minimum system requirements here:

http://www.corel.com/corel/product/i...KSEMGglBR#tab7

the program has 64bit support on windows [but i am told not on a mac] so 64bit windows should be better for this program, but whether to go 64bit is a wider issue

it has multiprocessor support for brushes

note: if you stay 32bit the program will only access 2GB memory max - but as I say, if you are upgrading you need to check everything else out for 64bit suitability not just painter

hope this helps