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P5W DH OC'ing problems - need input

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kevsta112003

New Member
Joined
Sep 2, 2006
I am OC'ing an e6400 on my P5w DH deluxe. Ive got an 850 watt PSU, and G.Skill DDR2 800 RAM. My 6400 is bein cooled by a big typhoon, and it loads at 45c at 3Ghz with 1.3v.

Now, my problem is weird. My computer only boots when I have "Configure DRAM timing by speed" set to enabled. When its enabled, the ram timings are rather loose, and my RAM speed is running in a 1:1 ratio, so 750MHz. So what confuses me, is why when I set it to DISABLED, with 4-4-4-12, and 750MHz, it wont boot?

The RAM works fine at DDR2 800 MHz, 4-4-4-12 with no OC. PC6400 4-4-4-12 is its stock speed. What could be my problem here?

Memory is getting 2.0v
ICH is getting 1.05
MCH is getting 1.5
FSB termination or w/e is set to 1.4
Hyper Path 3 is disabled.
It was happening in bios 1101 and I just updated to 1305 and its still happening.

Just a note also, I was able to have it disabled and the timings at 4-4-4-12 at 340x8 (2.72Ghz). Any higher I had to set it to enabled, even though the frequency it was running at was a mere 680Mhz. I had to disable Hyper Path 3 as well just to get past 320x8(2.56Ghz)
 
I've got a P5W too, and 2GB of Gskill DDR2-800 I just got (to replace some Patriot DDR2-800).

I've had no issues with it 1:1, at 407 FSB (MB won't play nice no matter what above that number), with manual timings of 4-4-4-11-4.

Thats using 2.05 V mem, but more importantly, as you seem to be trying to run 375 FSB or higher, you need to go 1.55v on the NB. 1.5 may be borderline.

That may not be your problem, but I've found that when you start getting up there in FSB, you need more power to the NB - not as much as everybody thinks (many seem to max that voltage when its not needed).

I found that 1.55V takes stability on my board to about 395 FSB - 1.6 will take it only to 402, and the 1.65 402-407 (a bit higher if I don't have to boot at that FSB).

Anyway, I've found 1:1 to be fairly decent so far (limited testing) - my patriot RAM was giving issues at 390mhz or higher.

Have you tried memtest ?
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