OP, I have a lot of experience with your specific CPU (it's on my parents spare computer, which I've upgraded to be a real basic budget gaming machine when I'm there), and it's going to bottleneck any real GPU massively. Being a prebuilt, you can't even OC that chip (they'll hit like 3.6-4 easily, depending on whether you want to change voltage or not). Forget replacing the PSU. If HP even
makes a higher capacity PSU, and they may well not (no real reason for them to go through the trouble for the 0.1% of the market who might buy it), it would be exorbitantly expensive.
A 7750 or GT 240, or maybe a GT630 or 640 on the gree side (you can find the 630 in low profile) is the highest end you want to go, and with that you might, MIGHT, hit 15fps. CPU bottlenecks cannot be detected merely by measuring CPU load, and that Athlon II X2 is going to struggle to even achieve that framerate, but it might. You'll have to stay in the power envelope and space requirements of a low profile machine
so I'd get something like this:
http://www.newegg.co...N82E16814121799
With a TDP of 30w, you can probably just about afford it, power/heat wise and it should physically fit. It will allow MWO to run on mediumish settings, probably dead medium at the best framerates your CPU is going to manage. If you were willing to consider a new CPU, your options might get better. Even pairing that GPU will a better CPU, and Athlon II X4, or a Phenom II X4, would keep you at mediumish, but your framerate would go into the 30s instead of the teens. Pair it with a low-profile cooler, and you have more robust option, with a warning that that HP PSU is never going to stop being problematic, no matter what upgrade path you choose. It's probably struggling to power the machine as-is, as I've seen HP PSUs die in stock setups many times after a few years.
You could also get a new case and a normal PSU to dump the HP guts into, but at that point, you might as well save for a new computer, which is honestly the best option, IMO. I don't know what your financial situation is like, but if you spent the few bucks on the R7 240, then just started socking money away, you could have a pretty decent machine on like $600, maybe even $500. This is the option I would recommend.
If you didn't care how it looked and you didn't move the machine much, you could also mod your case to take a full-sized card (5 minutes and a dremmel tool) and get a standard PSU that just sits outside the case, then get a Phenom II X4 965 and something like an R9 270 or equivalent (including Nvidia cards, or older cards from either company that might run cheaper on the used market, like a 5870). You'd have to run the machine open-panel, which isn't ideal for cooling, but it would work well enough for modest power stock parts. It it not the option I would go with, but it is the DIY option that would give the biggest bang for your buck. You could probably entirely overhaul your machine into something decent for like $200.
Edited by Catamount, 23 April 2014 - 07:00 AM.