Were you planning on purchasing the extra 512 from CompUSA? Or were you just there getting a formal opinion? I think that you may see a little bit of a difference even by replacing the 2 modules with 1 module of 512. Sounds like it wouls be the same....and, yes, the amount of RAM would be. But since the entire module is accessible via one communication link make the difference. The difference is going to be there but it may be so insignificant that you may not actually "see" the difference. The question will be.....will the price justify the difference in performance and vise versa. You can always return the RAM if it doesn't work out ya know?
-Mike
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