DSzymborski :
kevinakerberg :
clutchc :
That will depend on the PSU you have; not just total watts, but the +12V rail specs.
But anything beyond a R9-270X/GTX 950 will start to be bottlenecked by the CPU.
I have a 500w raid max psu. Here's the link if you need it: http://m.newegg.com/Product/index?itemnumber=17-152-060
While you could use a 750ti, I wouldn't personally trust any of my parts with such a PSU - Raidmax is one of the notorious bottom-of-the-barrel junk PSU brands we try to steer builders away from.
I see. I finished my build a few months ago and the power supply has been working fine. Nothing out of the ordinary. Will it damage any of my parts in the future, particularly a new graphics card or something else important?