Ok, this is my first build, and I'm building it for my friend and his family, so it needs to work. My budget is AU$2500 (about $2250 for you americans) and these are the parts to far: CPU: Core 2 Duo E8500 @ 3.16 GHz RAM: Either 4 GB DDR3-1333 or 8 GB DDR2-800, depending on price limit and mobo Mobo: Not sure yet, need help! Graphics: Two nVidia GeForce 9800 GTX 512 MB, running in SLI Hard drives: one 1TB Seagate Barracuda, and one 76GB Raptor 10k RPM Power Supply: Corsair XT650W PSU Optical drive: CD/DVD+/-RW super multi... erm... whatever works. Fans: lots Case: I'll be building it! It will be cool. Well, those are the parts, and so far it all comes in under the budget, so what motherboard should i base this system on? I probably wont be using the DDR3, but i'd like DDR3 compatibility anyway. Also, is the power unit powerful enough for oveclocking the graphics cards and the CPU? CPU would probably be ramped up to 4 GHz, because it looks easy to do so with air cooling. Basically: with the right motherboard, will it all work?