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E8400 OC

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October 10, 2008 5:16:56 PM

hi

so i oc'ed my E8400 to 3.3ghz (fsb=363mhz if im not mistaken)

i was wondering what would you call a sweet spot for this CPU, in terms of not going on extreme overclock. what i mean is, i don't intend to use an aftermarket cooler, so how far can the OC go on the stock cooler without losing stability?

i used RealTemp and played half an hour of the newest BIA game, max temp was 57ºC. time to stop or can i go up another notch?

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a b à CPUs
a b K Overclocking
October 10, 2008 5:26:39 PM

umm they say over 70c its bad

aftermaket heatsinks dont cost fortune and then you can reach 3.6-4.0ghz....maybe ask santa for one for upcoming christmas :p 
October 10, 2008 5:35:13 PM

uh, don't just play a game to test temps and stability. Download prime95 and run it for 8+ hours to insure full stability. This will stress your cpu and give you your maximum temperature. As for how far you can go, you wont be able to achieve a high overclock with the stock cooler due to temp restrictions. I like to keep my processor around 65 at full load, absolutely no higher then 70.

If you want to get a good overclock out of your cpu then you will have to get an aftermarket cooler. Thats just the way these things go.
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October 10, 2008 5:40:56 PM

My E8400 has been at 400MHzX9 since I bought it the week they came out. Temps idle in the mid 30s and Prime 95 torture tests max out at 61C. But that is all with an Arctic Cooler 7 Pro. On the stock cooler I think you have made some pretty nice gains there! You could push it a little further (70C stated above) but on stock, I would be really happy if I got where you were.
October 10, 2008 5:45:16 PM

just make sure that you aren't using a game to test for stability, use Prime95. Not only will it give you higher temps, it will (more importantly) be testing the cpu to make sure that it is stable.
October 10, 2008 6:30:12 PM

ALSO, make sure you understand which temp you are looking at.

If I recall correctly the tCase max for the e8400 is 105C yet at least one of the temp monitoring utilities (can't remember if it's realtemp or coretemp) has the tCASE set to 95, and all the temps it displays are 10 degrees out.

I overclocked my e8400 the week it came out, so I can't remember all the details....
October 10, 2008 6:36:24 PM

make sure the tjunction max is set for 105 in real temp (although i think it come configured correctly, it doesn't hurt to check)
October 10, 2008 6:52:58 PM

WEll you would be safe at 3.4 as long as temps dont go over 70c during prime.

Your silly not to spend a little extra for a good cooler with overclocking pn your mind.

I bought my e8400 C0 with a http://www.newegg.com/Product/Product.aspx?Item=N82E168...

and it is running 450x 9 @ 4.0 My idle temps are 29c, and my load temps on prime are 54c. This cooler cools my cpu 15c cooler then my friends at the same settings, and he has a $300 water cooler.
October 10, 2008 7:10:42 PM

kyeana is correct. It's the tjunction that has a max of 105c (the temp measured at the core) whilst tcase (the temperature on the shell of the cpu) should not exceed 72C
a b à CPUs
October 10, 2008 7:18:22 PM

roadrunner197069 said:
WEll you would be safe at 3.4 as long as temps dont go over 70c during prime.

Your silly not to spend a little extra for a good cooler with overclocking pn your mind.

I bought my e8400 C0 with a http://www.newegg.com/Product/Product.aspx?Item=N82E168...

and it is running 450x 9 @ 4.0 My idle temps are 29c, and my load temps on prime are 54c. This cooler cools my cpu 15c cooler then my friends at the same settings, and he has a $300 water cooler.


What mobo are you using?
October 10, 2008 7:56:48 PM

1- just pushed the FSB up to 374mhz, so it's at 3.35ghz now. im not gonna risk going any higher with the stock cooler so i'll let it stay like this. maybe down it to 370mhz just to be a little safer.

2- i wouldn't mind getting a cooler, but for reasons i don't really wanna share (no offense) i won't be doing that for quite a while. maybe in a year...
October 10, 2008 8:14:18 PM

I thought that the Tjmax for e8400 was 100c
October 10, 2008 8:20:29 PM

chunkymonster said:
What mobo are you using?

Asus P5Q
a b à CPUs
a b K Overclocking
October 10, 2008 8:21:35 PM

E8x00: Tcase Max 74c, Stepping E0, TDP 65W, Idle 8W
E7x00: Tcase Max 74c, Stepping M0,TDP 65W, Idle 8W
E5200: Tcase Max 74c, Stepping M0,TDP 65W, Idle 8W
E4700: Tcase Max 73c, Stepping G0, TDP 65W, Idle 8W
E4x00: Tcase Max 73c, Stepping M0, TDP 65W, Idle 8W
E2xx0: Tcase Max 73c, Stepping M0, TDP 65W, Idle 8W
E8600: Tcase Max 72c, Stepping E0, TDP 65W, Idle 8W
E8xx0: Tcase Max 72c, Stepping C0, TDP 65W, Idle 8W
E6x50: Tcase Max 72c, Stepping G0, TDP 65W, Idle 8W
E6540: Tcase Max 72c, Stepping G0, TDP 65W, Idle 8W

http://www.tomshardware.com/forum/221745-29-core-quad-t...

Btw, RealTemp is correct.
October 10, 2008 8:43:02 PM

Deadstar said:
1- just pushed the FSB up to 374mhz, so it's at 3.35ghz now. im not gonna risk going any higher with the stock cooler so i'll let it stay like this. maybe down it to 370mhz just to be a little safer.



Did you test to make sure it was Prime95 stable? or did it just boot into windows ok?
October 10, 2008 8:46:18 PM

for now just booted okay and tried a game for a while, im gonna go out for the night now but tomorrow i'll download Prime95 and give it a shot and i'll post again with the results.
October 10, 2008 8:54:25 PM

sounds good. Just record what your temps get to and make sure that prime95 can run for 8 or so hours without getting an error. If that works then you have a dead stable overclock.

Cheers :) 
October 12, 2008 4:20:53 AM

I have an e8400 (e0 stepping) paired with a DfI DK X38 t2rb mobo. I've gotten it stable in prime for 10+ hours at 4.19ghz (466x9) and prime stable for 1hr (when I stopped it) at 4.26ghz (474x9). Though by then I was getting close to Intel's stated limit for vcore for the wolfdales: 1.3625v (do not exceed this voltage unless you have serious cooling and are willing to risk killing your cpu). I was using a Thermaltake Big Typhoon cooler. At the highest OC I was hitting 62c tcase.

I was also able to hit 3.8ghz while only upping FSB and keeping ram speeds low (aka no voltage bump and setting ram to 667 isntead of 800 spead).

A couple things to consider when you OC, 1) how high do you want to go? if you are thinking of 4+ ghz you will probably want to get DDR 2 1066 ram or you will need very good ddr 2 800 ram that has a high OC potential. Otherwise ram will get in your way. Also, the higher you go, the more you have to increase voltage, and heat increases exponentially with voltage increase. 2) If you are looking for a modest OC while maintaining some of Intel's nifty power saving features, I suggest going for no higher than 4.0ghz. I found that above 4.0ghz I had to disable the power saving features in order to maintain stability. Also your chip will like you more and probably last longer with a lower OC since you won't be pushing it so hard.

Incedentally, best prime95 test for cpu stability is the small fft.

Happy OC'ing and don't hesitate to ask more questions when you have them.
October 12, 2008 12:00:14 PM

hey

i haven't been around, i was gonna test it after downgrading to a lower OC for the first test (it's at 345mhz fsb right now), when i noticed something weird

when the CPU goes into high load, the temperature readings say the CPU is at 123ºC ! when that happens, it just gets stuck there, even at idle it says that.

safe to say the sensor might be screwed up?

a b à CPUs
a b K Overclocking
October 12, 2008 1:26:59 PM

^Yeah, looks like sensors are dead. Try the "Test Sensor' in RealTemp.
October 12, 2008 1:53:37 PM

Deadstar said:


when the CPU goes into high load, the temperature readings say the CPU is at 123ºC ! when that happens, it just gets stuck there, even at idle it says that.

safe to say the sensor might be screwed up?


Did you try restarting pc? I had this with speedfan.. seems just software bug.
October 12, 2008 4:48:20 PM

Currently im prime 95 testing my 8400 (Xeon e3110 version) at 3.5ghz 389 fsb i think, on stock voltages and seems to be doing alright. my ram is corsair xms2 ddr800 overclocked to 1000mhz 5-5-5-15 timings (2.1v for ram as that is what is stated to run it as from corsair). temps for cores are hanging around 55C and 50 C respectively max using arctic freezer 7 pro, little to no increase from 3.38ghz. previously i ran my cpu at 3.38 ghz no problems at all for several months, now trying to see how much i can get without raising voltage and keeping power saving options on.

edit: my fan speed isnt even 100%. its 81% according to speedfan during this prim95 test. i have it set in bios to auto adjust once my cpu reaches a certain temp. occasionally during this prime 95 ill hear my cpu fan speed up a bit more but it wont last but a minute or 2 then go back down. on idle my fan is around 60%
!