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Archived from groups: alt.comp.hardware.overclocking.amd (More info?)
My question is general but in my case based on the
MSI Neo2 Platinum (Socket 939) board with Athlon 3000+
Winchester CPU.
The board takes +3.3V power from the PSU and supplies
the CPU with Vcore which is in the range 1.4 - 1.6 V,
in my config.
Question: does the DC-DC conversion on the motherboard
involve any "current gain", as would be the case with an
ac transformer? Or to put it another way, if my CPU were
to use up to (for example) 60A at 1.5V, does that mean
the PSU should be rated for (at least) 60A on the +3.3V
rail?
If so, that would mean that at least half the power goes
in ohmic losses on the conversion, right? So the MB would
be dissipating at least as much as the CPU?
If not so, can one estimate the efficiency of the conversion
somehow, and hence the PSU requirements?
TIA
David
My question is general but in my case based on the
MSI Neo2 Platinum (Socket 939) board with Athlon 3000+
Winchester CPU.
The board takes +3.3V power from the PSU and supplies
the CPU with Vcore which is in the range 1.4 - 1.6 V,
in my config.
Question: does the DC-DC conversion on the motherboard
involve any "current gain", as would be the case with an
ac transformer? Or to put it another way, if my CPU were
to use up to (for example) 60A at 1.5V, does that mean
the PSU should be rated for (at least) 60A on the +3.3V
rail?
If so, that would mean that at least half the power goes
in ohmic losses on the conversion, right? So the MB would
be dissipating at least as much as the CPU?
If not so, can one estimate the efficiency of the conversion
somehow, and hence the PSU requirements?
TIA
David