| Pemalite said: It's going to be expensive initially if those yields are bad, then again 28nm is getting fairly mature anyway so it may counteract the low-yield issue. |
The only 28nm fabs that really run are those few of tsmc. However, they operate with a still limited number of lines, and operate them for various customers (MS, Sony, NVidia, AMD, andwhatnototherstuff). So they can't tweak the lines because they have to "switch customers" from time to time. Makes yields stay lower than possible and introduces dead-times while switching (customers have to pay for that, too).
I don't think MS/Sony would find customers for "not quite working" SoC. Apart from needing completely new pc boards, no customer could rely on a constant stream of "similarly bad" chips which makes no good business plan right from the start.
