Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cs.utexas.edu!tut.cis.ohio-state.edu!unmvax!ariel.unm.edu!hydra.unm.edu!jcmiller
From: jcmiller@hydra.unm.edu (Jeff Miller)
Newsgroups: comp.sys.sgi
Subject: Hardware question on 4D/20
Message-ID: <1990Jul3.063306.28718@ariel.unm.edu>
Date: 3 Jul 90 06:33:06 GMT
Sender: usenet@ariel.unm.edu (USENET News System)
Distribution: usa
Organization: University of New Mexico, Albuquerque
Lines: 22


	Hello fellow SGI users!!

	I have a couple of hardware questions for all of you GURU's out there:

(1) What is involved in upgrading a 4D/20 to a 4D/25? I am willing to perform
the surgery myself. I believe that it involves replacing the R3000 and R3010
CPU and FPU with faster components and, of course, faster RAM. In addition, 
there seems to be room to install 64Kb of cache RAM in place of the existing
8Kb cache. Is there any special hardware swith to tell the CPU that it has
more cache? 
( Yes, I know the proceding proposal definitely voids my warranty-- if I
still had one :-)

(2) What are the power requirements for a fully loaded 4D/20 w/o hard drive 
or tape? 

(3) How much airflow is a "safe" minimum for the SGI? (in cu ft / min) ?
Thanx in advance!!

jcmiller@hydra.unm.edu
"There are two types of people in the world--fast and hungry"