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Need help on OC E8400 P5Q premium

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October 14, 2008 7:16:35 PM

I am a total noob on building and OCing. Here is my spec and I ran Prime95 for 1 hour with no problem so far but the problem is the temperature is really high with core temp (highest is getting to mid 70s) tried lowering the CPU voltage but fail really fast. Any suggestion? Thanks for all your help in advance!


Lian-Li PC-A05B ATX Black Aluminium Mid Tower Chassis

Antec Neo Power Blue 650 Watts Modular 80+ Certified Energy Efficient SLI/Crossfire Ready Power Supply

Intel Core 2 Duo E8400

Asus Silent Square Pro Adjustable CPU Cooler with front fan speed display and control Knob

Asus P5Q Premium ATX Cross Fire Ready Motherboard with onboard EPU

ATI Diamond HD 4850 512MB PCIE 16X Video Card

OCZ Flex XLC 2GB DDR2 1150MHZ

CPU Ratio Setting: 9
FSB Frequency: 423
PCIE Frequency: 100
FSB Strap to NorthBridge: Auto
DRAM Frequency: DDR2-1127MHz

CPU Voltage: 1.34375
FSB Termination Voltage: Auto
DRAM Voltage: 2.10
NB Voltage: Auto
SB Voltage: Auto

More about : e8400 p5q premium

October 14, 2008 9:47:28 PM

Hi Wingedemoon,

Read these 2 stickies:

OC Guide: http://www.tomshardware.com/forum/240001-29-howto-overc...

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

Get speed fan and calibrate it so you know your Tcase temp. Unfortunately the only published max temp is the Tcase (core temperature readings are for tjunction). The e8400 Tcase max temps are 74c (e0 stepping) 71c (c0 stepping).

As for your settings. It looks like you have an awfully high vcore for that clock speed. With my e0 stepping e8400 I was able to hit 3.8ghz on stock vcore and was at 1.2something. I didn't have to start bumping vcore till I went for 4.0ghz (444x9) and even at that OC it was a very minor voltage bump. But your high temps are being caused by that vcore which is fast approaching Intel's specification of 1.3625v.

Something else to consider is that your video card puts out a TON of heat, and if you don't have good case cooling (at least 2 or 3 120mm intake/exhaust fans) your interior is probably roasting and causing the cpu to run hotter than it needs to.

So for starters, what stepping do you have? Try dropping your vcore to 1.265 and see if you are stable in prime small fft for at least 4 hours. If not, bump it 1 increment at a time until you get that kind of stability.
October 14, 2008 10:00:57 PM

Yeah I just checked out your case on newegg, and it looks like the cooling system on that thing sucks big time. Sorry to be blunt, but that's not helping you. The easiest and cheapest solution would be installing 1 or 2 pci slot blowers. Short of modding the case to put another fan or two on it, I don't see much way of improving your ventillation. If you decide to mod the case so you can install some more fans, I'd suggest using the side panel (if it comes off). You could drill a bunch of holes in the side and install 1 or 2 120mm intake fans. Main danger of modding the case is you want to be sure that no metal shavings get anywhere near your components. Hence why I suggest the side panel if it comes completely off.
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a b K Overclocking
October 15, 2008 1:18:15 AM

you have a dud chip...

you have to, thats simply way to much voltage for that chip,

I get 3.85 ghz STABLE for 24 hours in prime95 on a quad core... at 1.25 volts

your volts are simply too high for that speed, to stabilize change NB voltage to 1.5, at minimum and see if that increases stability

also set your...

nvm I found a thread that seems pretty useful... and its a New-B so its good to know there are a couple non noobs :D 

http://www.tomshardware.com/forum/249271-29-e8400-quasi...
October 15, 2008 2:06:14 AM

lol thogrom. That's my thread :)  and it pretty well documents all the steps I took. :sol: 
October 15, 2008 5:03:11 PM

Thanks for all the info guys.

As far as my Stepping I think I have a C0...

And I am guessing my chip is a dud too... :( 

What should I do??? Will it makes a different if I change the NB and SB Voltage? and read something about VCC... wonder what it does?

Thanks again for the help!
October 15, 2008 5:42:55 PM

Also, is it my CPU problem or my mobo? With everything in Auto setting... the Vcore is only 1.17 loaded....
October 15, 2008 7:04:24 PM

You have to remember that only 50% of the e8400s hit 4GHz at 1.4v or less. You are at 3.8GHz which is still plenty fast. Can you try adjusting your fan to max? If you want 4GHz at 1.2v, you are gonna need an e8600. Those are Intel's highest bin and im seeing people hit 4.5GHz at 1.3v to 1.4v :)  Hope this helps.
October 15, 2008 7:10:06 PM

I am fine on 3.8 but my concern is mainly the Temp. That's pretty hot even with a aftermarket fan... and my Vcore is pretty high compare to most people I think....
October 15, 2008 8:07:23 PM

Also, I dont know if it is my fan too... everything stock setting i get like 60sC when running p95. And it should be in Max fan speed as I can adjust it from the outside of my PC and it is 100% on the nob with 2220rpm speed.
October 16, 2008 5:16:01 AM

Just did another OCCT test and find out a problem. Idle @ 48C and load @ 63C highest even even thing is at stock setting.... :(  Vcore is 1.17

How can this happen? I assume is a really bad chip or is it some other problem?

Thanks for the help in advance!
October 16, 2008 8:27:04 PM

My e8400 (e0) hit 444x9 at 1.25v vcore and that's all I changed

If you are hitting high 40s idle and low 60s loaded at stock settings, you probably should try reseating your heatsink. But before you do that, try running the prime 95 at stock settings with the side panel off and a fan blowing on your open comp--that is if you haven't already don this. That will tell you if your case cooling is causing you problems or if you need to reseat the heatsink.

a b K Overclocking
October 16, 2008 9:02:46 PM

just whack it up to 1.6v like me its fine, im stable at 4.6ghz. seriously dont put above 1.4v unless you have cash for new cpu. if its still not stable at a decent voltage try altering the pll and fsb term(vtt) voltages. google whats the safe limits i cant be botherd to do it for you.
October 16, 2008 11:28:39 PM

This is so confusing!!!! I would love to pay someone to get it done for me sometime!!! lol

I really hope is the heatsink, and the messed up part is... I am such a noob and I cant even pull my heatsink out!!! Grrrrr
a b K Overclocking
October 17, 2008 7:54:02 AM

i wish i could earn a living overclocking but like always you only get payed if you break the equipment not on how stable it is :p . if you live near the leeds area i could pop in and have a look for you i wouldnt chage anything except petrol.
October 17, 2008 11:44:20 PM

wingedmoon said:
This is so confusing!!!! I would love to pay someone to get it done for me sometime!!! lol

I really hope is the heatsink, and the messed up part is... I am such a noob and I cant even pull my heatsink out!!! Grrrrr


The BIOS' to these P5Qs are a little quirky...I find it most stable when things are on "auto." Also try reseatting your heatsink. Does it pass 3.8 with lower vcore?
October 18, 2008 5:59:31 AM

Thanks for all you guys help!

I gave up on that chip and swapped it out to a E8500... lol

So far I am getting 4GHz with Vcore set on Auto and cpu-z show 1.34v with Auto setting.

I guess my heatsink were part of the problem, now with the E8500 i am getting low 40s idle and mid 60s when load with OCCT test. you guys think I have more room to push? :p 
October 18, 2008 6:02:44 AM

BTW, I used 1 whole AS 5 Thermal Compound. I really think that helps! $8 well spent!
a b K Overclocking
October 18, 2008 1:01:41 PM

you used the whole tube? thats good for about 10 applications.
October 18, 2008 5:38:09 PM

yeah lol you probably have AS5 all over your mobo now :??: 
a b K Overclocking
October 18, 2008 5:41:03 PM

yea lol i got alot of dielectric grease over mine but thats to stop ice forming under cpu.
!