Quote Originally Posted by mikepaul View Post
I just tried another set of CM2X1024-6400C4 ($60 after rebate) to get as much extra memory as I can get, and the PC locks up when even one stick of it is in. Don't even get to adjust any BIOS settings. This is with OC to 2.87Ghz/PC-6400 Dual Channel. BIOS 2302 (BAD for 4GB?).

I tried the new stuff alone in the original orange slots, and the new stuff alone in the unused-until-now black slots, and it works fine.

I see the reports of higher vMCH required by some, and not required by others, so I'm wondering where to go next. This P5W only goes to 1.65V and that's where I had it.

Can hardware revisions in the RAM itself make for incompatibility? I got some DDR for my Compaq that wouldn't work so I swapped it out for similar-to-what-I-had-looking chips from another manufacturer. The parts numbers on these CM2X1024-6400C4 are different from the first set, but the heat spreaders make it hard to see anything.

Would more RAM voltage be required, or just be dangerous?

While I wait for advice, I've gone back to stock BIOS so I can see what happens with 4GB. Unless a miracle happens, I'll have to pop 2 sticks just to change the BIOS again.

Really annoying when just plugging something in doesn't work...
Your problem is the 6300's low multiplier. 410fsb is just never going to happen with 4x1GB...