AMD has just launched its 40W ACP six-core Istanbul CPU and this should be the most power efficient six-core to date. 

  The official name is AMD Opteron 2419EE, product number OS2419NBS6DGN, and we are talking about the D0 revision of the Istanbul core. The amazing thing about this CPU is a typical 40W wattage or ACP as AMD calls it, and this consumption translates to 60W TDP. 

The core speed of AMD Opteron 2419EE us 1800MHz and the CPU needs 1.125V to work. It has 6x512KB L3 cache, 3MB altogether, and the integrated memory controller works at 2000MHz.

AMD Opteron 2435 at 2.6GHz has the same spec and can work at 75W ACP/115W TDP, which is also not that bad to begin with. Overall, the goal of Opteron 2419EE is to shave off a few digits from the power bill and enable use in blade-servers where heat matters. Bear in mind DDR2 memory is definitely cheaper than Intel’s DDR3.