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Need help on P4P800 DELUXE - Page 2

post #11 of 16
Did you disable legacy USB support in your BIOS? That seriously messes with Memtest and produces lots of false errors.
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post #12 of 16
Thread Starter 
What exactly does 'performance' option(auto, standard, turbo) mean? Also 'memory accelleration mode' (enable/auto)? Corelation between these two? Thanks

On my board ram timing options are sets of 3/2.5/2, 2/3/4, 2/3/4, 5/6/7/8, 4/8. Is 2-2-2-5-4 is tightest combination?

If I disable legacy USB, doesn't it disable normal USB functions(2.0)?
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post #13 of 16
Nope, USB 2.0 works fine with legacy (read: old) USB support disabled. If you need legacy USB support, disable it temporarily to get Memtest to work and then enable it after the tests are complete.

2-2-2-5 is the tightest timings commonly available. The final number (burst length) runs best with a higher number. I personally leave all of the RAM performance stuff on auto and just manipulate the timings and vdimm manually.
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post #14 of 16
Thread Starter 
It took two nights to test most combinations with memtest. It seems that in my case (P4P800 DELUXE + Northwood 1.8A), the highest stable limit is around 2.8. It could reach 3.02 but apprently not stable under my system.

Right now, I run on FSB 156 to 2.84. Memtest showed no error beyond 1700%. Current setting is as follows;

FSB 156
Dual Channel (Physically DDR400 512 X 2 PDP system pc3200)
DDR 266 (Manual)
Performance : Turbo
V-core : 1.6
Ram Timing : 2-2-2-5-8
Memory Accelleration Mode : Enabled
FSB:RAM = 1:1

CPU-Z validated
http://valid.x86-secret.com/show_oc?id=73285

Through my tests, I found that DDR voltage and AGP volatge doesn't make difference. But v-core really affects stability.

I might get higher than current setting once I raise v-core more (upto 1.8). But I'm not sure whether 1.8 might burn CPU. Any comment on it?

Last thing which I haven't had a chance to test is PSU. I use my old P3 PSU (200w) with P4 adapter cable(12v) which might have affected stability my OC test. Does it make difference?

Concerning CPU temperature, I actually didn't take that much care since it didn't go up that high, even with FSB 168 (under 38).

I also tested both single channel and dual channel but found no difference in terms of getting maximum satable edge.
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post #15 of 16
PSUs do make a major difference, but a 1.8 isn't a particularly power hungry CPU. If/when you build a new system with overclocking in mind, a higher end PSU would be a good investment.

Vdimm also does play a major role in overclocking, but since your RAM is still underclocked, you won't have to mess with that setting at all. Just be sure not to discount the importance of vdimm when overclocking future builds or if you decide to pump up your RAM speed in your current build by use of a divider (which I definitely suggest once you have the CPU maxxed out as it may increase performance).

I've never personally messed with AGP voltage. I have occasionally seen people bump it up a notch when heavily overclocking a GPU, but it doesn't come into play too much.

Those older CPUs tend to run pretty cool, so your experience is in line with the norm.

Good work on your OC.
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post #16 of 16
Thread Starter 
Thanks a lot. I'll stick to current setting for a while.
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CPUMotherboardOSMonitor
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