The RAM voltage on K8 stays the same, same thing as on Phenom. But the main thing which makes the power difference on Phenom as I formentioned is CPU/NB voltage rather than frequency. Frequency won't give you massive losses/gains in power consumption, but voltage will.
I had the same issues, honestly. Before trying X2 I was running stock volts at 2750MHz. Now I need +0.2V for stability and the max clock stable/instable has fallen down by 100MHz.Here it got worse, after playing with BE-2400 for two days now the phenom requires 0,25-0,5V more for overclocking, trying to get it stable at 223 ht atm.
Saw you tried the 5000+ BE and must agree that those G2 cpu's are more fun to play with. Thought max ht ref for my board is ~290MHz, found that it can run up to ~340MHz with BE-2400. Run's stable with 10,5 CPU multi and 305MHz ht ref.
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