What do the specs on PC6400 DDR2 memory mean?

I have an M61P-S3 motherboard in my computer and am looking at upgrading to Windows 7 64 bit. I eventually want to max out the memory which would be 8 gigs (since no one made any 4 gig memory cards). I am kinda vague about what the specs on PC6400 memory cards mean for instance 5-5-5-15 or 5-5-5-18. I am also curious about how fast a cpu I could upgrade to, mine is somewhere in the middle I think.

Thank you for your time and attention.

Jim Heath
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More about what specs pc6400 ddr2 memory mean
  1. Best answer
    Those are the timings of the memory, or it's latency. The lower the numbers, the lower the latency, translating into higher speeds.

    Understand RAM Timings:
    CAS Latency:
  2. Thank you
  3. Best answer selected by Jim5301.
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