DDR2-800 CL 6 or DD2-667 CL5

I'm looking to upgrade memory in an older system running an Asus P5Q Deluxe MB. This supports DDR2 memory. It's getting tough to find the faster memory in DDR2 and I was wondering which will give better performance, a higher clock rate or a lower CAS latency? I've found DDR2-800 memory with CL 6 and DDR2-667 with CL 5. Any suggestions?

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  1. Why buy DDR2-800 CL6 when CL4 and CL5 are easy to find?

    G.SKILL PI Black CL4 works well at 1.9v: This less expensive CL5 kit also works well:

    Edit: DDR2-800 CL6 and DDR2-667 CL5 have the same latency (15 ns).
  2. I'm looking to move up to 8GB and I'd prefer to go with a 2 stick kit instead of 4. I think I'm lucky though and may have just got the last 2x4GB kit of DDR2-800 CL5 memory that Newegg had. It was in stock, I ordered it, and now it says it's shipped, but the product page now says it's out of stock and discontinued.

    Based on your last statement that DDR2-800 CL6 and DDR2-667 CL5 have the same latency, I take it that it the DDR2-800 would be better. Hopefully I won't have to worry about that though.

    Thanks for the response.
  3. Best answer
    DDR2-800 CL6 and DDR2-667 CL5 should basically perform the same. The lower the latency at a given speed, the faster they are. DDR2-800 4GB modules are CL5 or CL6. My G.Skill 16GB CL5 kit (4 x 4GB) has been very stable at 1.9v and default timings.
  4. Best answer selected by ajreynolds.
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