e6600 on p5b-dlx wifi

[Froz]

I posted this over at Intel CPU but I wanted to see if anyone with a P5B dlx has ran into this issue and hopefully overcame it.

I finally have the CPU watercooling in place and I've been doing some serious testing on the overclocking front. Here's what i've learned so far:

I can definitly attest to the issue described here:
http://www.thetechrepository.com/showthread.php?t=30

9x398 vs 9x404
-Inter-Core Bandwidth MB/s: 10527 vs. 10290
-Inter-Core Latency ns: 45 vs. 54

-Dhrystone ALU MIPS: 33011 vs. 33478
-Whetstone iSSE3 MFLOPs: 22704 vs. 22366

-Memory Latency ns: 68 vs. 84
-Speed Factor (lower is better): 80.7 vs. 98.2

-INT Buff'd iSSE2 MB/s: 7311 vs 6828
-Float Buff'd iSSE2 MB/s: 7333 vs 6783

The above stats are based off of 4-4-4-12-4 timing ( trfc 20, trrd 10, rank write to read: 10, read to precharge delay 10, write to precharge delay 10). Temps are in the 45C range.

I can't seem to get above 404 stable voltage wise. More vcore or fsb, nb,sb etc doesn't seem to help. Even to hit 404, I've got to up the anty quite a bit. Perhaps I should relax my timings to push beyond 404 but lLooking at that chart though, I'd have to hit like 455 to equal out at 398? I definitly don't think this setup can do that x9.

Am I going about this rightway? Reading the post above, if I drop the multi down to 8, it's going to give me probs with the nbcc.

9x398 for 3582 is a pretty decent return on this investment but it seems like i should be able to go a bit farther.

TIA,
Froz

 

[PanteraGSTK]

First off, the 965 chipset has a strap change at 400mhz. 399mhz and below are 1066 strap, and 400mhz and above are on the 1333 strap. I got rid of my S3 because it is always on the 1333 strap. You may have hit a fsb wall with your cpu. I had the exact same wall with my first e6300 so you aren't alone. It is very frustrating and there is nothing (that I've found) that you can do short of a phase cooling solution. For your 6600 the 3582mhz is good if you have a newer chip, the older ones can clock higher usually, but not always. Have you tried lowering the multiplier to 6x to see what your max fsb is?

let me know what you find as I am in the market for a 6600 or a 3060 xeon.

 

[Froz]

yeah, i can go to 450 without any loosening of timings.