Lol a 270x would be insane overkill :D
If you wanted a 270x, you'd probably need a 650w+ PSU. My PC has an AMD XFX R7950 (older, although still similar in terms of specs), and I max out at around 620ish watts of usage on full load, which is too close to my PSU's limit to warrant an upgrade.
Anyway, to get back on topic: if you're looking for any sort of high-end GPU performance, you'll have to upgrade your PSU to around 600 watts, and even then there's no guarantee that your CPU or even your RAM won't be a bottleneck (while you don't really need more, you wouldn't want any less either).
Based on what I think your current specification is likely to handle, I'd say that the AMD XFX 7750 is probably one of the best things you can get for your money ($86.99 after a rebate on newegg, since afaik you're american *sorry if i'm wrong*) - you get a relatively decent framerate and it only consumes 55 watts of power.
You could try the GTX 650, but that consumes almost 70 watts (okay, it's still not massive, but yeah). Only thing I'd say when comparing the two from my own standpoint is that, being an AMD owner, I prefer Nvidia's drivers.
Although before you make any type of purchase, it's important to research which PSU you have. Just to be safe.
If you wanted a 270x, you'd probably need a 650w+ PSU. My PC has an AMD XFX R7950 (older, although still similar in terms of specs), and I max out at around 620ish watts of usage on full load, which is too close to my PSU's limit to warrant an upgrade.
Anyway, to get back on topic: if you're looking for any sort of high-end GPU performance, you'll have to upgrade your PSU to around 600 watts, and even then there's no guarantee that your CPU or even your RAM won't be a bottleneck (while you don't really need more, you wouldn't want any less either).
Based on what I think your current specification is likely to handle, I'd say that the AMD XFX 7750 is probably one of the best things you can get for your money ($86.99 after a rebate on newegg, since afaik you're american *sorry if i'm wrong*) - you get a relatively decent framerate and it only consumes 55 watts of power.
You could try the GTX 650, but that consumes almost 70 watts (okay, it's still not massive, but yeah). Only thing I'd say when comparing the two from my own standpoint is that, being an AMD owner, I prefer Nvidia's drivers.
Although before you make any type of purchase, it's important to research which PSU you have. Just to be safe.