This(ish). Just because you don't get a beta invite does not mean your PC can't run it; it most likely means the opposite, Not only do they want to test vast arrays of setups, they want to test the setups that borderline their specs to more accurately portray what is needed to run the game well.
So if you never get beta invite, Don't buy diablo3 till you get a better computer. I hope diablo 3 is still good a year or some from now. I am too broke to get a new computer.
Thank you for giveing us the heads up.
its mostly the opposite
they want people with older computers because most people have newer versions of stuff