To have or have not? that is the question. I cant decide to go crossfire on my 57 series card or just upgrade to a new single card ? what do you guys think? thanks.

That depends on what you use it for.

-Multi screen setup?
-What games do you play the most? Do they support Xfire (not all do, and even if they do, it doesn't always work as advertised).
-Will your current PSU support crossfire? (extra expense if it doesn't).

If yes, an Xfired 57XX is still a good performer for current games, and if you find a good deal in a used one, why not?

Otherwise, I'd go with a 78XX or 79XX 3GB, and you might see the same or better performance boost than Xfire.

Dual Cards = Killer Benchmarks and more
problems than solutions IMHO.If simulations
is your thing, then x2 on that comment.

Get the best single card that you can
afford and call it a day.

You'll thank me for it, trust me.

Just checked Newegg USA. No HD57xx in stock. Other HD5xxx are overpriced compared to performance of HD7xxx cards.

My single HD7970 beat my two HD5870 in CrossFire and crushes them in "compute" tasks. Also handles 3 monitors for Eyefinity with a single card.

The HD7750 in our HTPC performs as well as an HD5770 (we own one) -- which was all AMD wanted it to do.

For a normal sized (1920x1200) single monitor, HD7970 is overkill for a person on a budget.

So, suggest get the best HD7xxx card you can afford. On sale, HD7970 can be had for just under $400 with free shipping -- just check Newegg every day until you find one you like for that price. They had a dual fan model a few days ago at that price. Today they have a couple standard cards for $410 with free shipping. Assumes one lives in USA.

GTX670 is a very good card for the money. Stock HD7970 about the same but wins BIG in compute tasks (many applications are starting to use the GPU compute to accelerate the application) and also wins for multi monitor.

No hurry of course. Prices seem to go down and speed goes up every few months. HD8xxx series not due until December at earliest.