I used to build alot of rigs for gaming but have been out of the loop for a few years now. Building a new system and I could really use some help with a few questions. Thnx a truckload for any wisdom ya can spew on me. Questions: 1) What in God's name are all these different PCI slots for? x16, x8, x1, PCI X... The 16's I know are for the GPU's but I'm having problems selecting a mobo because I'm not sure what kind of slots I'll need. Is there a guide around on what the different ones are for? 2) Bus Speeds. I've purchased an AMD 64 x2 6400 Black Edition. There seems to be 2 choices for bus speeds the mobos come ready to handle, 2600 MHz and 1000 MHz. Why such a huge difference? (The new CPU's bus speed is 1000MHz (2000 MT/s) ) 3) Memory and their speed. If I remember correctly, on AMD stuff you multiply the memory # x2 to get your bus speed? Like DDR2 200 would be meant to run at 400 MHz. (2x200=400) The new CPU's bus speed is: 1000MHz (2000 MT/s), and I'm gonna o/c it. What speed memory do I get? I can't order the mobo and mem til I figure this out so I would really appreciate any help you guys could give me.