the Q8400 wins for gaming but the q9400 is a similar price these days but much more overclockable
depends on quad processor type: For example Quad Processor Q8400 VID Voltage Range: 0.8500V-1.3625V
Yes,but in low settings,if you want better settings you need a core2 quad q8400 or better.For maximum settings you need a core i7 and a gtx 260 or Ati 4870 graphic card,plus 4 gb of ram. Frankly, most modern games are GPU (graphics-card) bound more than CPU-bound. A Core i3 will easily run GTA 4 in all but the highest resolutions (1900x1200 or higher) provided it has a good graphics card - generally at least an nVidia GTX 460 or Radeon 6850. You will need sufficient RAM (2GB minimum if you run nothing else). The sad fact of the current state-of-the-art games is that they are poorly designed (from a software standpoint). Very few scale well with added cores (most barely use two cores well), and are notoriously poorly multi-threaded. Very, very few games really can make use of a Quad-core system - in fact, most games which "recommend" a quad-core system do so not for the game, but so that the game can have two cores to itself, and the additional cores run system or other apps. Now that most GPUs include physics modeling support, the vast majority of work in a modern PC game is done on the GPU, with the CPU generally being much less loaded (often, doing "housekeeping" functions and audio, and little else).