I recently built a new computer. I used 512mb of pc3200 ram and 512mb of pc2700 ram. The first time I used it I ran dxdiag and it said I have 1GB. But now when I run dxdiag it says I only have 768mb. Whats wrong?
Do you have Memory Sharing Enabled in BIOS 256MB for Integrated Video?
If your motherboard supports PC3200 @ 400MHz - running a PC2700 @ 333MHz will underclock the PC3200 to 333MHz. Slightly hindering your performance. Yeah, you will have an extra 512MB of memory. If your motherboard supports dualchannel memory, "I don't believe it will be used if you are running two different speeds even though one wil lbe under clocked." Although i'm not exactly sure about that.
Buy another 512MB of Corsair Value Select for like $50.00 bag the PC2700 and call it a day.