I have built quite a few boxes for peeps convinced 64GB is big enough .... they're back here within 6 months will full C drives. Yes, you can keep a box trim enough to stick at 64 GB.....but it takes knowledge and effort to keep it that way over the life of a PC and many casual users are not up tot he task.
Lol @ Ram
I have the 5850 and have tried EVERY DRIVER, even the launch ones. No issues at all. And that's coming from a person who bought the 5850 brand spanking new 2 years ago. (Almost 2 years). So, I don't know what you're talking about.