AMD or Nvidia?

Nvidia for sure and EVGA for the win because of new frame metering technology. The big problem with AMD cards is micro stuttering and all their cards are just pumping out as many fps as possible. Nvidia's Kepler cards already have hardware based frame metering to help ensure that frames are displayed smoothly. click here.

is it possible to use both AMD and Nvidia graphic card on the same computer?

NVIDIA!!!!!!!! :)
My first gaming class GPU was a AMD and it worked great (for a while)... I've always had issues. Whether a bad transistor or the satuttering and tearing issues they have been notorious for imo. Anyway in my personal experience, I've always had issues with their Catalyst command programs and the equivalent. I finally switched to Nvidia when the 200 series came out and was pleased beyond my expectations. I call em as I see em and for me it comes down to personal experience. In that case Nvidia has always outperformed (even if more costly) for me than AMD. With that said, I am very impressed/pleased with AMD's latest tech vs cost vs performance ratios. So Nvidia, even though AMD has always showed promise Sorry not to technical, I'm tired lol ;)

AMD because YOLO

From personal experience, it's quite the opposite. I've had two nVidia cards, one of which lasted about a year before dying, and the other a mere 2 months before shooting up to 70°C without actually doing anything.

Now I have two AMD cards, and I've gotta say, nothing but praise for them, I've never had the slightest problem with either of them.

AMD for sure. My GT 220 died in 2 years while my 4 year old HD 3450 is still running. Also at least in my country my HD 7870 is $150 cheaper than GTX 660ti.

Nvidia. Enough Said.

why dose it seam like when ever a thread of this nature is put up, the person who created always have the same brad dino avatar?

NVIDIA!

AMD and Nvidia are both great. The only true difference between them is PhysX support. If I were you, I would go with the 7970 because it's faster.

Overclocked cards likely will not last as long, but if you can get it with a three to five year warranty that covers heat-related failure, go for it. Stock cards are meant to last 3-5 years at minimum, barring any RMAs.

amd

AMD so you can use it for bitcoin mining when you're not gaming.

AMD

whichever you choose they are bullshit. 3dfx FTW!!!

Nvidia is my choice but I do own AMD graphics cards and cpus but I still like Nvidia but for old games I choose 3DFX.

AMD

nVidia. I've had previous experiences with an nVidia card, and it worked wonderfully. I have an AMD card, and it isn't as good as the previous nVidia card.

AMD!! HD 5830-->GTX 460 overheating-->GTX 460 OC Edition Overheating after 2 year use-->Back to AMD HD 7870.... AMD FTW good bundle and cheap card.. AMD with better value.

try this

you bought ati ????? lol.