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Current measurements on powersupply P4 pin

For those who want too place smoothing caps on the power supply line to smoothen the ripple voltage.

When placing smoothing caps, one needs to know (or guess) the current and the estimated ripple voltage on that supply line. The ripple voltage can be found in product reviews on the www. The actual working current has to be measured.

In some posts I saw measurements of the current on the P4 pin of about 0.7 amp when working. And 1 amp during boot and startup.
I found these mentioned currents very high. So I measured them myself.

Mobo: Gigabyte GA-G31M-S2L Bios F9
Intel: E7200 core2duo CPU ratio: 7 Busspeed: 160 CPU voltage: 1.0000 Volt

Readings when playing music:

Foobar2000
SRC 96000 0,35 - 0,36 amp
SoX 96000 0,26 - 0,27 amp
PPHS 96000 0,25 - 0,26 amp
--- 44100 0,24 - 0,25 amp

cPlay
SCR 96000 0,29 - 0,32 amp
--- 44100 0,24 amp

When CPU voltage is lowered to 0,90000 volt than all readings are 0,04 amps less.

Playing dvd’s with GOM player uses 0,27 – 0,29 amp.


How the measurements were done:
A NAIM Hicap acts as 24 Volt power supply.
The 24 volt is fed into a dc-dc adapter to make it 12 volt.
Then this 12 volt is fed in to a DC-DC ATX power Supply
(http://www.mini-box.com/PW-200M-DC-DC-power-supply)
The PW-200m only powers the processor through the P4 pin.
The multimeter was placed between the HICAP and the 24/12 dc-dc adapter.

Other power sources while the PC was working:
The mobo pin20/24 pin is powered by an Antec EarthWatts 430.
Sphericals (HDD, USB-ports, DVD, etc.) are powered from an external PC power supply outside the PC-case. (In: ac 230 V, Out: dc ± 50 W, 5 V / 3 A, 12 V / 3 A). I don’t mind DC wires inside my PC. But I definitely do not like 230 Volt AC wires inside the PC near mobo, soundcard, etc. So I didn’t choose the granite mini power supplies.

The PC is calibrated according the art of building computer transports except for:
- the network is still working
- the video is still working (1920 x 1080 ) and displaying too Sony Bravia KDL-32W4000
- EIST function is off. Corresponding XP power settings are also off.

ESI juli@ or LynxL22 dig i/o -> Lavry Black DA10 -> Mogami Gold -> Klein & Hummel O300


Edits: 04/06/09
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