NEVER EVER XFX!
NEVER EVER XFX!
NEVER EVER XFX!

A lot of the mining comunity says to stay away from them and so do I 3 out of 4 cards from the (7950) died withing 2 months (stock 100% fan) and they were LOUD, HOT etc, and only 550-560K/hash.

The 270 is the BEST Hash/$ BUT needs a bigger investment as it requires more risers and more PSUs and it also uses more power over all.

I just built a rig with 4 270s (4 of those or 2 280xs) The 270s net me 1.8M/hash while the 280Xs would only net me about 1.2-1.4M/hash
I spent £820 on 1.8M/hash for the 270s BUT for the 280Xs I would have spent about £770 for 1.2-4 M/hash (so set up is more expensive but not much)

I got the gigabyte 270s as they have 2 6 pins which allow for HUGE OCs (all the sliders to the end of after burner and further after unlocking OC limit) and they hash at 450+ avg all day long. The cards each came with a battlefield 4 game and I can sell them on eBay for £20 each(in the next week) that will lower the cost per card down to £110 each which isn't bad for 450+K/hash.

So my favorite cards at the moment are MSI (4 280Xs in another rig before I learnt about the 270s) and they have been going about 2-3 months no problem and the gigabytes have been with a giant OC for about 3 days stable, no faults.

1 last thing, the 290x might be a powerful card BUT the hash/$ is SHITE compared to the benefits of 2 280xs or even 4 270s (for the same cost of 1 290x)


EDIT-7990s are really expensive, but they do offer a great hash rate (but again the 270s offer better hash/$) and also the 7990 are EOL too so they are fading out, they RUN HOT and LOUD and DRAW A LOOOOOOTTTTTTT OF POWR