Well its about that time my computer to be upgraded. It seems like my Ram is the first thing to start going senile in its old age. So anyways. My MOBO is an ASUS P5N32 SLI SE - Deluxe Newegg.com - ASUS P5N32-SLI SE Deluxe LGA 775 NVIDIA nForce4 SLI x 16 ATX Intel Motherboard - Intel Motherboards My current/old ram is CORSAIR XMS2 1GB 240-Pin DDR2 Newegg.com - CORSAIR XMS2 1GB 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Desktop Memory Model CM2X1024-6400 - Desktop Memory Now this is where I need some advice. I am looking into buying this CORSAIR XMS3 4GB (2 x 2GB) 240-Pin DDR3 Newegg.com - CORSAIR XMS3 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMX4GX3M2A1600C9 - Desktop Memory My questions are these. Are the sockets the same? IE does 240-PIN mean socket size for mem sticks? Because My mobo says it supports DDR2 up to 800 will it even run this new DDR3 memory? Will I get any benefit from it if it does? Also I have yet to run a memtest on my comp to check the ram for errors but I plan on doing it tonight while I'm sleeping as it says it takes something like 12 hours for a full sweep. But even if it does have some errors should I toss them when I replace them or keep them in with the new RAM I will be buying for further speed/support? Or will it basicly keep ruining things even as support memory sticks? Thanks in advance guys. Hope you all can help.