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I have 2 x 1GB on 800Mhz CL4 memory in my PC. I'm planning to upgrade to 6GB by adding a pair 2GB modules.

Is it ok if I buy CL5 modules or do I have to buy CL4?

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up vote 2 down vote accepted

yes, should be fine, but all will run at CL5.

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What operating system are you using? You should be aware that you need to run a 64-Bit system to support more than 3,5GB of RAM.

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I plan to upgrade to windows 7 64bit –  user42966 Jul 15 '10 at 12:57
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