Replies to post #28259 on Advanced Micro Devices Inc (AMD)

[Dan3]

Re: A memory interface burns a *lot* of power for
a mobile chip because it generally doesn't scale down in
frequency with the CPU and it never scales down in voltage.

Glad you brought that up.

Really! Delighted!

With every access to main memory Banias has to burn power from:
CPU to chipset
chipset to RAM
RAM to Chipset
Chipset to CPU

All at those "doesn't scale down in frequency/voltage" loads.

AMD's mobile chips, OTOH, burn power from:
CPU to RAM
RAM to CPU.

Thanks again for focusing our attention on that!

:-)

[j3pflynn]

chipguy, that's a good point(increased memory access), but on the other hand, K8 doesn't have the power drain of the NB, either. The best we can hope for in a comparison are two systems, preferably from the same OEM, with the same components and MBs that have the same feature set, and then look at total power used in all diferent situations.
Paul

[dougSF30]

Too bad that notebook dissipates no more power than a similarly outfitted Banias, isn't it? Kinda blows your theory.

Doug