An over abundance of ram is like the polar opposite of a bottleneck. Mostly proccessing elements get bottlenecked .They can be bottlenecked by insufficient caches, by insufficient memory, by a lack of bandwidth, etc.So you're saying if I build a system with 24GB of GDDR5 RAM and a 5450 that RAM won't go to waste?
But none of that applies here.
With 8gbs of ram, there will be plenty of room for caching. I expect alot of games on both systems to stream from RAM. And that's without saying that we have no idea of what Sony has in place for HDD or what if any performance penalties it has.Where do you think game assets load from?
Developers had better master streaming everything during gameplay if they want to clamp down on load times.
I think the HDD comments are mostly people grasping for straws to say the guys wrong or just throwing shit at the wall to see what sticks, or both.