Intel just released the v3 (Haswell based) of the Xeon E5 2600-series which was supposed to include the TSX (Transactional Synchronization Extensions) of the Haswell architecture but because there was a bug in the implementation of TSX, the feature will be disabled in the first stepping.
How long does it usually take for Intel to prepare a new stepping?
How long does it usually take for Intel to prepare a new stepping?