i recently bought a 2nd Asus 670 gtx 2gb Direct CU II (non OC), and am experiencing wierd things.
I have a i7 3770k (stock atm) and ASRock Extreme 4 z77 motherboard, so i have two PCI-e slot's.
My 1st problem is that the lower PCI-e seated card is runnin ate least 15c hotter then the upper one. To compare, at 10% automatic idle fan speed the upper has around 30c, the lower 45c. One thing to notify is that between both cards i have instaled an X-fi sound card, which "maybe" heats the thing a bit. Still i hooked two 12cm fans to blow in the into the cars, but there is not much of a help
The 2nd problem is that in GPU-z i see that the upper card, which should run better works on PCI-e 3.0 x16 @ 8x1.1 (even with aster i start the GPU-z render test), the lower one (the hotter one) runs at PCI-e 3.0 x16 @ 8x3.0 . I Dont know what kind of performance to expect from this cards, in 3dmark 11 i got a score of 13800
The temps are listed with the side of the case opened, if i want to play games, i have to manualy turn the fan of the lower card to 90% (otherwise the card overheats! ).
Recently i bought a Samsung 840 PRO 256gb SSD to clone my old Revodrive 120gb, i had some sector and partition problems, but everything is working fine now. I am telling you this if "maybe", it has something to do with.