Today I was playing with my 4870 512MB card trying to lower power consumption for media tasks, internet browsing and few things surprised me!
1. Lowering 2D GPU clock below 500MHz doesn't give much saving!
2. Lowering memory clock gives huge savings!!
My measurements (read from KillAWatt after 30 minutes browsing internet thus system warmed up):
500GPU - 1025MEM = 251-255Watt
500GPU - 465MEM = 217-221Watt
170GPU - 465MEM = 216-220Watt
Looks like PowerPlay Clock Gating is working really well! On the other hand I can't see any power savings enabled or implemented for memory system.
BTW readouts were done on my system form sig underclocked to 1.6GHzCPU/2.2GHzNB on all cores and 1.1VCPU/1.25VNB.
Card flashed with ASUS TOP BIOS and tested under Vista X64 using BETA Cat. 8.8!
My conclusion is that we don't need to edit 2D GPU clocks in BIOS for power savings, we need to edit Memory clocks!
Now, anyone seen BIOS which doesn't have that annoying flickering when flashed with different 2D/3D memory clocks??
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