I already have the PSU in my current PC...so no way it will hold out? its def. a quality unit, and would prefer to keep it, as it is also fairly ne
All right, then use it. The HD 4850 recommendation is 450W+ for a system with one card, 550W+ for a system with two cards. I thought you were planning to buy it and recommended the 650TX instead because it leaves more room for overclocking and lots of hard disks and TV tuners and so on. If you don't need all that, your PSU should be all right even for Crossfire.
The P5Q-E is a better choice than the P5Q-Pro.
The cost difference is minimal ($15.00 US)
You get better cooling
2 x 10-100-1000 onboard lan, compaired to one on the Pro
The ability to use 16 gb ram, compaired to 8 on the Pro
An E-SATA rear panel port, none on the Pro
An optical audio port, none on the Pro.
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