Hi, Building a gaming spec PC from scratch and looking for the best components so far i am going with: MOBO: ASUS P6T Deluxe CPU: Intel I7 975 extreme edition RAM: DDR3 12GB (6x2GB) HDD: Seagate cheetah SAS @ 15000RPM DVD RW: Samsung 22x SH s223F so far so good???? What i am looking for is advice on graphics and audio cards. i keep hearing people using 2 cards does that just give u double the memory or is it more? for example if i got 2 x XFX GeForce GTX 260 Black Edition Video Card @ 896MB that would be a total of 1792MB but one BFG GeForce GTX 295 Video Card has 1794MB so which is better??? Also what is the difference between SLI and crossfire? and which is better.

SLi is for pairing up nVidia based cards, Crossfire is for ATI based cards. It's not so much about combining the video RAM as it is about combining the processing power of two GPUs. If you check the charts, you'll see that there's not a huge difference between an SLi config & a single card, but there is a huge difference in cost, power requirements & the amount of heat generated within the case. Generally it's a waste of money but looking at your shopping list, money apparently isn't an issue. http://www.tomshardware.com/charts/... You'll need a decent power supply to handle the load of a system running two high end video cards. Do NOT cut corners on the PSU. Plan on spending at least $100 on a quality unit with a single +12v rail with high amperage. 12GB RAM? You'll need a 64-bit OS to take advantage of that much RAM.