Five finger discount Athlon II
making a habit out of launching crippled CPUs that can easily be
unlocked to provide access to a disabled core. We saw it with
triple-cores, and now it appears you can get an extra core on the new
Sempron 140 as well.
The Sempron 140 is a cheap single-core part, based on the Sargas core,
which is in fact a crippled Regor dual-core. You just need a
motherboard with an AMD SB710 or SB750 sourthbridge with support for
the Advanced Clock Calibration and you should be able to turn your
Sempron 140 into an Athlon II X2.
This basically means you can get a dual 45nm processor clocked at
2.7GHz for $39/€29, which is truly great value, especially considering
it's rather OC friendly.
You can find some screenshots here