Recommendations for e8400 overclock

rbk88

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I just did my first overclock and I wanted to make sure everything looked okay and stable. Here are my stats:

E8400
Gigabyte EP45-UD3L

CPU-Z INFO
Stepping: A
Revision : E0
Voltage: 1.168 V


Temps from real temp:
Idle: 41C 38C
Load : 57C 57C

Prime95 tested for load and stability

PCI-E Frequency set at 100mhz
FSB = 400 (400 x 9 = 3.6 ghz)
System memory multiplier : 2.66D
Ram rated at 1066, running at 1066

Core voltage that it had originally was set at "auto" and had 1.300 V
I set the voltage at 1.225V and ran the prime 95 tests


I ran prime 95 for about an hour, no problems so far and it seems fine. I also turned the stepping back on (which lowers the system multiplier when the cpu is not heavily used). Is there anything I should change? Any recommendations? Changes? Again this is my first one so I want to make sure those temps and settings are all ok. Thanks!!
 

ragsters

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The load temps seem a little high but nothing to worry about. What is the VID that real temp tells you? I think your vcore might be a little low. 1 hour of prime 95 is definately not long enough to see if your cpu is stable. I would run Linx for about 25 passes to check to see if your voltages are enough and then run prime 95 blend test for 6-8 hours. Here are the links.
http://www.xtremesystems.org/forums/showpost.php?p=3716812&postcount=341

Open it with this.
http://www.7-zip.org/
 

rbk88

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Ok so I actually just updated my BIOS, which I didn't know took away all my settings back to standard. When I put all my info from above back in, the computer wouldn't book. I then added some Vcore, changing it to 1.250V and now it has booted. So I will run prime 95 again and see if it is stable. What is VID? I don't see it anywhere on the real temps app.
 

g3force

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It's possible in some instances to run an E8400 at 3.6 Ghz on stock voltages. His voltage isn't low IMO, though a thorough P95 test is the only way to prove this.

To the OP: Are you using the stock cooler or an aftermarket one? Your temps are OK right now, but pushing your overclock further will put your temperatures to the "safe" limit. The general opinion is that 65C is the E8400's safe temperature limit, but IMO, 60C is the temperature you do not want to exceed. Again, this is an opinion, not a fact.

Try lowering the voltage by small increments and run P95 for 12-24 hours to find the lowest voltage you can run your CPU without giving errors.
Other then that, there isn't much to say. Good luck, and have fun with your OC'ed chip!
 

ragsters

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"It's possible in some instances to run an E8400 at 3.6 Ghz on stock voltages. His voltage isn't low IMO, though a thorough P95 test is the only way to prove this".

How do you know what his stock voltages are? Auto gave him a voltage of 1.30V which is pretty high. This is the reason why I asked him what real temp shows as the VID for his cpu. Some processors have a higher VID so require a higher voltage for it to run stable at stock clocks. Also I have an e8400 E0 stepping with a VID of 1.3V and I have to set my voltage at 1.275V [cpuz reads 1.25 idle] to run it at 3.6Ghz.
 

ragsters

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Check VID under settings. It will give you a min. and max. The number you need is the max. Also, core temp will show it to you.
 

rbk88

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Yes I am using a stock cooler and I DO NOT plan to go above 3.6 ghz. So RIGHT NOW I am currently running prime 95 again. Like I mentioned in my 2nd post I changed the Corevoltage to 1.250V. It seems the absolute maximum my cpu temp has hit so far has been 59C but hovers at around 57C during the prime 95 test. Ragsters, the VID min is 1.1V and the max is 1.3V. I have no idea what those numbers mean.


Also, what is your opinion on the two stepping functions that I have enabled in the bios (the one where it lowers the multiplier when cpu is not in heavy use?). I beleive these are enabled by default.
 

g3force

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I believe the stock voltage is 1.15 volts. That's what I'm referring to when I say "stock voltage", not the voltage to BIOS applies when set to auto. Considering he has the newer E0 stepping, it is possible, but not guaranteed, to run it at 3.6 GHZ on that voltage.
 

rbk88

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Well like I said in my 2nd post, I set the voltage to 1.225V after that bios update and my computer wouldn't boot, so I'm guessing it's not enough...running prime 95 now at 1.250 V.

CPU-Z is reporting core voltage at 1.200V
 

ragsters

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Don't listen to g3force. Everything he is saying is "I believe" with out having any links or proof to back it up. Where did you get 1.15V anyway that number is pretty random.
 

g3force

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Thats true, though I find it odd that it won't boot on the previous voltage with a BIOS revision. But as long as the temperature doesn't become notoriously high, this shouldn't be an issue.
 

g3force

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Don't flame... I can back up this with my own BIOS and P95 screens... That tone is uncalled for..
 

rbk88

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Hey guys take it easy, it's cool haha

So I'll run Prime95 for as long as I can and if I don't get any errors it should be good to go? If you were me, would you then start to slowly lower the voltages little by little and test again and again until prime fails?

It's also really wierd it seems the temps keep falling the longer I've run this prime95 test. It's at 53C now at full load
 

ragsters

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All I am saying is that every processor is different and that you can't tell someone that there cpu has a certain stock voltage when one could be different than another.
 

ragsters

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Ideally what you want to do is start at a low Voltage and raise it until it passes. Also make sure you have error checking enabled or prime 95 won't tell you if you have an error.
 

rbk88

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Oh ok...I think I'll go change the voltage lower than and see if it boots. Sorry for being so new to this but where is error checking? I can't find that option
 

ragsters

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Go to the advanced tab and then check/enable round off checking.
 

rbk88

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thanks a lot. I will do that. Ok this is so wierd. Now I just set the Vcore to 1.200V and it booted just fine. So I'll try setting it even lower and running prime95.
 

g3force

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I was trying to get that message across, but after reading my previous posts, it seems that I was pointing in a completely opposite direction :non:. My apologies for that, I should have re-read my messages thoroughly before posting (and when I'm more awake!) I will take this into consideration in future :)
 

rbk88

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Ok so after playing around with the voltages (computer would not boot), I think I settled on 1.1875V. Running prime 95 now.
 

ragsters

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Dude, finally someone who knows what I am talking about. If I were you rbk88 I would listen to eagles453809 and I. He said exactly what I have been saying from the beginning.
 

rbk88

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So my voltage is at 1.200 V and it seems stable. I ran P95 for over 2 hours with no errors. I think I'll use this for now and hope nothing happens :)

I do have the C1E and Eist on....do you guys keep those on as well?
 

ragsters

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Most people who overclock turn this off because the system seems to be more stable. This doesn't mean you have to. If you get an overclock you like stable with EIST on than great.