Hi, all silence lovers. Did some energy consumption measurements of my home setup. These were the objects of interest:
1) Biostar G31-M7TE (1.18V on GMCH)
2) Intel E5200 2,5GHz (1.1250V)
3) Patriot EP 2x2Gb DDR2-800 CL5 (1.85V)
4) Force3D HD4670 750(1.3V)/2000MHz(1.8V)
Pls note, that both ODD and HDD drives I have supplied bypassing our field of test. So we will only receive results of motherboard, CPU, RAM, and video. Measurements were performed in DC area, so we must add to our findings some losses based on imperfect efficiency factor of the PSU too.
Measurements were done by the means of an analogue amperemeter (well, galvanometer plus shunt resistor, actually) I used to use in my homebrew experiments. I believe it has enough accuracy for this one too. Of course, I have a digital multimeter, but here I took the analogue device, cause it's good for showing an average value.
Now conditions. The idle is idle. No special peculiarities here. Intel's SpeedStep enabled -- multi drops from 12.5 to 6, ATI PowerPlay functioning -- 750/2000MHz -> 165/250MHz. There is also nothing launched in Windows besides the needed applications such are Linpack, Prime 95, and ...Flatout Ultimate Carnage. The choice is conditional on the state that we must generate as much heat as possible. E.g. Prime 95 just loves to load the +5V rail, and Linpack is unsurpassed for +12V, doing this better than well-deserved Prime 95. And concerning video part nothing can load so much your compie as, yes, a game. So in 3D load scenario I was launching the Flatout game (~35-40FPS on maximum detail). Well, so much for conditions, let's go to figures (are given in Watts):
And some additional information.
1) Take a note that the present G31 GMCH is a bit undervolted (done through simple pencil trick) -- 1.18V instead of 1.28V stock by Biostar (and 1.25V by Intel). This drop down of 0.1V brings 1.3W economy in idle, and 2W in load (+5V rail impact only). I just forgot to remove the mod before our test.
2) If we pull out one RAM stick, we earn 2W in idle, and 4W in load (+5V rail impact only).
3) Raising the default frequency of E5200 up to 3GHz (on the stock VID 1.1250V) gives consume increase by 0.2W in idle, and 6.4W in load (+12V rail impact only).
4) If we decrease the E5200/2.5GHz VID to a bit low value -- 0.9250V -- it gives us a drop of 1.8W in idle, and 11.4W in load (+12V rail impact only).
5) The +5Vsb rail consumes 1.25W in standby, and 0W power on (insignificant -12V I have skipped).