ASUS Maximus II Formula - new P45 king?

[CryptiK]

I am finding it almost impossible to get 666 MHz (DDR2-1333) bench stable. My CellShock GKX & TeamGroup GMH sticks all top out at 660MHz, and my Team Group can do 666MHz max screen but very unstable. More vdimm is not helping, neither is the DDR2 CHA/B ref or NB DDR Ref voltages.

Has anyone got over 666MHz on this board?

Asus need to improve the ram overclocking ability. The UD3P leaves the M2F in the dust in this regard.

That`s my result. Room temp is 25,5 degrees.


Under Linpack I have 65\65 degrees of both cores.
Idle temps are 44\39.
Do I have the good core temps with my single waterblock loop?

I get 63*C both cores with Linpack, 1.336vcore at 25*C ambient with a lapped TRUE and Antec 120mm fan on low (~1200 rpm).

Idle is around 36*C.

**EDIT - on the NB temp/instability issue, I was just testing and I was using 1.40v NB and half way through SPI32M it errored with 'not exact in round" so I bumped the vNB to 1.51v and it was idleing at 54*C (lol) so I restarted SPI32M it got about 2 loops in and the system bluescreened and restarted. I think it may have got to ~60*C or so, but I cant be sure I didn't have probe open. It was either the voltage or the temp that made it unstable. I see many people run 1.6 vNB on the UD3P's with no stability issues, so its either a NB VRM issue at higher voltages, or A2 rev. NB issue where it cant handle 1.5V+ and gets unstable above 50*C.

I think I am going to pull the boards sinks off again and try to get better contact on the NB, I really want to be able to run up to 1.6 vNB for benching but there's no way I could do that at the moment due to temps.