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Further reduction in Video hardware acceleration

Learning to permanently underclock CPU (at constant 1.13v core voltage), allows for an optimization I originally wanted but wasn't totally successful with. Permanent underclocking (or undervoltage) has made this optimization possible.

Currently, in 4.3.c, video acceleration is one notch before 'None'.

Change this to 'None' (leftmost setting) and leave 'Enable write combining' unchecked. In a well tuned system there should be improvement. You should notice a 'slow down' on video performance (e.g. doing rapid scrolling) as mobo video chipset is now disabled. Basic video functions are done by CPU so avoid busy visuals during Foobar playback, e.g. disable spectrum analyzer.

Technical Background: Previous attempts resulted in higher v-core (1.16v-1.28v) with more frequent voltage transitions. During playback, v-core was weighted towards 1.20v (vs 0.15v). So whilst benefits of disabling mobo video chipset is good (eliminates its emi/rf radiation and overall power consumption drops), CPU gained 10-20% more load that resulted in greater power consumption (as v-core was higher). Basically, no sound improvement.

With permanent underclocking, CPU power consumption remains unchanged (as v-core stays at 1.13v) with extra workload. Hence, disabling video chipset becomes beneficial. You can see this using supplied mobo monitoring utility (ITE Smart Guardian) by changing power scheme back to 'Home/Office Desk'. Remember to set power scheme to 'Portable/Laptop' when finished.

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  Kimber Kable  

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  • Further reduction in Video hardware acceleration - cics 05:19:14 04/10/07 (0)
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