Graphics Card Reccommendation.

Solution
Lol 😛. Well you could add a HD7770 or 650ti on this PSU i guess, but that's the highest you should go. I wouldn't go any higher with this build anyway, you could also save some money for a completely new build.
Lol 😛. Well you could add a HD7770 or 650ti on this PSU i guess, but that's the highest you should go. I wouldn't go any higher with this build anyway, you could also save some money for a completely new build.
 
Solution
300w is sufficient for a 7750 and cpu, his current GPU is also using about that wattage so yeah why not. What other components are you thinking of that use that much power?

CPU uses 125W
GPU 75W
roughly 80w left for system to function should be more than enough.