Bought a used R9 280x on eBay and I would like to know how I can tell if there's a problem with the card. PROBLEM 1 - Mac 3,1 - was running 10.6.8 and just upgraded to 10.8.5. Installed the graphics card and all seemed good initially. Got picture on all ports. Then I went into a FCP7 project where I had experienced some video tearing with my original card, GT8800 (?) 512mb and the tearing is much worse now! This was really the reason I upgraded, to handle video in my editing software better. The picture is also tearing in Avid, (DNxHD36 media), which it never did with my old card. The FCP clips are Pro-Res. This is happening using the miniDP ports to an HDMI input on one monitor and DVI on the other, single cables for both, no additional adapters. My monitors are 8 years old, nothing special, Acer P241W. I've searched to see if I need drivers but from what I've found I shouldn't need any unless I'm on an older version of OS X. Is there anything I need to do when installing this card to ensure that it runs fine? What is the best way to test this card to see if there is a problem with it? And I don't know if this is normal or not, but the card is listed twice under the PCI Cards category with different info regarding drivers, see pics below: I never played the video after updating to 10.8.5 and before putting in the new video card so I will try putting the old one back in and see how it acts, but I'm hoping to find out I just need to install a driver before I go through the hassle of doing that. PROBLEM 2 - Another thing that is happening is that I've changed the resolution and the desktop pics and it doesn't stick after I change the ports I'm using on the video card. Last night I checked the DVI and HDMI ports, changed the desktop pics and resolution. Today I hooked up the monitors to the miniDP ports and one of the desktop pics changed to what I think is a generic ML pic used. Then I shut down, swapped the cables on the ports on the GPU and rebooted and the desktop pics were back to what I had put them as when I was on Snow Leopard and back to 1920x1200 resolution. Is this normal??? Any help would be greatly appreciated as I need to deal with the seller if the card has issues. Thanks! p.s. Side question... on the outward edge of the card, opposite the side that is inserted into the slot, there are two little 'things' that were covered with a rubbery/plasticky cap. I assume this is for SLI? Should I leave that cap on or take it off?