ASUS P5W DH - Problems + Fixes Thread

[Falkentyne]

Just noticed something, with my board not matter how i try it I can´t get past 890 MHz stable. To get there I had to put 1.34V Vcore when I try 400 MHz it posts but but it ain't stable.
Tried puttin' Vcore to 1.40 and even 1.50 but no dice. The only conclusion I can take is that the P5W doesn't like 400MHz FSB on Quads.

Daimao:
You're using a 1.04g board right? (i assume you are since you can go down to 1.34v on your Q9450).

The highest stable FSB i can get on mine with a QX9650 is 380 fsb and that requires 1.85v mch or 1.75v mch+1.30 FSB (someone posted that FSB voltage affects mch voltage but i can't find the post right now, and search isn't helping). 390 FSB gives errors in memtest at 1.85v mch and 1.40 FSB so its unusuable, and 400 FSB won't post on mine. I'm sure it would post fine with a dual though. Note that with a divider my RAM can handle 450 mhz @ 2.1v, cas 4-4-4-12, but once again, to do that, I need 1.85v on the mch (or 1.75+1.30 vfsb); its the 2x2GB Gskill pc-7200.

The reason the P5W doesnt' do well on quads is not just because of lacking TRD and TRFC (Tomcug where are you??), but also there seems to be only one GTL/REF divider on the board, so the CPU has to handle the other one internally, which limits highest FSB. I just use an unlocked multi (333x12) for 4 ghz on mine (1.3625v).

PCI-E frequency MIGHT improve HDD loading benchmarks SLIGHTLY (I wonder if someone has done a HDtach or that other bench tool with different PCIE speeds), barely improves 3dmark, but some people say that it helps you overclock the core or memory on some video cards a few more mhz. Don't go above 110 if your using RAID (105 is safe) or 115 mhz for normal SATA.