CPU: Intel Pentium Dual Core E5200 Processor BX80571E5200 MOTHERBOARD: XFX nForce 750i SLI Extreme Motherboard VIDEO CARD: EVGA GeForce 9500 GT Video Card - 1GB DDR2, PCI Express 2.0, SLI Support, (Dual Link) Dual DVI, HDTV, VGA Support MONITOR: Acer X223Wbd 22" Widescreen LCD Monitor - 2500:1, 1680 x 1050 (WSXGA+), VGA, DVI (HDCP), Black MEMORY: Corsair Dual Channel TWINX 4096MB PC6400 DDR2 800MHz Memory (2 x 2048MB) CASE: CoolerMaster CM690 ATX Mid-Tower Case HARD DRIVE: Western Digital Caviar GreenPower 500GB Hard Drive - 7200, 16MB, SATA-300, OEM Are they compatible with each other? Right size and everything? ALSO, how much power should my power supply have? 400W? 600W? 1000W?! HARD DRIVE: Western Digital Caviar GreenPower 500GB Hard Drive - 7200, 16MB, SATA-300, OEM CD/DVD BURNER: Lite-On PLDS DVD-ROM/CD-RW Retail Combo Drive FAN: Masscool 8W553 / Socket 775 / Aluminum / CPU Cooling Fan This is my first time building a computer, and I only had a little knowledge of computer hardware... I did like 9 hours of research today to pick out those parts. I'm planning to buy them all from Tiger Direct today, but I want to know if the parts are compatible with each other and stuff. I think the motherboard (45), CPU(65), and video card(350) takes up 460 watts.. But I also have the 4g of RAM and other stuff... Does that mean I need 1000w?! That seems like a ton.. Would this work?: http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=3436149&CatId=1079 "Why are you getting a midrange gaming SLI motherboard with a low end gaming videocard that's not worth SLIing?" I don't know... I'm not really a gamer. I'm into computer graphics though.