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Dell Dimension 4700 memory upgrade question-a mix of DDR2-400 & 533?

gcmmia

Junior Member
Just purchased a Dimension 4700 from Dell Outlet; I got 512MB of DDR2-400 RAM(2x256).
I bought an upgrade from Crucial: 2x512MB of DDR2-533 (PC2-4200 ? CL=4 ? UNBUFFERED ? NON-ECC)
From searching these posts,it seems that the 4700 will run DDR2-533 at the full speed; is this correct?
Am I better off running ONLY 1 PAIR of the new 2x512MB of DDR2-533 for a 1GB total RAM;
or should I run BOTH PAIRS (2x512MB of DDR2-533 and 2x256 of DDR2-400) for a total of 1.5GB RAM running at the slower DDR2-400 speed?
Which configuration would give better overall performance?
I do a lot of Photoshop work, and some light video encoding.

Thanks in advance for any help.
 
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