I understand what you are saying, but TDP cannot be reached with software, IMHO. From what I saw on my oscilloscope was basically a flat line, no matter what, with little 10-40ms spikes of current a little over 3A.
>With the majority of DC-Dc baords maxing out at 5-6 amps on the 5volt >rail , by the time you take into account an hdd and optical, plus 1-2 usb
Understood. With 2.5' HDD you will be at 3 - 3.5A. CDROM is not an 'always on' device. Something like picoPSU-90 or 120 will handle as it trips at currents greater than 8A. Continous you can do 6-7A.
Sorry, I don't have the time to do more agressive loading.
I like this board very much (D945GCLF2), I think it is superior to the VIA/C7, if you are looking at CPU perfomance and price. I can't wait to see 945GME based designs, which have at least 3x less power consumption. Fanless designs, oh yeah!
I was planning on doing these measurements, and if your test is clear enough i wont have to try to locate a DC clampmeter.
However, could you please confirm:
- your figures exclude HDD, optical, usb, fans(ie MoB only)
- if you can, document loaded and unloaded figures, and specifiy how you loaded the baord
Mike chin used 2 x cpu burn to load the cpu plus 3dmark to load the north bridge, it would be the latter i think more likely to be the issue in this case. If the i945 is rated at TDP of 22Watts, then at 5 volts thats 4.4amps compared to your 2.8 amps. Thats a resonable discrpency.
With the majority of DC-Dc baords maxing out at 5-6 amps on the 5volt rail , by the time you take into account an hdd and optical, plus 1-2 usb gadgets you are running perilously close to those psu's capacity.
Hence we need to be clear about it.
Appreciate your help with this. It will inform many many folks PSU buying decisions.