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Old 12-26-2012, 07:10 PM
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Zolishoru Zolishoru is offline
8-bit overflow
 
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So, here's the long promised report.

Hardware configuration:
MB: Intel S120KPR
CPU: Intel Pentium G2120
CPU heatsink: Scythe Mini Ninja Rev. B, no fan attached
RAM: Kingston KVR133D3E9SK2/16G, 16(2X8)GB DDR3-1333 ECC
SSD: Patrion Warp V2 32GB
KB: Logitech Illuminated, with lights turned off
Mouse: Gigabyte GM-M6880
Fans: Noctua NF-P12-1300(with ULN) and NF-P14-FLX(no adapters), both connected to the MB
DC/DC converter: WinMate DD-24AX
Power brick: Acer, 19V/130W, class IV efficiency
OS: Ubuntu 12.10 64bit
Multimeters: Tektronix DMM870(current), Fluke 75 Series II(voltage)

Results:

1.
DC/DC converter, alone, off:
19.6V*0.01A=0.2W
DC/DC converter, alone, on:
19.6V*0.2A=3.9W

2.
16GB RAM(2modules):
System on, after 10 minutes idle on the desktop:
19.5V*1.01A=19.7W
System on, after 10 minutes idle on the desktop without KB&M:
19.5V*0.97A=18.9W
System running Prime95, 2treads, in-place large FFT:
19.3V*2.29A=44.2W
System running Prime95, 2treads, in-place large FFT, no KB&M:
19.3V*2.26A=43.6W
System running Prime95, 2treads, blend test:
19.3V*2.33A=45W
System running Prime95, 2treads, blend test, no KB&M:
19.3V*2.3V=44.4W

3.
8GB RAM(1 module), KB&M attached:
System on, after 10 minutes idle on the desktop:
19.5V*0.95A=18.5W
System running Prime95, 2treads, blend test:
19.3V*2.15A=41.5W

4.
Currently used configuration:
MB: Intel S120KPR
CPU: Intel Pentium G2120
RAM: Kingston KVR133D3E9SK2/16G, 16(2X8)GB DDR3-1333 ECC
HBA: IBM M1015, flashed in IT mode
HDD: Samsung 640GB, 7200 RPM
Boot device: SanDisk Cruzer Fit 16GB USB stick
No KB&M
Booted up & idled for 15min in FreeNAS 8.3, no power management:
19.3V*1.95A=37.6W

Notes:
1.At all tests, a network connection was active(1GbE).
2.All current measurements are done between the power brick and the DC/DC converter.
3.All voltage measurements are done at the input of the DC/DC converter, after the current multimeter.
4.Ambient temperature during the tests was 22C, the CPU idled around 23-24C, and under full load was between 45-50C
5.Multimetrs are NOT calibrated, because for home use make no sense third party certifications; however, on yearly basis I compare both multimeters against a calibrated HP 34401A multimeter, to which I have access at my workplace; so far, both are within the original factory specs. Last check was in July 2012.
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