Hi guys! I'm considering a GPU upgrade sometime around Christmas / New Year. My current specs: CPU: AMD Phenom II X3 720 (BE) @ 3.6GHz OC Mobo: ASUS M4A78T-E Mem: 1 X 2GB DDR3 (1333 MHz) Transcend Video: XFX Nvidia GeForce 9800GT (512MB GDDR3) PSU: Cooler Master Extreme Power Duo 600W OS: Windows XP Pro (32 Bit) I have a lot of confusion regarding my choices. 1. My primary considerations were 2 HD4850 (512MB) in CrossFire or the HD4870 (1GB). Which is a better choice? 2. Also does the HD4850 (512MB) in CrossFire outperform the GTX-275 / HD4890? 3. Will buying the HD4850 1GB cards be better if I want to go CrossFire? 4. Cooler Master says that the PSU is SLI and CrossFire ready. Will it provide enough juice to 2 HD4850 cards? 5. I have the ASUS M4A78T-E motherboard based on the AMD 790GX chipset. Is it a good board to CrossFire on? Will there be any issues with dual GPUs on my board? 6. Will two cards in CrossFire run very hot? Will I require aftermarket VGA coolers? I plan on the GPU upgrade as I'll be probably switching to a 22" monitor sometime. Thanks in advance. Look forward to all your responses.