Shammikit :
xKaniz :
You should be able to pick up a used GTX 480, for around $50
gtx 480 is not powerful as the 750ti right,no use buying that so.
This isn't actually true - the GTX 480 still slightly outperforms the 750ti. It's just that it's horribly inefficient as it uses about four times the power for 10-15% better performance.
Since you're buying a used GPU, it's hard to tell what will feasibly be available for you at $50. I can't imagine you do much better than 750ti at that price. But personally, I'd save up a little more and get an RX 460 before a used 750ti. Used GPUs are risky unless you're getting it from a friend, especially when you're past warranty, and the driver support going forward will be a lot worse for a 750ti.