Oh, i'm sorry. The specs were wrong. the quiet version is .63C/W, the standard is .5C/W and the turbo is .45C/W.
for a t-bird 1.1ghz at 1.8V, you would see a core temp of 39C, 32C, and 29C over ambient case temp. I hardly characterize the quiet one as one with good performance, or the standard one. The turbo is interesting, but a taisol cek734 will do just as well.
Mike