HI, do not understand this. This mean that a normal PSU could have similar power efficiency than one of those external adapters? I always have suppose that they put the power efficiency of the whole pack, not only the connector.
Well, not normal. Depends on the PSU.
PSU are rated for 20% to 80% efficiency.
If you have an older bronze, or only 80% rated PSU, the efficiency drops off quite rapidly at the under 20% utilization.
Say you are pulling 40 watts at idle and 80 watts at full load and your 350 watt is an average bronze rated unit.
SeaSonic SS-350ET Bronze 350W ATX12V V2.31 80 PLUS BRONZE Certified Active PFC Power Supply - OEM
http://www.plugloadsolutions.com/psu_re ... Report.pdfat 80 watts you are at something like 84% 80/.84= 95 watts at the wall
at 40 watts you are at something off the chart...and it drops rapidly..my guess less 78% so 40/.78=51 watts at the wall.
To get the 85% of the PICO/brick...you need to have a PLAT rated PSU at these low watts.
I always have suppose that they put the power efficiency of the whole pack, not only the connector
Sorry, no.
The 96-98% you see is just the conversion of the DC-DC of the PICO attachment.
You need to look at the AC-DC conversion at the brick to figure out the efficiency of the entire system.
But like I have shown, 85% is pretty good for these low wattage application. You might do better with higher cost more efficient bricks, but there isn't a huge demand for these.
People tend to either buy a complete system or build a power gaming rig...just not a huge market for the DIY Micro computer system.....
Hi, thank you for your advice. I had read about this problem when dismount a PSU so my idea was simply to cut the fan cable from the outside.
and leave live wires uncapped to short out...really bad idea.