Upgrading GFX card in older PC

[duckfanatic]

I need advice on upgrading a GFX card in an older PC. I have a PC I built in 2010 here's the components
-Asus P6X58D premium motherboard LGA 1366
-Pentium Core i7-950 3.06GHZ
-EVGA GTX 460 1gig GFX card
-735 Watt Power Supply, and 18 gigs of ram.
Its primarily a secondary workstation for 3D modeling/rendering, video editing, and compositing. Its not used for gaming. Its actually still a pretty productive machine. I'm considering adding a new PCIe 2 4gig GFX card. Any suggestions on whether to buy a new or refurbished GFX card?

My main question is at what level does a newer card become overkill for the older components? I was eyeing refurbished GTX 660,670,680,690 cards is that the best option? Or is buying a higher GTX series or new modern GFX card better?

 

[jankerson]

I still have my machine I built in 2010 so I can relate.

I7 870.

Any of the new mid range cards will work well, RX 480, RX 580, GTX 1060.

I have an RX 480 in mine and it does fine, no bottlenecking etc.