiator fans I have connected to it with a Y 3-pin adapter. They work, but I'm not able to control them. Which is wierd because I have 4 total radiator fans, 2 push and 2 pull, and my 2 push fans work fine with the Y adapter and the fan controller but my 2 pull fans are not. Anyways, that's a topic for another sub forum. So before going any further, I need to take care of this issue.
 
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chankey007

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So what were the VCore and Clock value you ended up with? (stable)
 
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Godto

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in OC... stress test for 2,3 hour is a good indicator that it stable ... don't do 24 hours every time.

when you happy with a speed you want and seem stable ... this is the one you keep then do the long stress test.
few minor adjustment will happen. that always happen to me when i stop at the speed i want ... end up add in little more volt to my ram because in 5,6 hours of test they felt. and also this when i also try to lower the voltage and go increment of .005 some even .003

good luck
 
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