answer:PCI-x slots are a standard slot, and entirely different from any other slot. It’s always the top-most slot when looking at the back of the computer, and they put it there for the best cooling. So long as you get a PCI-x video card instead of an older AGP card, you should be fine… and considering that >95% of the cards on teh market now are PCI-x, it won’t be that hard. However, one thing to watch out for is finding a video card that is powerful enough to be an improvement while not being so powerful that it burns out your power supply. A high-end card can draw more watts than a stock power supply puts out, leaving nothing for the rest of the computer. If you get too high-end a card, you will need to replace the power supply! My Gateway got a 600W Cooler Master; twice as powerful as the stock unit, with plenty of headroom for safety. A related secondary concern is getting a good value; there is a world of difference between an $80 card and a $100 card, but relatively little between a $150 card and a $300 card. At present, my personal favorite is the R7 260X. It’s a moderately powerful card for a moderate price, and should be just low enough to not require a power supply (though, if you want to game much, I’d recommend plopping another $80 or so on a good, name-brand 450–600W PSU. Actually installing the card is simple. The difficult part is choosing the correct card. * * * 8GB is plenty for gaming and watching videos. HD image editing would benefit from more RAM, but I do all that stuff just fine on 6GB. How many mega-pixels are your images? * * * Your CPU is twice as powerful as mine, yet I still manage good framerates at 1920×1080 simply because of my video card. I wouldn’t worry about your CPU or RAM, only the video card, the power supply, and cooling. Many people think they need a more powerful computer when, in fact, they often have a computer with more power than they need that is merely hobbled by a bad video card.