I have been using Macs since the early 90s and they have always been behind in the GPU options with PCs. Why is this? If you look at the options for GPUs for iMacs and Pro Towers for the last 10 years Apple has been offering 32, 64 and 128 MB cards for the majority of the decade -- 2000-2006. Look at the pro towers ... a 64MB card was standard for years for a 3k computer. In 2002 32 MB and 64 MB cards were what Apple offered but PCs were already at 256. And today, though not as bad, Apple is still not offering high end GPUs ... the high end GPU on the most expensive 2012 iMac is ranked #20 among MGPUs. Is this a choice by Apple or a result of they must take what AMD, etc., will offer Apple?