actually, as far as the latest leaks go the graphics will be amazing. It uses powerpc architecture all the way, were the lcache is directly writen and read from from the GPU. Plus dx10 (I think) is used. Also, each of its core has its own seperate L1 and L2 cache. So, yes... it will be faster than most modern systems AND is somewhat upgradable. There are memory modules to increase RAM. However, all though it is powerful its upgrading is fairly limited compared to a normal PC. So consoles (although this one is gonna be awesome) will always have that limiting factor. I for one plan to get one.
If you argue with an idiot he will drag you down to his level and beat you with experience.
I am not a fast writer.
I am not a slow writer.
I am a half-fast writer.