I have an Asus A7N8X-E Deluxe motherboard with an AMD XP 3200 Barton CPU. The mobo uses the nVidia nForce2 SPP chip set. The mobo has three memory slots. I have a pair of Corsair Value Select Dual Channel 512 sticks in the blue slots and the system works fine. I purchased a single stick of Corsair VS 512k to put in the third slot. When I do, the system becomes unstable. I ran a series of tests using MemTest+ to isolate the problem. All the sticks test fine when installed solo. The Dual Channel sticks are fine when they are the only ones installed. But when I add the third stick, errors and lots of them. I tried all sort of variations in slot placement and combinations of sticks. No luck. I researched the problem and came across a couple threads that indicates the nVidia chipset prefers the third stick to be the sum of the dual channel sticks. In other words, I could install a 1GB stick in the third DDR slot and my system might be happy. Before I purchase a 1GB stick, I wanted to see if anyone else has any experience with this situation. Another issue: Corsair only list a C3 1GB stick on their web site. The Dual Channel memory I currently use does not have the C3 on the part numbers. I can't find a non C3 1 GB stick anywhere online. Will the C3 stick work with my current memory? My memory settings are: 2.5-3-3-8. Voltage is 2.6. Mobo BIOS is the latest (1013). nVidia chipset and graphics drivers are all the latest. I create motion graphics and I need all the memory I can muster for previews and rendering. So anyway to squeeze more memory from this mobo would be a boon. Thanks for any help.