yes it will and especially on some multiplayer games and MMO's.
the thing is in some games that are not CPU intensive then you will massively better framerates with a better GPU but in other games where ram and CPU are reaally pushed like arma you will lose allot of performance.
this is really a game by game kinda decision
personally I would get a better CPU and then go for a used MSI twin frzr 7950 which is the exact same as a r9 280. MSI goes by the manufactured on date and does not need a receipt for a warranty or RMA claim.
If you look on ebay you will see them selling for $125 and you can find some that were made in the middle of last year which still gives them 16-24 months of warranty left.
I have bought these cards used and my daughter spilled juice on the card while it was running and they still replaced it free of charge.http://us.msi.com/page/warranty#w-vga
above is how to read the s/n. i think evga might do this also but i have never tried.
btw the one i RMA's was actually sold in korea and then made its way to the states which there policy says they will not honor but they did anyway because I bought it used in the states and that was good enough for them.