"Micha Schöler" said:
Hi Evrybody, can anybody tell me, how the A7N8X v2.0 mainboard generates the
CPU voltage of 1,6V for the Barton 2500+? Cause since i replaced my Athlon
1200 TB by th Barton my 5V rail is about 0.1-0.125V lower than before.
(about 4,75V when running Prime95)
Greetings Micha
Most modern motherboards generate Vcore from +12V.
At the power supply end, there are two kinds of designs. The traditional
multi output power supply has one regulation circuit, and multiple
output circuits. The ratio of the voltages of the outputs is fixed
by the turns ratio of the output transformer. I thought that this
cheap idea died years ago, but the schematic on this web page
shows that the idea is still around.
http://www.pavouk.comp.cz/hw/en_atxps.html
A characteristic of this kind of design, is a load on one output
may result in another output drooping as well. That may be what
you are seeing.
There is at least one power supply that claims to have separate
outputs - the Antec Truepower series. There may be others.
HTH,
Paul
