I bought my ASUS A8N-SLi Deluxe from a friend last year and have been running it with an Opteron 170 @ 2900MHz (290x10) and 2x512Mb PC3200 Corsair Value Select RAM.
Recently, I changed the RAM to 2xOCZ 1Gb Modules
which will only run at 200MHz. (I had the same problem with my Corsair modules but I just put the problem down to cheap RAM.) If I set the speed to "Auto" in the BIOS it sets the speed at 266MHz and the computer won't boot past the POST stage. I get the same result if I choose anything higher than 200MHz manually.
CPUz reports that the OCZ sticks are running at 146MHz (FSB: DRAM CPU/20). I understand how the FSB: DRAM ratio works, but can't find any way to change it.
My BIOS revision is 1805.
Hopefully there's just a setting I've missed in the BIOS. If anyone could help with this, I'd be very grateful.