PC6400 Memory Divider

nosferatu · 24 Sep 2007 at 12:55

Hi
Currently running the following:
Intel Q6600 Go on a 334 FSB at 9 x multi with 4 Gig of Corsair XMS2 6400 ram with 4-4-4-12 timings.

The default memory on a 1:1 ratio would be 667Mhz which is PC5300 spec.

I have set mine on a 5:6 divider which gives 800Mhz - PC6400 spec and therefore set the timings back to the rated 4-4-4-12 for the specified 400Mhz speed.
Initially, the bios set the timings very slack at roughly 5-5-5-18 which didn't make sense.

Does the above seem to be ok and generally speaking, is their a greater benefit in running ram at design spec on a divider as opposed to running at say 667Mhz on a 1:1 ratio.

Thanks

Mlingard · 24 Sep 2007 at 14:06

If the timings was on auto in the bios then they always seem to slacken them always best to set them manuel like you did , my geil pc6400 runs 4-4-4-12 @ 800 and more but if i leave it to auto it does the same with me .

The dividers are more help really when clocking and its just finding the sweetspot of cpu overclokcing and memory overclocking , you might think running a 1:1 divider is a lot better than a negitive one but in real testing it might not make much difference or none .

nosferatu · 24 Sep 2007 at 15:16

Hi
Yeah, running Gigabyte P35 DQ6 and timings were on auto.
Figured that if its designed to run at 4-4-4-12 at 400 bus, it would be a shame not to

I've not altered the volts & to be honest haven't even checked them but I think Corsair ram is quite forgiving (1.8 - 2.2V)

Toyed with the idea of running a 400FSB with a 8x multi to enable a 1:1 divider but feel that perhaps that might push the mobo too far out of spec and at the same time will clock chip to 3.2Gig on air (Akasha 965 cooler)

Mlingard · 24 Sep 2007 at 15:44

You would be fine to run 400fsb as long as the cooling is up to it to run @ 3.2 ghz , people have lowered the multi and run some gigabyte boards @ 500 just remember to run the pci @ 100 for the gfx card .

nosferatu · 24 Sep 2007 at 16:08

Think I might give that a try as running 1:1 on a 400FSB with 4-4-4-12 timings should help to really optimise the system.

I suspect that 3.2Gig will be ok with Akasa AK-965 cooler.

Currently 3.0Gig runs about 10Degs hotter than std clock of 2.4 getting to between 60-70 C under load.