If I buy PC3500 Cas 2 do I have to buy one stick of something slower so I can get into the bios to set manual mode for the timings?
I believe the problem is only with Corsair 3200LL. I have this RAM and mb and when I tried to go into BIOS and change to manual, it would freeze before I could change it. Luckily, I still had my 512mb OCZ PC3500EL CAS2 at the time and I was able to get in and adjust things.
There is a modded F4 BIOS by bigtoe you can download here. It defaults the BIOS RAM settings to manual, CAS 2.5, etc., so you will have no problems getting in or booting up.
*Edit* Bigtoe just released a modded F5 BIOS.