Nice, (266x15) 3.99ghz.
Anyhow, your RAM should be set to either 3:4 or 2:3 ratio and a 2.1v or 2.2v. Timings? Are they at: 4-4-4-8 or 4-4-4-12 which usually is the common for those ratios.
Have you tried 3:5 with 4-4-4-12 and 2.2Vdimm?
You're not going to fry anything, I've fiddled with mine for several occasions and the worst I've gotten is the BIOS got screwed up but nothing that a floppy disk and drive can fix. Although after BIOS v0606 that hasn't happened.
From your other thread:
Originally Posted by materti
Ok, how do I get 1:1 ratio between OCed mobo which runs at 1066 (266) Mhz, and I have 667 (333) MHz DDR2 RAM. Clearly, 266:333 is not 1:1, so do I downclock the RAM to 533 (266) MHz (is such thing possible at all?) or what do I do? Just tell what to tweak out in BIOS...
RAM as fallows:
DDR2 400 = 200mhz
DDR2 533 = 266mhz
DDR2 667 = 333mhz
RATIOs @ stock speeds.
200:200 = 1:1
200:266 = 3:4
200:333 = 3:5
200:400 = 1:2 just like my system runs at......anyhow
A 1:1 ratio is not good, best are 3:5 and then 3:4 and in some cases 2:3.
So, if you're doing 266fsb then:
CPUfsb 266: RAM should be: 443mhz for a 3:5 ratio or 354mhz for a 3:4 ratio. I would definitely recommend the 3:5 with a 2.2v