Hello, I have a Dell Dimension 8300 3.o ghz 1 gb RAM nvidia FX 5200 Video Card. The dell uses an intel 875 chipset that supports dual channel memory. Currently I am running 2-512MB Sticks of PC3200 in dual channel mode. However, I added two more sticks of 512MB PC3200 with the same timings and specs in the correct slots(there were only 2 left) and now I run in single channel mode. I used HWINFO and the only difference between the old pair of 512's and the new pair is that the old pair has a 1.0 revision and the new pair revision shows "n/a"-all other specs are exactly the same.