Avoid the EVGA Superclocked
http://www.techpowerup.com/166179/EVGA-Undertakes-Mini-Recall-Of-GeForce-GTX-670-SC-Owners-To-Get-FTW-as-Replacements.html
EVGA Undertakes Mini Recall Of GeForce GTX 670 SC, Owners To Get FTW as Replacements
As it was, the SC didn't compete all that well.
http://www.guru3d.com/article/evga-geforce-gtx-670-sc-review/23
EVGA SC Boost Clock is 1046 outta the box....stable at 1200 Mhz
EVGA SC gets 3DMark Score of 8691 outta the box and 9443 OC'd
Idle temp is 29C / load temp is 78C
Noise is 37 dBA Idle / 43 dBA under load
http://www.guru3d.com/article/asus-geforce-gtx-670-directcu-ii-top-review/23
Asus TOP Boost Clock is 1137 outta the box .... stable at 1280 Mhz
Asus gets 3DMark Score of 9340 outta the box and 9839 OC'd
Idle temp is 30C / load temp is 72C
Noise is 37 dBA Idle / 38 dBA under load
That makes the Asus 7% faster outta the box than the EVGA SC, 6C cooler and almost 1/4 as loud under load (every 3 dBA is a doubling of sound level). The FTW is slightly faster than the SC, leaving the Asus model w/ just a 5% performance advantage
Here they are in order of ranking by techpowerup
Asus 670 TOP - 10.0 rating
http://www.techpowerup.com/reviews/ASUS/GeForce_GTX_670_Direct_Cu_II/33.html
Gigabyte Windforce SC 670 - 9.8 rating
http://www.techpowerup.com/reviews/Gigabyte/GeForce_GTX_670_Windforce/33.html
MSI Twin Frozr IV 670 - 9.7 rating
http://www.techpowerup.com/reviews/MSI/GTX_670_Power_Edition/33.html
Palit Jetsteram 670 - 97 rating
http://www.techpowerup.com/reviews/Palit/GeForce_GTX_670_Jet_Stream/33.html
Zotac AMP 670 - 9.6 rating
http://www.techpowerup.com/reviews/Zotac/GeForce_GTX_670_Amp_Edition/33.html