So my computer is put together, but I'm having problems with Linux Mint

. It doesn't like the video card I got. I finally got it sorted out after way too long, then screwed it up again. Now I'm hoping I don't need to reinstall completely.
So frustrating! Why can't things just work?
Last March (over a year ago) I bought Metal of Honor Warfighter which had to be played on EAs Origin, had nothing but problems playing the game so I pitched a ***** with EA via the BBB and got my money back. Yesterday I reinstalled Origin to give it another try, same problems, well hours later dealing with tech support and finding no solution I finally narrowed it down and discovered the problem myself, it's my high end graphics card on my older system. That triggered my decision to finally upgrade my computer, ordered an AMD Phenom ii x6 processor, a new Gigabyte mobo, 16GBs of DDR 3 RAM, a 4GB NVidia graphics card and a new case, everything else I have.
The DDR 3 2GB card I currently own and the RAM from the computer will go into my wife's desktop.
I got an AMD FX 6300 chip for mine, 8GB of DDR3 RAM, but decided to go with a lower-end video card for now. I got a GeForce GT 730. Only 1GB onboard RAM, but it does use GDDR5.
If I end up needing a better card later I can get it, but I only spent $70 on the one I got. Considering how I tend to get games that don't require huge amounts of graphics power, and I'm still not sure how my games will run on linux anyway, I'm good with it.
I was able, finally, to revert my drivers and fix my problem, but wow it was annoying. Then I had some trouble installing Hearthstone, the Blizzard online card game, but now that's good, too. I'll probably be tweaking little things here and there for the next few weeks. Actually, now that I think of it, I need to go into my BIOS and manually adjust my RAM. It's 1600 but for some reason defaults to 1333.
Thankfully the testing with Mint I did prior to putting this new machine together has let me do some basic things quickly.