In October, I think.
I've used several of the post-RC1 versions from torrents and they've all been fine.
Remember that they are time limited and will expire next year sometime.
None of my RC1 keys will activate the RTM Gold build 7600.
Check with MS, I'm sure they list the requirements.
Pretty much any PC you built with even semi-modern hardware would run 7.
Attaboy.
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