1U P4 Systems

[alvin at Mail.Linux-Consulting.com]

hi josip..
you are right in your concerns...

teh itty-bitty 40mm fans are barely enough to keep the 
1U chassis cool....even for a P3....amd and p4 requires
lots more cooling capacity...

amd athlon/duran require 250W power supply ??...
Intel P3 system can get away with 150W power supply...

larger cases ( deeper ) does NOT provide any cooling
improvements... you have to move the air around... and
the problem is the atx connectors in the back prevents
air flow.... front to back...or side to side is okay too

all of this is in 1U cases...

we have lateral/squirl cage fans that we are considering
for our next generation P4 based 1U chassis ... 

thanx
alvin
http://www.Linux-1U.net



On Mon, 21 May 2001, Josip Loncaric wrote:

> Steve Gaudet wrote:
> > 
> > Based on the current P4 die won't see the P4 in anything smaller than a 2u.
> 
> Except for the P4/1.4 1U RackSaver link posted by Tim...  However,
> cooling a 1U case concerns me.  The RackSaver RS-1100 claims to have 6
> small case fans (> 40 cfm total), and a 250W ATX12V power supply.  I
> understand the need to be space efficient, but I'd feel more confident
> about cooling with larger cases...
> 
> Sincerely,
> Josip
> 
> P.S.  RackSaver uses P4/1.4 which can dissipate 51.8W.  By contrast, the
> P4/1.7 can dissipate 64.0W in normal use, i.e. more than a fairly large
> soldering iron...  BTW, this 64.0W is Intel's "thermal design point" for
> the P4/1.7 processor.  Their "thermal design point" is based on 75% of
> the maximum power dissipation (which could reach 85.3W, lead to internal
> hot spots, etc.).  Intel claims that most popular applications
> (including SPEC benchmarks) fall below this 75%.  However, ATLAS and
> some other cache optimized codes can seriously stress this
> assumption...  Excellent cooling is essential when doing very intense
> computations.
> 
> -- 
> Dr. Josip Loncaric, Research Fellow               mailto:josip at icase.edu
> ICASE, Mail Stop 132C           PGP key at http://www.icase.edu./~josip/
> NASA Langley Research Center             mailto:j.loncaric at larc.nasa.gov
> Hampton, VA 23681-2199, USA    Tel. +1 757 864-2192  Fax +1 757 864-6134
> 
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