I've used Boot Camp before, in my 2008 Mac Pro and it worked well. I've decided to get back into PC-gaming and am looking again into doing this on my late 2013 27" iMac. I've got 8GB Ram and the 4GB Video Card. Anyway I have a 1TB hard drive about half of which is currently used, leaving me about 500GB free. Just wondering what you folks would advise on the partition size?