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Ram MHZ to CPU Mhz (Need help)

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z3r0

Member
Joined
Oct 10, 2003
Location
Oklahoma
My chip is a AMD Athlon XP 2500 not yet overclocked, and its unlocked. But default is 166fsb/11multi. So what should my RAM mhz be at? Its Kingston HyperX 512mb PC3500. I was wondering how I judge RAM mhz. Say if my CPU FSB is at 160. Is that what the RAM mhz should be at?
 

flapperhead

Senior Member
Joined
Apr 27, 2002
Location
wash dc area
when your cpu boots up the fsb will be running 166 and the memory will be running the same, if u set the ratio to 1-1. since u have pc 3500 it is designed to run approx 216. (422 ddr)that gives u alot of leeway to overclock the fsb and not have to worry about the memory crappin out. so if your cpu can handle a 200 fsb which is 2200 (11x20), then your memory will run at 200 (ddr400). if your cpu can handle a 220 fsb which is 2420 (11x220) then your memory will run 220 (ddr440) .therefore it was a smart idea to get pc3500.
 

Jognt

All round good guy
Joined
Aug 24, 2003
Location
Netherlands
run the RAM 1:1 with your CPU, this i think will give best results, that pc3500 will indeed give you more than enough headroom to OC !
 
OP
z3r0

z3r0

Member
Joined
Oct 10, 2003
Location
Oklahoma
So RAM MHZ and CPU FSB are supposed to be the same for good speeds?
 

Dragonprince

Member
Joined
Dec 4, 2002
Location
CT
On the nForce2 boards most folks have found a 1:1 or 100% ratio to be the most stable and gives the highest performance. Tighter ram timings is more important than top speed on the nForce2 boards. I would run PC3500 @ 200mhz at 5-2-2-2 timings before Id run it at 7-3-3-2 just to get more speed. If you want to squeeze every last bit of performance you'll have to test your board at different settings.

On VIA boards you want to get max speed on FSB and Ram even if they are out of sync.