Power Consumption and Cool’n’Quiet technology
The practical power consumption that we measured for the reviewed CPU reached the value of 65.1W. The workload was created by the special S&M 1.7.2 utility. Let’s compare this result with the power consumption of other processors:
As we see, the typical heat dissipation value set for Athlon 64 X2 3800+ is absolutely justified. Although it consumes more power than its single-core fellows from Athlon 64 family (on Venice core), it is still a way below Athlon 64 FX-57 with the Thermal Design Power of 104W. As for the competing solutions from Intel, any comparison here would be absolutely pointless, because all Intel CPUs consume about twice as much as their AMD rivals anyway.
Of course, I should say a few words about Cool’n’Quiet technology, which the dual-core processors inherited from their single-core buddies. Athlon 64 X2 3800+ does support this technology, and its only peculiarity is the synchronous frequency and voltage reduction of the two cores in case the CPU is not loaded heavily.
In case of lower power consumption, Athlon 64 X2 3800+ drops its working frequency to 1GHz and core voltage to 1.1V. As a result the power consumption drops down to 5.8W in idle mode, which makes Athlon 64 X2 3800+ a very economical solution. In fact, they could have achieved even higher power saving efficiency if the cores could turn to economy mode independently. However, it looks like this feature will only be implemented in the dual-core processors designed for the mobile segment.