i5 2500K @ 4GHz
GTX 580 1.5 VRAM
16GB 1600 RAM
I would be fine at 1080p but 1440p is pretty demanding and my 580 doesn't have enough VRAM... if I knew better I would have gotten a 3GB version when I built my rig. Also one of my 580's shit the bed. I haven't done much testing to see if it's just the card or possibly the mobo's PCI-E slot got screwed.. too lazy. lol
I'm just going to deal with it. Next upgrade will be the GTX 700 series.