|The preferred CPU:DRAM ratios** for a Core 2 system are 1:1 or 1:2, but you can only work with the options provided in the BIOS. Ideally, you should be running DDR2-1066 but there's no point changing the RAM just to chase down the ideal ratio. The performance difference is minor. Just stick with what you have.|
** Ratio is based on frequency, not the bogus QDR or DDR ratings. Both CPUZ & AIDA64 are reporting the exact same thing, but for some reason, AIDA64 does it backwards, DRAM:CPU instead of CPU:DRAM, plus it doesn't reduce the numbers to the lowest possible. 10:8 = 5:4, 12:8 = 3:2.
266:266 = 1:1
266:333 = 4:5
266:400 = 2:3
266: 533 = 1:2