home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.arch
- Path: sparky!uunet!mcsun!Germany.EU.net!news.netmbx.de!zrz.tu-berlin.de!math.fu-berlin.de!Sirius.dfn.de!rz.ruhr-uni-bochum.de!jan
- From: jan@pallas.neuroinformatik.ruhr-uni-bochum.de (Jan Vorbrueggen)
- Subject: Re: question on computer systems using Alpha ... (cooling)
- Message-ID: <JAN.92Aug14135936@pallas.neuroinformatik.ruhr-uni-bochum.de>
- In-reply-to: martin@minster.york.ac.uk's message of 13 Aug 92 10:58:50 GMT
- Organization: Inst. f. Neuroinformatik, Ruhr-Universitaet Bochum, FRG
- References: <1992Aug10.202955.4254@talon.ucs.orst.edu>
- <DOCONNOR.92Aug11133018@potato.sedona.intel.com>
- <1992Aug12.121427.10251@dscomsf.desy.de>
- <713703530.11137@minster.york.ac.uk>
- Date: 14 Aug 92 13:59:36
- Lines: 21
-
- Why doesn't anyone (to my knowledge!) use heat pipes, and/or stirling
- engines for cooling big chips like the alpha?
-
- Look at the design of the GC machines from parsytec. They (will) put
- 8 T9000 plus memory and assorted glue onto a Eurocardsize board,
- cloak the noncomponent side with machined aluminum, put two of these
- boards facetoface, and insert heat pipes into the aluminum grooves.
- I've calculated from their numbers for a big machine that they expect
- about 26W per processor (of which a max of 8W is from the T9000). So
- one 16processor sandwich will dissipate 416W.
-
- Actually, cooling shouldn't be much of a problem provided you can
- actually make good enough contact with your silicon to keep the
- equilibrium down. For a 16k processor GC machine, parsytec expects it
- to dissipate about 430kW. Sounds like a lot? Now look at a 400 horse
- power truck motor. 400 hp is roughly equivalent to 300kW, and the motor
- dissipates at least twice that in heat (efficiemcy is around 30%).
- No problem, all you need is a nice 60 km/h air flow into your computer
- room...
-
- Jan Vorbrueggen, jan@neuroinformatik.ruhrunibochum.de
-