Explanation of memory speed to CPU fsb please?

[zilly_boi]

Okay, can someone simply explain to me what is going on here? People say that it is better to have DDR2 matched to the CPU fsb.... if it is not matched going one step above the fsb speed is fine.... but anything above this - results are not great and you are wasting money..... is this true?

So for example an intel quad core running at 1066 fsb.... say if i was going to get 4gb of RAM what speed ram should i get?
1066mhz ram, 800mhz or 667mhz?

Also what ram to get if it was a conroe e6600?

Thanks guys

 

[Ronaldo]

well if you are not overclocking then you get ddr2 533mhz ( PC4200 ), intel quad pump the fsb so the e6600 cpu fsb is acually 266*4 =1066 in intels calculations but ddr2 is 266*2 = 533.

when they run together they are set as 266*4.

amd fsb runs same as ddr fsb which makes it easier to understand

i personally think intel uses the quad pump as a gimmick to make people think the bus speed is faster then it really is