Adding to this, some time back I read an article from a programmer about how difficult it was to make a program truly multi threaded, without going into detail you can make a one threaded program quite (in their skill levels) easily, going to two core was double the difficulty and dual threaded, but doable, after that it became extremely hard work in a sort of Universe expanding size to keep up.
I think there is a reason Intel have stayed at 4 cores for now (apart from the 6 core XEONS for a select small market) They know the market and knew AMD could not pull this off, even their projected market of Ivy Bridge will stretch to 6 cores as a max for 2012 as well.
AMD going for the first 8 core joe smuchk CPU dirt cheap seems like a bad idea in the long run ... IMHO.
Small steps AMD, not big lunges.
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