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post #1 of 5 (permalink) Old 12-13-2008, 11:11 PM Thread Starter
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help with PC RAM

I'm trying to upgrade memory and I'm a little behind on how it works now. I have DDR2 667mhz SDRAM currently.

I'm lookiing at 2 gig sticks of DDR pc6400 but it says it runs up to 800mhz. My question is will this new RAM work? I know you used to be able to use the higher one and it would just run at whatever the cpu could handle. I'm a little confused now days about the change from mhz and the pc"6400" or whatever the number is on certain memory. Any advice is appreciated.

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post #2 of 5 (permalink) Old 12-14-2008, 08:31 AM
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Does the MB have sockets for both DDR & DDR2? I've never heard of one that could run either in the same slot or one that could run both types at once. As for upgrading speed, you will be limited by what your MB can handle. If you don't have the manual for your MB, google the part number or look it up on the mfg website. Your current RAM should have the PCxxxx number on it somewhere. If not, google/look up the part number just like the MB.
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post #3 of 5 (permalink) Old 12-14-2008, 08:52 AM
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If you run two different speeds..the ram is only going to run at the slowest of the two....

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post #4 of 5 (permalink) Old 12-14-2008, 09:10 AM
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Originally Posted by bard
Does the MB have sockets for both DDR & DDR2? .
pc6400 is ddr2

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post #5 of 5 (permalink) Old 12-14-2008, 01:37 PM
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DDR is backward compatible. Go to, run the scan and it'll tell you what and how much your pc supports.

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