Upgrade suggestions. (old pc)

miit123

Honorable
Oct 31, 2013
446
0
10,860
These are my specs

E7200
Gigabyte ga-g31m-s2l
350watt PSU
4GB DDR2 RAM

So this is a 7 year old pc and I would like to upgrade this. Please give me advice for upgrading.
I would like to add GPU first. Plus, will 750ti work on 350 watts? Whats the best GPU I can add on to this system?