Saw an article a while ago about google's servers - they are packed into shipping containers...  Custom modded mATX with batteries for P/S's.

http://news.cnet.com/8301-1001_3-10209580-92.html

From one of the pics looks like they have an x16 slot (cant quite tell) - and of course this *might* be the only real valuable application where CPU mining would work -  so maybe you can read the article and figure out the hash capability per google container if they were to directly mine their cpu's  (can you say 51% attack...)

Wow - i must be bored to even be continuing this discussion