OC Help for E6400 Asus P5B-E

Eron

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Jan 4, 2007
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CPU- E6400
MB- ASUS P5B-E
MEM - 2x1GB OCZ PC6400 DDR2800 Platinum Rev2 2.1V 4-4-4-15

vCore in Bios is 1.45 in cpuz it show 1.38
vDimm is 2.1V
vFSB : 1.4V

PCI-E : 100MHz
PCI: 33.3MHz

Everything in the CPU config is disable
mem config 5-5-5-18-6-42-15-15-15-15 <- Rated timing cannot boot, I try the slowest timing to see if I can boot

Memtest shows the memory to be running fine at 400MHz with the rated timing when system at default 266 MHz and even stable with 333MHz.

However the highest I can get seems to be only 350Mhz, Orthos, memtest and prime95 runs without error but the network is not working properly, frequently losing connection and even when it is connect, data seems to be messed up.

Start to get errors when speed up to 360Mhz, try 400 or 401, wouldn't boot at all. Shouldn't the E6400 be capable of going a bit higher then what I can get? Seems like if I want network conenction, the best I can get is 333MHz.

What can I change and why is the higher frequency affecting the network connection?

Should I try to lower the multipler and see if 7x400 is possible since if 8x350 works, there may be a chance 7x400 will work and I believe that will be better preformance then 8x350.

Any suggestion is welcome.
 

Eron

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Jan 4, 2007
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I did follow the guide. I am using just the stock cooler, the temperature from TAT and coreTemp show cimilar value, idle around 28c and 50C when 100% load on both core with TAT, the ASUS Probe shows a temperature that is almost 10C higher. This is when I am using 350MHz, The idle temp are almost the same when using 266 or 333 but loaded temp are 45 and 48.
 

wimcle

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Oct 17, 2006
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My first guess would be northbridge heat, put a fan on it and/or reset it with new thermal paste.

W/o direct air the passive cooler on my ds3 would be too hot to touch at 400Mhz.
 

Eron

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I try more setting and discover that I leave the "Static Read" setting at auto, once I disable it the network problem is gone and memory are more stable, running at 8 * 375MHz with memory at 400MHz timing of 4-4-4-15 still manage to go through 8 hours of test with 30 complete pass of memtest86+ without an error. It got a few errors before I change this setting at only 350MHz & 5-5-5-18 timing.
Core Temp and Tat showws the idle Temp is around 29 with 100% load in TAT shows 57, I guess this means the stock HSF is not efficient enough and that's probably why I can't go any higher. I run Ortho for two hours without an error and the SuperPi calculation all work without error, however one of the dual Prime95 did not pass after about half an hour, the other one keep going without problem. Since memtest pass, I would assume the problem is not from the RAM, will run the small FFT test to confirm later.
I did use the system to do some work, play some game and it is up and running the whole night without problem, do I have to worry about it not passing the prime95 test when it pass everything else? It doesn't give error at 350MHz, may be I should just stick with 350 or try 360 and see how it goes.
With the static Read setting at disable I can even change the vCore down to 1.35 & vFSB to 1.3 in BIOS, cpuz show 1.3, would rasing it again help? if I change the vCore in Bios to 1.4, I would get closer to 1.35 value in cpuz but that will bring my idle temp to 30 and 100% load temp to 59 in TAT then the ASUS probe will warn me as it think the temp pass the 65 point.
 

Eron

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Jan 4, 2007
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My first guess would be northbridge heat, put a fan on it and/or reset it with new thermal paste.

W/o direct air the passive cooler on my ds3 would be too hot to touch at 400Mhz.

I can try to re-apply the thermal paste but the heat sink on the northbridge is huge and doesn't feel like it is hot, I can touch it and hold on ot it with out problem even when it is 100% load so I don't think a fan will help. How to remove it safely, it seems to be sticking to the chip pretty hard, I try to pull it and it doens't seems like it will easly come off.
 

taiga

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Feb 18, 2007
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Hi,

I have almost an identical system as Eron,

CPU- E6400
MB- ASUS P5B-E (BIOS: 0706)
MEM - 2x1GB OCZ PC2-6400 DDR2-800 Gold

Using AI NOS I have OC CPU@2.6GHz

I would like to know the exact parameters in BIOS I need to change to have the "modestly highest" stable performance.

Thanks