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Personally... When it comes to older systems I usually just throw in 750 ti and call it good.
The 750 ti is surprisingly powerful (pretty close to a gtx 570) without being completely overkill for setups with older CPUs that can become easily bottle-necked. They are efficient enough to be powered by the PCI-e slot alone... So no worrying about having a six pin power connector or if an aging PSU is going to have the power. And lastly they're cheap and you can expect them to keep a decent resell value if you decide to build a new system from scratch later down the road.
Check out this thread: http://hardforum.com/showthread.php?t=1837157
Guy put an R9 280 in his Q6600 system. Provided a good bump up from his old 4870. I myself just recently went from a 5870 to an R9 285. No official numbers, but seat-of-my-pants comparison says the new card is faster.
What's the rest of your system look like? Are you OCed? What PSU do you have? Do you want to stick with AMD, or are you open to nVidia too?
Check out this thread: http://hardforum.com/showthread.php?t=1837157
Guy put an R9 280 in his Q6600 system. Provided a good bump up from his old 4870. I myself just recently went from a 5870 to an R9 285. No official numbers, but seat-of-my-pants comparison says the new card is faster.
What's the rest of your system look like? Are you OCed? What PSU do you have? Do you want to stick with AMD, or are you open to nVidia too?