Ram ratio

Question

first of all how do you change your ram ratio on msi 875p
and am i right in thinking that 1:1 is best for performance
my specs:
msi 875p neo fis2r
p4 2.6(533fsb)(changing to p4 3ghz 800fsb)
pc2700(ddr333)dane elec(changing to k'ston hyper x pc3700 )
geforcefx 5900
audigy 2
6.1 inspire spks
antec true blue 480x psu

Answer 1

If you have a P4C (800FSB) CPU, these are your available FSB:RAM clock ratios:
CPU=200 DRAM=532 gives FSB:RAM=3:4
CPU=200 DRAM=500 gives FSB:RAM=4:5
CPU=200 DRAM=400 gives FSB:RAM=1:1 -> AUTO default
CPU=200 DRAM=333 gives FSB:RAM=5:4 (865/875DRAM=320 MHz due to )
CPU=200 DRAM=266 gives FSB:RAM=3:2
As you change "Adjust CPU Bus Clock" from the 200 MHz default, your DRAM frequency also changes based on the corresponding FSB:RAM ratio.
If you have a P4B (533FSB) CPU, these are your available FSB:RAM clock ratios:
CPU=133 DRAM=354 gives FSB:RAM=3:4
CPU=133 DRAM=333 gives FSB:RAM=4:5 -> AUTO default
CPU=133 DRAM=266 gives FSB:RAM=1:1
If you have a P4A (400FSB) CPU, these are your available FSB:RAM clock ratios:
CPU=100 DRAM=266 gives FSB:RAM=3:4 -> AUTO default
BTW - on my system with a P4 1.8A , I have the ff. options available with BIOS 1.6 up to 1.8 beta:
DRAM Frequency = 266, 333, Auto, 354
But with DDR400 installed , I can't get it to boot with DRAM=333 or 354 settings.