After my comment in the Radeon 295 X2 review about old games for the 4K resolution test, I dug out a few to test myself in 2K resolution (27in 2K [2560x1440] Korean screen...not 4K).
Anyway, if would like to see, here are four screenshots each of each game tested:
NOTE: All games are using the "max" settings within the game, no other post setting was applied.
Doom 3 (with a few lighting mods, and .ini edit for 2K):
http://i.imgur.com/tWzbsQR.png
http://i.imgur.com/HHzmi3i.png
http://i.imgur.com/dg9fGYa.png
http://i.imgur.com/A7mi6ah.png
Quake II (.ini edit for 2K with OpenGL):
http://i.imgur.com/CMTHq7R.png
http://i.imgur.com/UIWEap3.png
http://i.imgur.com/JBr5irX.png
http://i.imgur.com/QajDZPz.png
Half-Life (the original goldsrc version):
http://i.imgur.com/L3JpS1p.png
http://i.imgur.com/sQ0KVbr.png
http://i.imgur.com/t6KGpRp.png
http://i.imgur.com/sEIcP6A.png
And for kicks, Mario Kart 64 in 2K emulation (with 16AF, 8X AA):
http://i.imgur.com/0a9nCiP.png
http://i.imgur.com/1NL4xBB.png
http://i.imgur.com/tYDsVew.png
http://i.imgur.com/R4GjPqg.png
I tried Red Alert 2, but FRAPS did not like the game, and the game would run at a mind numbing 4 fps. For a game that has a built in resolution cap of 1024x768, 2560x1440 is just a little high for their engine to draw the screen. So, no to Red Alert 2.
I'll try to get more pics of games later on.