GoaThief said:
Avoid anything Xfire or SLI too, headaches aplenty I can assure you. Don't plan this for now or upgrades down the line, sell your card instead and purchase a higher specced single GPU one instead.
Eh, I'm not sure what headaches you speak of, unless some games not utilizing them. SLI at least is damn easy to set up. Plug in GPUs, put on SLI bridge, tell Drivers to run SLI.
Though selling the current card to help pay for the new one is good advice.
Solo-Wing said:
Most people have been recomending I get the 6670 for the cross-fire.
So I am thinking of getting this:
http://www.gigabyte.com/products/product-page.aspx?pid=3832#ov
or this:
http://www.asus.com/Graphics_Cards/AMD_Series/HD66702GD3/
Any objections?
I wouldn't go for 2 6670s TBH.
Quick lookup of Benchmarks shows an individual 6670 to be rather low scoring, and Xfire won't even double that most of the time.
This site, no idea how reliable but it is the easiest to see graphical representation I could find, highlights the 6670 individually with a score of 1,146
http://www.videocardbenchmark.net/video_lookup.php?gpu=Radeon+HD+6670
Scrolling up on the same site yields a 560Ti scoring 2,985
http://www.videocardbenchmark.net/video_lookup.php?gpu=GeForce+GTX+560+Ti
and a 6950 scoring 3,056
http://www.videocardbenchmark.net/video_lookup.php?gpu=Radeon+HD+6950
Now, even if we were to assume optimal gain from Xfire, yielding double the score in said test, it would only result in a score of 2,292 for the 6670. I'm also not sure which version of the 6670 was used, the GDDR3 or GDDR5 version. Both cards you have linked to are the GDDR3 version. As such, that result could be higher than what you would benchmark if you were to use that software with those cards, hence those cards might be worse than what was tested.
For price, each of the 6670s would cost you $70 according to this site, adding to $140 for two in Xfire.
This is, admittedly, cheaper than both the 560Ti - priced at $200, and the 6950 - priced at $180.
As said, I haven't done my research on this site to know how reliable it is and a lot of the other results were rather obtuse in how they presented their results, so two 6670s in XFire may perform better than represented, however it seems to be an accurate enough representation based off the 560Ti and 6950, and how they score relative to each other in other benchmarks I've seen.
Choice is still there to go for the cheaper dual 6670s and get less performance [Slightly over 2/3rds the performance of the other cards], or you could get a 6950 which is $40 more expensive, as well as cheaper than a 560Ti and higher scoring, or the 560Ti which is $60 more expensive, scores slightly lower than the 6950, but has PhysX capabilities.
All depends on your priorities.