Have you tried if you can push them to 1066 when setting a relaxed Performance Level ( 6+, don't know a specific number, never used a P35 ) and a tRFC of 55 or higher?
tRFC is the most important timing for these 4GB kits.
I set the PL as loose as possible, VDIMM 2.2V, tRFC 60+.
What happens is the BIOS boots extremely slowly, crashes, claims its corrupt and starts the BIOS recovery, or if it manages to boot fine, Memtest will report errors.
I am happy with DDR2-1000 though, so now I am just working on tweaking so it is stable at extremely tight timings. I read on some earlier pages someone was more stable at 5-5-5-12, so I'm trying that right now.
Asus P5K-E/WiFi-AP (1305 Bios)
Intel E8400 @ 4.33 GHz) [1.416V Load/1.424 Idle]
4x2GB DDR2 (5-5-5-15-2T PL 8) [2.0V]
GeForce GTS 250 1024MB
HT Omega Claro Halo (2xOPA2107 -> LME49860)
TRFC 60 is overkill, it should not need to be that loose on most boards. 55 should be plenty.
As for voltages, you also should not need to pump vMCHthrough the roof, unless you're dead set on maintaining a tight tRD / PL while running a relatively high FSB. In addition, watch your vDIMM and keep them cool. No need to be pumping 2.2v+ into these chips; they don't need it and they don't want it.
Formerly XIP, now just P.
Bookmarks