http://forums.anandtech.com/showthread.php?t=2331591&page=2
Just to put things in perspective, the consoles that will save AMD, assuming a linear 10% decrease in sales and flat gross margin for all other AMD business units, will give the company some 1 billion in revenues per year but only 24%* gross margins. And this is year 0, when the price of the silicon will be higher. It doesn't get any better from here.
Sure, it isn't bad when you think that there will be practically 0 expenses from now on, but you can't fund a x86 business with this punny cash flow. This is less than AMD got with Brazos.
(If you assume that everything else will be flat and add the projected revenue increase and apply the forecast gross margin, the custom silicon will have a whopping 7% gross margins. As Haswell arrived in Q2 and Q3 it's not far fetched to project a 10% drop in everything else and take the 24% gross margin.
Alternatively, if you want to day dream with AMD custom silicon above 40% gross margin, other business units will have to take a drop of 20% in their gross profits)