Okay. Thanks all. Then let's see if there's anything I can do with what I've got. I'm currently running:
LGA775 Intel Q9550 (Core 2 Quad 2.83Ghz)
4GB RAM (board max! I know, that sucks, but it should be enough for gaming)
ATI Radeon HD 5770 1GB (which appears to totally suck under Windows, even though it's working like a charm in Linux Mint)
The only faster Intel CPU that will fit the socket is 3.0Ghz. No reason to try that, even if the CPU was available.
So it looks like the only thing I could do is slap in a new GPU. Otherwise, I gotta go with a new mobo, CPU, RAM, and considering what a piece of suck the 5770 is under Windows, a new GPU as well. Right now, the game WILL play without CCC, but it isn't any fun. Without any real action, I'm getting about 15FPS (guess) with all settings at low and 768 x 1024. Also, something is going wonky with the ATI drivers because I get all kinds of screen junk under Firefox, SIW, and MWLL, and MechWarrior Online with just a tiny bit of problem with Google Chrome, though other programs give me no problem, and there are absolutely NO problems with graphics under Linux Mint with the Linux drivers for the card installed.
So would slapping a really nice new GPU into my lone ePCI x 16 slot make it fun? Or should I save up and drop more on a new mobo, mid-range CPU, RAM, and a couple of cheap NVIDIA cards with SLI? Seriously, the only thing that I want to do with my computer that I can't already do is play MWLL. That Q9550 gives me plenty of processing power for non-game apps, and I hardly ever max out my RAM.