Re: 8800GT 512 vs 1GB
If your new to overclocking i recommend the P5E because it basically does it for you...*sigh* But the DFI boards will give you the better OC's in the end but are much more advanced, and more expensive in most cases.
Ya, i say go with a 4870, but if you already bought that 780i it would be ashame not to use it for what it was designed for :/. If i was in your postion, I would trade/sell off the board for an x38 and grab a single 4870 now, and if not satisfied grab another one for crossfire later. Or you could do the same with the 4850 and save yourself alot of money.
By selling your 780i and getting an x38 + 1 4850/4870, you won't come close to spending 500, but you will be able to play at that resoultion no problem.
Er, what games are you planning on playing btw?
CPU:Q6600 G0 @ 3.7Ghz (410x9 w/1.475v)
Motherboard:Asus P5E X38
Memory:2x2GB OCZ Reapers DDR2 1066
Graphics Card:GTX460 768MB @ 880/1760/2000
Hard Drive:2x WD Black 1TB
Power Supply:Xion 800W
CPU cooling: H50
GPU cooling: Best Stock Cooling I Have Ever Had