So, I have a computer I got for my birthday last year, was supposed to be an upgrade from my old one (it was OLD, lol) and it mostly has been. But so far I've run into problems multiple times attempting to run various games, and each time I've traced the issue to the graphics card that came in the new computer, which is a Intel(R) Q45/Q43 Express Chipset. I need something that can run DirectX11, and/or OpenGL 1.5 or up. I'm on a fixed income, so it can't be too expensive, and I also have a limitation that the tower was designed to sit on what's normally the side of a standing tower, so there's not a lot of space for a tall card. (An issue I ran into when I first tried to replace the card; even before I noticed the pin connectors completely didn't match the port, it was around an inch too tall to even go in.) I'd say my tower's height (the part that's normally considered width) is around.... 4 inches? I also heard something about needing a power supply that can handle said upgrade, is there any info on that I should be aware of?
I'm not highly versed in tech-talk either, so while I can mostly follow basics, and a bit above that sometimes, if I get a bunch of detailed specs thrown at me my eyes will cross trying to comprehend it, lol. Either way, I'd appreciate some advice, thank you. =)