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powersaving_a7v333 [2013/01/15 15:04] krakonos created |
powersaving_a7v333 [2014/11/23 16:29] (current) krakonos |
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====== Power savings on A7V333 ====== | ====== Power savings on A7V333 ====== | ||
I have some old 320GB hard drives for some time now. They are all IDE and all unused. I decided to make some backup machine which would sit at home and be handling daily backups. Here is what I have: | I have some old 320GB hard drives for some time now. They are all IDE and all unused. I decided to make some backup machine which would sit at home and be handling daily backups. Here is what I have: | ||
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==== ACPI power saving modes ==== | ==== ACPI power saving modes ==== | ||
- | Next I wanted to gain some power savings via software, via cpufreq or the like. It turns out that the board is not supported by cpufreq, possibly not even by APM (did not tried). There is however a tool called LVCool that should do it for these chipsets. Unfortunately, | + | Next I wanted to gain some power savings via software, via cpufreq or the like. It turns out that the board is not supported by cpufreq, possibly not even by APM (did not tried). There is however a tool called LVCool that should do it for these chipsets. Unfortunately, |
==== Undervolting ==== | ==== Undervolting ==== | ||
- | It is only natural that so underclocked system would not need the default 1.75V. After googling a little bit, it seems that these CPUs can run @1.6GHz with 1.5V! Unforunately, | + | It is only natural that so underclocked system would not need the default 1.75V. After googling a little bit, it seems that these CPUs can run @1.6GHz with 1.5V! Unforunately, |
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+ | It seemed to work fine, but sometime during emerging stuff (relatively few things, lzo & openvpn for example), the gcc would segfault on different places. I decided it is time to volt it up back to 1.5V. Segfaults vanished. | ||
^ Voltage ^ Jumpers ^ | ^ Voltage ^ Jumpers ^ | ||
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| idle, plain | 121W | | | idle, plain | 121W | | ||
| underclocked to 1.2GHz | 101W | | | underclocked to 1.2GHz | 101W | | ||
- | | underclocked + athtool | + | | underclocked + athcool |
- | | underclocked + athtool | + | | underclocked + athcool |
- | | underclocked + athtool | + | | underclocked + athcool |
+ | | underclocked + athcool + undervolt + 4 hdd powered down, usb keyboard unplugged | 42W | |