A note on DDR400 and the 648 (help!)

648-L
P4 2.53 Ghz
512MB Mushkin PC3200 CAS 2.5
80 GB WD Special Edition
FIC Radeon 9700 Pro
Audigy OEM
OK, after my struggle with bad IDE cables, I tried to install XP. Ran into "file corrupted" and/or "file missing" errors. (Error Number 7, also).
After viewing some posts on this forum, I set the CPU/RAM ratio to be 167Mhz (333).
Now XP is installing as I write.
I spent some good cash for 2 256MB Mushkin PC3200 sticks and they don't work at 400Mhz.
I thought Mushkin was on a level of Corsair and other expensive RAM?
My question is, I'm new to this, so what other RAM settings should I change?
Since I'm going to run at 333Mhz, should I set it to CAS 2?
Could someone recommend correct settings for the 648, please.
Much thanks in advance!

Your RAM is probably fine. The 648 chipset is pretty picky when it comes to DDR400. They do have a list of compatible DDR400 on MSI's website. As far as I know, if they're on the list, they work(?). Get memtest86. Set the BIOS settings to the fastest you can without getting errors on memtest86. If it will run at CAS2 without errors(probably will), that's probably the way to go. I haven't seen any posts in this forum where someone has come up with definitive settings that will make all DDR400 work.
Hope it all works! Some people have been having problems with the Radeon 9700 with this board also.(Actually most 648 boards from most motherboard manufacturers, not just MSI)
I've had few problems with mine, but then I have DDR333 and an NVidia AGP4X card.

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