Im not very expert with these things but I have an extra 2x1GB sticks of GSKILL DDR400 PC3200 1GB, and am trying to add them in to my DFI mobo that already has PC4000 DDR500 memory, for a total of 4GB. See my signature below. Is this something that should work? I tried increasing the DRAM voltage to 3.0 but it was not working. I had to clear CMOS to reboot again. The PC4000 is in the orange slots and was trying the PC3200 in the yellow slots. thanks for any advice.