Sorry to say it like this, but even at that resolution, I don't think you can run on max settings. The Q8400 will bottleneck that 650 and even then a 650 is not that high on the charts. My friend owns a system right now with a Core 2 Quad Extreme (I don't remember model number off the top of my head, buts its clocked at 3ghz) and it contains a 560ti 448 core. Hes playing at that resolution and he cant even play a game like league on ultra without dropping FPS.
Your best bet is a new processor and motherboard if your wanting to game, your GPU should be enough for high at that resolution, but the CPU is going to hold games like Metro 2033 far back.
Well even then, based on what hes wanting, I dont think its still going to be enough in my personal opinion. He could do that, but I dont think it will satisfy him to the points hes saying since metro is a very powerful game.I think he is fine if he adds 4 more gigs of RAM. The 650 doesnt require that much horsepower. Extra RAM + Q8400 + GTX 650 + clean install of Windows = a eh gaming experience. Spending $20-$40 on more RAM is better than spending a ton on a new CPU.
Well even then, based on what hes wanting, I dont think its still going to be enough in my personal opinion. He could do that, but I dont think it will satisfy him to the points hes saying since metro is a very powerful game.