I have OC's PC3200, don't remember which off the top of my head, 512MB stick of DDR RAM in my Soyo KT400 MB. Whenever I set the memory timing in the bios to fast it won't boot. If I change any of the memory timing setting to anything the the slowest settings it won't boot. I have tried raising the voltage to 2.8 but that doesn't help. I am running my memory bus at 166MHz. Isn't this memory supposed to be able to run much faster than what I am asking it to? The only thing I CAN do with it is run at CAS level 2. All the other settings have to stay at the slow speeds.

Thanks
Keith

try slot 2 and 3...my computer won't boot if i install my Corsair XMS pc2700 512mb on the first bank and set to the fastest timing in the bios
but it will work with slot 2 and 3

You mean you have OCZ memory? Or you mean that your OC'ing you RAM. Take the strip out and get the product make and model. Then go to OCZs' site and get the memory setting. Like - (2.5,3,3,7) With my experience setting this Fast or Turbo mode only changes the memory timing. I also had stability problems and switched it back to Normal. Then I manually set my timings to my strip accordingly (2,2,2,6,1T)- Corsair 512-XMS2700 LLpt; then bingo no problems. This setting just changes the timings for you.
No need to change the voltage. And why you running @ the 166Mhz setting, not 200Mhz like it should be set at. By the way your memory might not be able to handle those agressive settings.

J^

I agree with JMano on this, you need to figure out exactly what type of memory you have and what memory timings it is supposed to be able to do. If it isn't performing as advertised, send it back and tell them to replace it on the gounds that it is faulty.