For a 100MHz speed bump, it offers no additional overclocking headroom because it's still the same 65nm B3 core, and so the limitations are still there. Value and ConclusionsThe performance of the 7850 Black Edition is unsurprisingly underwhelming compared to the 7750 Black Edition we looked at just four months ago. Between the 7850 BE and 7750 BE, there is very little variation - strangely the 7750 used slightly more power under idle, but that could be down to a manufacturing difference because it actually drops to a frequency that's 50MHz lower than the 7850 BE's idle speed.
Under load though and the Intel 45nm CPU saves nearly 40 percent more power at stock speeds and voltages - a clear saving compared to the Kumas. The AMD 65nm K10 CPUs were never really that power efficient, and despite the Cool'n'Quiet dropping the CPU clock to half of full speed (whereas the K10.5 chips drop it further to a fixed 4x multiplier), they still use 25 percent more juice under idle than the previous K8s and Intel's E5200.
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