Archived from groups: alt.comp.periphs.mainboard.asus (
More info?)
"Paul" <nospam@needed.com> wrote in message
news:nospam-2407041907140001@192.168.1.177...
> In article <F8zMc.22225$Fj6.14302@lakeread07>, "Norm" <I'm here@here.net>
wrote:
>
> > I recently upgraded to a Barton XP3000+ ... I'm not real happy with the
> > temps. I was led to believe the Barton's ran cooler than the
Thoroughbreds.
> > My temps raised +5 idle and +8 load. (High 50c). My HS is a Volcano 11
with
> > AS5 compound, Antic p160 case with 2x120mm fans, front and back, I have
dual
> > fan power supply. Running at 400FBS
> > I was thinking about changing the HS, but the Volcano 11 is rated
AMD3400+
> >
> > Any suggestions would be helpful
> > NC
>
> There is some info here:
>
http://www.qdi.nl/support/CPUQDISocketA.htm
>
> On any processor parameter, there will be variation from unit to unit.
> In fact, on the production line, some of the processors are "harvested"
> for mobile use, due to their lower dissipation and ability to run
> with less Vcore and still pass all test vectors.
>
> If your previous processor was on the "good side" of the distribution
> and the new processor is on the "bad side" of the distribution, then
> the new dissipation might be higher. If the die area of the processor
> is different, then if you are using the same heatsink, the thermal
> resistance to the processor will be higher, if the new processor
> has a smaller die.
>
> You should also check the measured Vcore, as power is proportional
> to F*C*V**2, where the "V-squared" term is the Vcore voltage. Some
> Asus boards are notorious for overvolting, even when the Vcore
> is set to "Auto".
>
> Finally, you should be using the delta between CPU temp and case
> temp as a metric. Case_temp + Power*Thermal_resistance = CPU_Temp.
> If the case_temp is not the same in your two examples, then
> you need to factor that in. You should be comparing
> CPU_Temp - Case_temp for the two computers, as a means of
> roughly comparing performance. As I said above, if you were using
> the same HSF for both tests, a difference in die area can influence
> how effective the HSF is, and you might need to correct the
> results slightly for that.
>
> In the P4 world, life is much easier, as you can simply stick
> an ammeter in the +12V feed, and measure the power that way.
> You can also do this on an AMD board, or any other board for that
> matter, by removing the "high side" inductor in the Vcore circuit
> and placing the ammeter in series with it. There is a fair
> amount of sawtooth ripple in the signal, so in fact an oscilloscope
> and precision shunt resistor is probably a better way of getting
> at the truth. I use a DC clamp on ammeter with Hall probe to do this
> measurement, and even though my meter is "True RMS", it doesn't
> have the bandwidth to do the measurement properly. A typical meter
> might have a 50KHz bandwidth, and the switching waveforms run from
> 200KHz and up. That is why snapping a pic of the current waveform
> with a scope makes the job of measurement easier to verify for
> correctness.
>
> HTH,
> Paul
LOL
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