But how many games will take advantage of that? That requires programmer time and lots of testing just for the >5% of people that have high-end hardware. I think graphics were good enough on the GC, (think Mario Sunshine) which had old hardware relative to PCs, and it's only the trend toward ultra-realism that's needing even current midrange PC hardware.
Ubuntu. Linux for human beings.
If you are interested in trying Ubuntu or Linux in general, PM me and I will answer your questions and help you install it if you wish.