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For AMD, you can score used HD 7850s on Ebay for <$80, HD 7770s and 7750s for even less.
Here's some benches of the 7750/7770/7850 cards vs the 4870
7750 vs a 4870
7770 vs a 4870
7850 vs a 4870
The 7750 is very equivalent to the 4870, so it'll be slightly superior to your 4850. Used 7750s and 7770s are going for $60-$70 on ebay. If you want to get a serious performance boost, but go full on your max ceiling expenditure limit, the 7850 will really provide you with some leg room. Going with the 7850 means you get that nice upgrade and don't really break your budget.
If you go new, you are looking at an NVidia GT 730 or R7-240... *maybe* also a R7-250.
The R7 240 is a rebranded HD8650 (which is a rebranded 6650)
The R7 250 is a rebranded HD8670 (which is a rebranded 6670)
Now, here are some benches of the 6670 vs the 4870.
As you can see, you are likely *downgrading* going with a R7 240/250. Yes, those benches are against a 4870, but the 4850 was not that much slower than the 4870, and the 4870 is more than a little bit quicker than the 6670 even.
I would honestly recommend you get a used 77xx / or 78xx card if you want to get your money's worth.
I suppose..thanks guys, i like the idea of getting something used but i also came across this just now:
PNY GeForce GTX 650 VCGGTX6501XPB at tiger direct for $50 AR (including 10 off 50 promo i have on my account)
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4809392&Sku=P56-0650
would this also be a viable option?
thanks guys, i like the idea of getting something used but i also came across this just now:
PNY GeForce GTX 650 VCGGTX6501XPB at tiger direct for $50 AR (including 10 off 50 promo i have on my account)
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4809392&Sku=P56-0650
would this also be a viable option?