what ram should I use

Corsair 1gb pc2-6400 ddr2 dimm memory ki...
July 31, 2009 at 20:15:35
Specs: Windows XP, 6400
I have DDR2 DIMMF 1GB 5300
and I just bought 2 1GB DDR2 6400
Should I run all 3GB at whatever speed the 5300 is or just 2GB 6400 at 800mz?

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July 31, 2009 at 21:16:50
It would depend upon your workload. If 2gb is enough to run your normal workload, then there should be minimum use of the pagefile. In that case the faster speed would probably be best.
However, if you need more than 2gb to run your normal workload, that might cause excessive use of the pagefile. Using the 3gb at a lower speed and avoiding the pagefile usage might be better.

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August 1, 2009 at 06:09:03
You didn't list any other system specs? The proper RAM configuration depends on the motherboard & CPU. For example, almost all boards support running the RAM in dual channel mode these days...if you install 3 sticks, you'll force it to run single channel mode.

Also, if you install the PC6400 (DDR2-800) along with the PC5300 (DDR2-667), all the RAM will run as PC5300.

And lastly, if you have an Intel system, there's a certain CPU:DRAM ratio that *should* be maintained to provide best performance. If you have a Core 2 system, that ratio is either 1:1 or 1:2. If you have a P4 system, the ratio is either 3:4 or 4:5.

If you have an AMD system, there is no ratio to be concerned with...you should be running PC6400 with all non-Phenom based CPUs or PC8500 for all Phenom based CPUs. Anything else hurts performance.

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