AMD is preparing to launch Phenom II X2 500 series based on Callisto and this dual core AMD’s first 45nm dual core in June. We believe that this should take place at upcoming Computex show and this should happen at some point on June 3rd.

Callisto is 45nm dual-core harvested from quad-core Deneb, where two cores are disabled. The star CPU is Phenom II X2 550, 3.1GHz clocked CPU with 2x512KB L2 cache and massive 6MB L3 cache.

The Phenom II X2 550 will launch as a Black Edition part, and it should be able to overclock just fine. There is a slight chance that with some boards you will be able to unlock the other cores.

Phenom II X2 545 has the same specs but it won’t be an unlocked Black Edition product and naturally it's clocked at 3.0GHz. With a TDP of 80W, it is not the coolest CPU around, but it should get more competitive against Pentiums and Intel’s Core 2 processors.

Regor, the dual-core 45nm native K10.5, comes in early Q3.