Right before Christmas the French tech magazine CanardPC published the first Ryzen preview and showed the performance of a 3.15GHz eight-core engineering sample. The author of the preview is the same person who scored an early sample of the AMD K8 over a decade ago so there's reason to believe the numbers are legit.
Now the website claims AMD recently started sampling B-stepping quad-core versions of Ryzen with disabled simultaneous multithreading (aka HyperThreading). The site says these 4-core, 4-threaded chips have a 65W TDP and thinks they may be part of the upcoming Ryzen lineup.
CanardPC admits they do not have further information about the Ryzen launch but the site speculates mass availability of Ryzen seems hard before May. A lot will depend on the yields.
AMD a commencé à sampler des Ryzen 4C B-Step (prod) avec HT désactivé. Possible qu'on les retrouve dans la gamme commerciale.