My first OC E8400 and i hit 4.0Ghz ,got some questions please!

[telefanatic]

Hello all! I have put together a machine last saturday now i just started overclocking E8400 and already at 3962mhz, well im running into some trouble i ran Orthos and its giving me an error in about 6 minutes. Error is
Test 3, 4000 Lucas-Lehmer iterations of M19374367 using 1024K FFT length.
FATAL ERROR: Final result was D4BC97A0, expected: D1045A66.
Hardware failure detected, consult stress.txt file.
Torture Test ran 6 minutes 40 seconds - 1 errors, 0 warnings.
Execution halted.


Now my question is what is wrong ? I have raised the voltage to 1.3 and CPUZ shows it as 1.328V , Bus Speed is at 440 and multi at 9x and my rated FSB is at 1761. My ram is at 1:1 ration at 880mhz clocks are 5 5 5 15 its PC2-8000 OCZ Platinums voltage set at 2.15V

Also my temps are at 44C idle?

Here is my complete specs, E8400 , DFI LanParty LT X38 T2R motherboard, Thermalright Ultra 120 Extreme cooler, OCZ 4 GB (2X2GB) PC2-8000 1000mhz ram, PC Power and Cooling 750W PSU, Thermaltake Armor case , Corsair memory cooler, Sapphire 3870X2 in crossfire (well not till march waiting for drivers)

Also what is CPU VTT Voltage because that is set to 1.1V or something like that, i have raised the CPU VID Control to 1.3V and thats what CPU Z shows as 1.328, also CPU VID Special Add is set to auto and NB Core Voltage is set to the minimum.

 

[Markfw]

with bus@440, you probably need to up the fsb termination voltage. I am not sure what the bios for that motherboard labels that.

 

[telefanatic]

If this helps here is the link to this motherboard http://www.motherboardpro.com/...ket-775-ATX-p-405.html

Also 1.3V is not that high for Voltage for that kind of OC right ? Im just little worried and want to make sure its fine.

 

[Markfw]

I am not an expert at that chip, but I have read that if you stay under 1.4, AND the temps are fine, that you are OK. I am sure other experts will post here, but your FSB termination voltage is probably the culprit, and maybe the GMH also.

 

[Anubis]

up the NB voltage a lil

 

[Tempered81]

I would try to help, but that dfi mobo has so many overclocking options it tends to confuse people. I'm glad its not like normal, fast or fastest. But like 20 submenus of different voltage settings is uncalled for.

 

[telefanatic]

Originally posted by: Markfw900
I am not an expert at that chip, but I have read that if you stay under 1.4, AND the temps are fine, that you are OK. I am sure other experts will post here, but your FSB termination voltage is probably the culprit, and maybe the GMH also.

What is the GMH ? Also what would the FSB Termination voltage be under ? Because there is so many different options in the BIOS for voltages its really confusing.

 

[Tempered81]

G(mch) = northbridge = NB = Chipset for controlling memory bus = NB volts.

its the biggest heatsink on your board. He means increasing the voltage to that chipset to facilitate ease in handling overclocked Vdimm and Vcore

 

[telefanatic]

I upped the NB Voltage a notch and still Orhos fails in under two minutes now.

 

[GuitarDaddy]

You will most likely have to increase the vcore above 1.3 to get stable at 4ghz.

In my experience there can be a full .1v or more difference between "bootable" and "orthos stable"

 

[Tempered81]

well your issue seems strange, i would consult dfi overclockers. search for a guide for your specific motherboard. AFAIK, DFI mobos are the most capable, yet the most complicated.

 

[harpoon84]

I think it's a Vcore issue. From experience, failing Orthos at 6 minutes means you're not all that far from full stability, a 0.025V Vcore increase should do the trick. So set 1.325V in BIOS (would be 1.35V actual in your case) and see if it passes Orthos then. Good luck.

 

[telefanatic]

Alright ill try upping the V core volts a little bit , also what is dangerous volts and temps ? Right now Core temp shows 41C and under load doesnt go any further than 60C.

Edit: How long do you guys think the chip will last under those temps and volts ?

 

[harpoon84]

Those temps are fine. How long will the chip last? Many years.

 

[telefanatic]

Alright tried lowering the FSB to 425 now at 3826mhz also lowered the voltage to 1.296 , orthos ran for an hour and got an error. Im going to try and up the voltage a little and see how it goes.

 

[The-Noid]

Up the Vcore, Up the NB a titch. Up FSB termination a titch...

 

[JAG87]

yes, then test for stability after its stable lower each of the 3 voltages, one at a time, until its no longer stable. thats how you find the culprit.

once you find the culprit, set that voltage to what was required for stability, and work on finding the lowest settings for the other 2 voltages.

make sure you have lots of caffeine near you.

 

[telefanatic]

thanks guys! running orthos for 3 hours now seems stable, temps are fine 58C under load and 1.28V on core running at 4005mhz and got my ram at 4 4 4 12 and 1006mhz.