All windows and Linux versions I've run since 2008 supported 64 bit. The games I was running might not have, but I can't really be held responsible for what they want to write. Also, multitasking has always been a thing, and chrome came out in 2008 as well, so the single task 4GB limitations hasn't really been an issue for a while as far as gaming/regular desktop usage goes(unless, again, the applications you're running aren't written to support 64bit/more than 4GB, which you can't really be held responsible for.)