1920x1080 pixels. I can buy the second one but I wonder if it worth it.
If the choice is between these two cards, get the 660. People talking about CPU bottlenecking are way overblowing it. Games like graphics muscle first and foremost. BUT, you may be able to get a 7870 for around the same price which may be a better buy.
Go with gtx 660 or hd 7850.this would be best for cpu.not anything more than that
If you have a +3 GHz quad-core CPU, or SB i3 (hyper-threaded dual-core) or better, get the best GPU you can afford. In most games on the market you'll run out of GPU power long before you run out of CPU power.
I mean your processor isn't bad I feel a mid grade gpu would be more suited for it. I would definitely start looking around the haswell/ generation after that point to perhaps jump into upgrading (due to the lower power consumption, added performance). And there will be a larger jump in 2014 with Maxwell or w.e AMD has to offer then as well. So what I'm saying get a 660 to get by now when you get to the point where you are comfortable upgrading your rig get something better