Canon 650-4ti owners, what computer system requirements are needed?

Software will run BUT will be a little slow when it comes to processing and ram but it will work and as to the previous post, Windows 8 works GREAT and if you have a good pc it smokes windows 7 by a long shot. My load up time for Photoshop CS6 is less that 3 seconds with all plugins and I do have quite a few as opposed to win7 where the load up time was significantly slower. My setup is a quad core i7 32gb ram.. 60gb SSD.. 8tb storage and dual 23' LCD's. My other pc is an old one with 1.5gb ram and of course a little slow but it still does the job even with CS6. Lightroom 4.2 ran fine on the old pc and yes a little slow but still worked ok for me.

An upgrade would always help but your 650 will do fine with what you have until you can afford a better pc.