Nobody KNOWS any requirements obviously, but base the decision on how well GTA IV Episodes from Liberty City works on any computer you own. I've done tests on first generation PCIexpress with Pentium D, precursor of Core2 technology for Intel, and any AMD64 x2 or newer will ACTUALLY run GTA IV so there's no worry about RAGE not working on technology based on Direct X 9 or newer, but you obviously need Shader Model 3.0 on up, once you jump to newer Core2 chipsets for instance, you have Direct X11 or 10, and SM 4 on up. (some YTers have shown Intel GMA graphics trying to run GTA IV, but with some poor results, Haswell will clearly dominate in fixing the issue of onboard graphics) Also keep in mind graphic resolutions, try and run on low if you need to, it will always be good enough when frame rates are up to par!
Graphic performance is key to those factors along with what type memory is used for graphics, remember discussions about GDDR versus DDR for video, there is a clear difference.
Dedicated, or Shared System ram can help, but there is also Memory Interfacing as a factor, this is improved with later RAM, so entry and mid level systems again revert to small memory interface numbers. I mentioned early ATI or nVidia I had that was cheap actually at a 128bit memory interface, and nVidia's 8800 Ultra is above 300bits, but typically this is never all that high. 512MB for any dedicated RAM is what you should be looking for, typically you only have 512 or 1GB on an affordable budget, as options.
If you do prefer ATI all around, AMD specifically, keep in mind that AMD is and has struggled against the superiority of Intel Core tech. They still don't have a clear advantage even now, with multiple cores that seem to impress, but when benchmarked, they can't really topple Intels' 3D transister Cores now in their 4th generation.
What's confusing is that Core2 goes back to 2007. Core Duo to Core2Duo and Quad coming out a bit later.
No matter if you have that available, even a HyperThreading Pentium can do the chore, but obviously at a disadvantage, add HTT to a multiple core and you're even better suited, this allows multi threaded programmed apps, but also multiple things being done by the operator as well. More memory and more CPU horsepower are always the key factors for power users
Edited by BlackListedB, 14 July 2013 - 10:29 PM.