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Quick Memory Question

K

Keith130

Limp Gawd
Joined
Aug 17, 2003
Messages
378
Im still a little confused on what memory you should buy for certain FSB's. Should the actual clock speed of the RAM (not effective) be the same as the actual FSB e.g. not the quad/dual pumped speed?
 
Yes you want the ram to equal the FSB before it is quad or dual pumped.

So for example with a t-bred you will want pc2100 (DDR266)
For a barton with 333fsb you will want pc2700(DDR333)

Also keep in mind that if you want to overclock, especially on an AMD you will want the RAM to stay at a 1:1 ratio where as Intels can run fine (usually better) with a divider.

So if you have a 2500+ barton that you want to overclock to 3200+ speed remember to buy pc3200(DDR400) so it can run in-sync with the FSB which will then be at 200mhz.

Sorry if thats alot of rambling its early:D
 
So if I was to get some DDR333 memory and run my divider at 4:5 then it would work fine, since myy DDR266 wont run at that speed?
 
Yes im assuming you have an intel setup. They don't mind running the memory out of sync with the FSB nearly as much as an AMD cpu.

You will be fine running with the divider if you want to save some cash on cheaper RAM.
 
yeah what he said ^.. If you have an intel, then get faster rated ram than what you have now if you want to overclock. What are you specs?
 
Ive got a 2.0A @ 2.6 and 1.7Vcore and im using PC2100 only running at 130MHz (260 effective) using a 1:1 divider.
 
If your motherboard supports FSB:Memory dividers then you dont need anything faster than PC3200 for an Intel platform. AMD rigs usually run best in 1:1 but for Intel it doesn't matter on the 865 and 875 chipset. 5:4 and 3:2 will run just as well as 1:1. Main reason for that being is because of dual channel. Dual Channel effectively doubles the bandwidth already so the need to run the RAM at high speeds for more bandwidth is no longer there. You just want to buy RAM that matches the DEFAULT FSB speed. After that you can just switch to a divider if you want to overclock.
 
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