G.Skill GBHZ 2.0-4-4-5 @ 273.5 in P4P800

[Axylone]

I'm thinking that the motherboard is holding up the memory, allowing such a low CAS. The tRCD and tRP (x-4-4-x) cannot be lowered without losing stablilty, and I have to drop it down to ~230. The board is a P4P800e-Dlx (no mods yet).
This is OCCT and BF2 stable.

32m 12.750s w/ 2.5-4-4-5 @ 273.5 earlier (http://www.xtremesystems.org/forums/showthread.php?t=90301), so not much difference in super-pi times.

[_damien_]

CAS 2.0 is really tight for that speed. Not sure if I've seen 2.0-4-4 in combination before.

BTW, have you compared the performance difference between 1:1 and 4:5? I don't think running the memory faster than the FSB yields any gain at all when running in dualchannel. The NB-bufring will hurt latency, and the FSB will limit the effective throughtput anyway.

[Axylone]

It's at 4:5 because the CPU only goes to about 250. I can't compare 1:1 to 4:5 because a locked multiplier, but the ratio would probably explain the weird timings.

[_damien_]

It's at 4:5 because the CPU only goes to about 250. I can't compare 1:1 to 4:5 because a locked multiplier, but the ratio would probably explain the weird timings.What? I know the CPU is locked, but if the FSB-speed remains constant, the 1:1 ratio would make the RAM run slower. The setting is called FSB : DRAM ratio, i.e. 4:5 makes the RAM run 25% faster than the FSB, not the other way around. I was suggesting that you run the RAM and FSB at 218 MHz.

[quent]

hum..

Could you post a Cpu-z validation, please.

quentin.

[Axylone]

sure: http://valid.x86-secret.com/show_oc?id=91632

Damien: Ah, I misread your post. I assumed you meant the difference between 1:1 and 4:5 at the same memory speed.

[farksy]

Hmmm nice clocking ! Agree with_damien_ , 2-4-4-5 sure is a odd combination !
How about 3-4-4-8 ?

To me honest, when i first read the timings i was unsure whether this was DDR or DDR2.

[quent]

Thank you ;)

[giorgioprimo]

may you please test them @ cas 3?

Thanks ;)

[Repoman]

See, it's so weird how intel has all these fantastic memory results on DDR1.. wonder what the difference is that AMD can't?

The only really amazing tight timing stuff, like 2-2-2-5 on micron at 250, 2-3-2-5 on infineon at 246 with cheap ZX at that, and this, have been on intel.

[filmbot]

I didnt even think it was possible for UCCC to run at CAS 2 at any speeds.
But I guess Im wrong.
Nice results, this reassures me that I should have no problem when I set up my P4P800 SE with a Dothan and my HZ.