I'm thinking about getting a RAM upgrade for my PC, but I have a little question.

If I have 3 sticks of 512MB Corsair PC3200 400MHz Dual Channel DDR RAM and a stick of 1 GB 1024MB Corsair PC5300 400MHz ect. will the Memory be compatible and at its full potential?

Right now I have 4 512MB Corsairs (all PC3200) and I don't want to send 100$ on and upgrade that won't work.

And just for incase, (Sckt939) ASUS A8N-SLI nForce4 SLI Chipset SATA RAID Dual PCIE MB w/Gb-LAN, USB2.0, IEEE-1394, &7.1 Audio is my motherboard.

Thanks!