The best 4gb GPU for around $50 to $75

[FlpDaMattress]

Hello folks, A friend of mine has requested that I build him a budget gaming rig for $300. The cheapest way to do this is to buy and old Dell and throw a GPU in it, and that's exactly what I did. I already bought a Dell Vostro off Craigslist with an i5 3450, a 2x4g of ram and a 1tb HDD with only 1681 hours on it for $140. Pretty good deal if you ask me.  Problem is it only has a 300W PSU with a single 6 pin PCI-E power cable. My first though would be a 750ti but that's severely bottle necked by it's vram last time I had one last January. Any input would be greatly appreciated.

 

Obviously I have money in mind, But Texas is about to go under lock down and he's still a friend. I'm already unemployed so $100 profit here would be nice but I'm not terribly strict on that.

 

 

 

Update: Decided to go with a NEW RX460 for $89 shipped. Friend agreed to up the price to $350 if I throw in two extra monitors.

[Fasauceome]

An RX 470/570 from eBay is about the best value for a used GPU. Most models have an 8 pin PCIe connector, but the card will run in a lower power mode off only 6 pin.