Cheap PCs from Wal-Mart
math at velocet.ca
Mon Jun 2 22:40:09 EDT 2003
On Mon, Jun 02, 2003 at 03:25:47PM -0700, Jim Lux's all...
>Which P4 and Athlon were you comparing..
>I went to the linked page at Toms Hardware and found reasonably close results
>Athlon XP 3200+, and P4 3GHz...
>Now, what's the power consumption of those two?
>I think the P4 dissipates a max of 85W (poking around on the same Tom's page)
>The C3 at 800 MHz dissipates 6.65W average and peaks at 12W
>The Nehemiah at 1 GHz dissipates 11.25/15 W ave/pk
>So, looking at the scaling and comparing P4 against Via C3 Nehemiah
>Speed 6809/1591 4.3:1
>Power 85/15 5.7:1
I found slightly different numbers for the C3-Ezra-T 800:
(mind the spaces)
http://www.via.com.tw/en/viac3/VIA C3 Ezra-T datasheet v1.0 .pdf
taking this to its pathological conclusion:
C3 Ezra T-800 C3 Nehemiah 1Ghz P4
heat dissip. W 5.0/8.5pk 11.25av/15pk 85 (peak or avg?)
dhrystones d 1048 1591 6809
d/W 209/123 141/106 80
ratio 2.6 / 1.5 1.8 / 1.3 1
Now I dont know which power number to choose for the C3's - the power
ratings are listed as "average power dissipated while running Winstone 99
on Win98" in the PDF. And there's no numbers there for the E10k-n (the
pdf link was off a June 2002 article from Tom's HW) for avg/peak power.
These numbers dont really mean that much, except in a very general sense.
Specific benchmarks and direct power usage readings would be much more
- If you add a HD to the setup per CPU, you blow your total W/node figure
(not to mention your price curve).
- I dont know what dhrystones are an accurate measure of what everyone is
doing with clusters these days
- I dont know if what people do with clusters excercises average or peak
power consumption for any CPU (or for some and not others).
(I do know that burnMMX and burnK7 running together would blow our
breakers for dual Tbird 1.3Ghz on Tyan 2460s with no HDs on 300W enermax
power supplies and 512Mb ram at 8 boards/15 Amps, where as running G98
or gromacs code did not, so what's running is relevant.)
Furthermore, it is to be noted that the E10K-n does require active cooling,
changing the amount of space required ('volume' for airflow must be included)
- though Im guessing that in a 'blade' type setup or with inline airflow over
big heatsinks, you could avoid fans onboard.
For computation power vs Watts, we should really be looking at the new
low-power celerons, I bet they have some figures competitive to the C3.
>> dhry whet mmi mmf memi memf
>>e800 1048 285 963 1588 194 208
>>e10k 1300 351 1193 1968 233 245
>>e10k-n 1591 366 2255 2285 664 389
>>p4 6809 9327 22170 13896 5050 5041
>>ath 3319 8855 13011 12217 2912 3080
>>I think it's pretty clear that you need to expect much lower
>>performance from even the 'high-end' VIA chips. if your code
>>more resembles dhrystone (mostly integer, cache friendly),
>>then you can mostly expect to scale with clock speed, and the
>>VIA chips might be attractive on a speed/(heat*cost) basis.
>>for general clusters, where memory bandwidth and FP performance
>>and integrated gigabit are big advantages, VIA doesn't compete.
>>data is from the article above and
>James Lux, P.E.
>Spacecraft Telecommunications Section
>Jet Propulsion Laboratory, Mail Stop 161-213
>4800 Oak Grove Drive
>Pasadena CA 91109
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