I am running a Corsair 850TX power supply as well. If you don't mind the fact that your PSU will not be modular, I think you're good to go.
Originally Posted by JD_May
Well what card would you recommend? 5850? Dual 5770s?
I am running a single Sapphire Radeon HD5850 in my Core i7 rig. Currently I endorse the HD5770 (at $150/card) as the best "bang for the buck" SINGLE card because the Radeon HD5850 is currently overpriced.
When the Radeon HD5850 was released in late 2009 the price was $260. Nowadays you can hardly find one for under $300, and supply is limited to boot. Yes, the HD5850 is a very good card and will be "future proof" for quite some time, but fact remains that it is about $50 too high at current pricing
[Edit: it appears you can now get a standard (non-OC'd) Sapphire Radeon 5850 for $285 shipped from Amazon. This is obviously a better deal than $300/card but IMO still a bit high. I'd be miffed if I was paying $285 for a card that I could have bought for $260 in October 2009. Component prices are supposed to go DOWN over time, not up!
If you have money enough for two HD5770s I recommend going to a single, more powerful, card. IMO one should use Crossfire to (1) keep an older system current or (2) maximize performance with the very top-end card available. Using two cards has several disadvantages. They take up massive amounts of space (the HD5970 is over a foot long), they produce more heat, they take up two (or more) of your 6-pin power plugs on your PSU ... the list goes on and on.
No need to saddle yourself with all these downsides from the get-go; wait until you need to prop up your system to take them on. Go with a single card (the best you can afford) for now.