AMD indeed has only one FAB that currently produces CPU's afaik: FAB30. I thought their other fab (forgot its name) is only used for flash and other products now.
Now fab count alone doesn't tell the whole story, FAB30 is a huge fab by any metric. 430.000m² in total, afaik that is far bigger than intels biggest fab, and its pretty much only used to produce CPU's; intel also produces truckloads of other products like chipsets and various other ICs.
No question though, intel has a huge capacity advantage over AMD, but this is a double edged sword: fabs are massively expensive, so it only makes sense to have more fab space if you are capacity constrained. I believe AMD is today, I don't believe intels fabs are running anywhere near 100% capacity.
Looking ahead, it looks like AMD is poised to increase its overall capacity dramatically within the next 12-18 months;
FAB36 alone will increase its capacity to ~3x what it is now (its 300mm and will be 65nm), and is supposed to go online in early 2006. On top of that, AMD has signed a deal with chartered to be able to fab additional cpu's on 90nm over there in the second half of 2006. This makes me wonder really..
AMD has publically stated they intend to have enough capacity to satisfy 50% of the market within the next (3?) years. I'm a bit confused though, because FAB36 alone would pretty much give them that AFAICS. They are now between 15 and 20% marketshare.. tripple that, and you have >50%. So it seems the chartered deal is more like a second sourcing deal than to increase capacity, quite possibly to be able to guarantee supply to large oem's that are scared by the fact AMD now relies on a single production facility.
In short: yes they are capacity constrained today. 18 months from here, they would have to perform ridiculously well to be able to sell everything they could produce.
= The views stated herein are my personal views, and not necessarily the views of my wife. =