ddr and fsb doubt

[ast_now]

can somebody tell me how do fsb things work?

My question is, why should I use pc3200 on a via kt400 if its deffault fsb is 166.5*2MHz when I can use ddr333.
Shouldn't the fsb be 200MHz in order to run ddr@400MHz?
Or is the ramdac different to the system bus or system clock?
Or is this compatibility a more stable overclocking feature?

 

[LtBlue14]

i still haven't heard that any where elseeeee, links please!

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[ast_now]

this asyncronisation thing sounds cool....so it means that on a via kt400 ddr400 always work@400MHz?, no matter if you haven´t changed your mobo's fsb.

if you tweak your mobo's fsb, will the ram speed change too?
is it possible to tweak ram?

where can i find information on those 5 five numbers ppl always post....2-2-2-5-1T, what's all this about?

 

[LtBlue14]

yes yes YESSSSS you can run your memory at whatever speed you want because of ratios
the numbers you are looking for will be somewhere in your bios...i can't tell you exactly where, but it'll be something like "memory timings" and you'll see those numbers, maybe "2.5-3-3-6-2T", maybe something else, but it'll be like that.
and if your fsb is at 133 and you have ddr 400 (200x2) then you want your ratio at 4:6 or 2:3 (because this is the ratio of the fsb:memory). if your fsb is 100 and you've got ddr400, your ratio will be 3:6
let's go with the first one, let's say you go from 133 and overclock 17mhz to 150 with DDR333 (which is 166x2), now if you keep your ratio the same (4:5 for 133:166) your ram is at 150x(5/4) = 187.5 (x2) = DDR 375
before overclocking, it was 133x (5/4) = 166 (x2) = DDR 333
ram speed does change with fsb speed, and "tweaking" your ram consists of change its speed, its timings, and possibly its voltage (something you shouldn't do unless you know what you're doing)

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