...launch date will be June 27, 2005. Like the 3700+ and the 4000+ it is based on the 90nm San Diego core, runs at 2.8Ghz and has 1MB L2 cache as well as the SSE3 instructions.
http://translate.google.com/transla...athlon_64_fx-57_ende_juni/&hl=en&lr=&safe=off
http://www.techpowerup.com/?3498 (english site)
Not anything too mind boggling since a 3000+ can match a stock FX-55 with the right know how, but a nice addition to the single core family to go along with the release of the X2s.