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- From: sheldon@iastate.edu (Steve Sheldon)
- Subject: Re: Leaving machine on 24hrs??
- Message-ID: <sheldon.724437822@pv1417.vincent.iastate.edu>
- Sender: news@news.iastate.edu (USENET News System)
- Organization: Iowa State University, Ames IA
- References: <2B2D2A03.23733@news.service.uci.edu>
- Distribution: usa
- Date: Tue, 15 Dec 1992 16:43:42 GMT
- Lines: 78
-
- In <2B2D2A03.23733@news.service.uci.edu> eapu168@orion.oac.uci.edu (Lee Furnival) writes:
-
- >I am in the process of advising someone in the purchase of a new pc and
- >have a question regarding extending the life of the chips. We will be
- >getting a clone 486DX-33. There are 2 cooling fans in a mid-tower case
- >and I am going to install a fan/heatsink on the CPU. Question:
-
- From what I've found, 2 cooling fans in a 486DX33 is more than enough.
- Actually with a case with proper cooling, like a tower case usually has,
- one fan is enough for a 33 Mhz chip. The 50 Mhz might need a bit more
- cooling, it all depends, or if you're filling the case with cards,
- drives, and other heat producing stuff.
-
- I asked a knowledgeable EE(my father :) about judging whether chips are
- too hot. Basically he said, while you can take all kinds of measurements with
- temperature probes, etc, the easiest way to do field testing is your finger.
- If you can't hold your finger against the chip for longer than 10 seconds
- or so, the chip is too hot, and needs a heatsink. Simple, and unscientific,
- but probably fairly useful for judging long term reliability.
-
- Also, turning off the turbo switch will run the chip cooler. Obviously
- you'd do this if you left the computer sitting overnight not in use, or
- something like that.
-
- Anyway...
-
- > Should the system be left on 24 hours a day?
-
- >I know many UNIX freaks who leave their Suns and NeXTs and Macs on 24 hours
- >a day and they say that it is better than turning the system on and off every
- >day. Is this true? Also, we will be getting a 17" digital monitor. Is it
- >acceptable for that to be left on as well assuming we screen-save? While the
- >logic of leaving the systems turned on has been explained to me from the
- >standpoint of less stress on the chips, what about the hard drive? Will I
- >be testing the bounds of "MTBF" ratings by leaving everything on?
-
- Tradeoffs. For Unix systems I think it's mainly a matter of convienience,
- as shutting down and starting up takes time and is sometimes a pain.
-
- As far as MTBF... You're more likely to have the machine hit by a disaster.
- Whether that be lightning, or somebody tripping over the cord, and having the
- moving harddrive drop 3 feet to the ground. (not good, and testing the
- true bounds of reliability), or other stupid tricks.
-
- One other consideration, especially with monitors with high voltage. As
- these things age, things go wrong. Dust get's in them, etc.
-
- In our lab here, I've had two monitors literally blow up in smoke. They
- started crackling and popping, and smoke came out the top. I unplugged
- them immediately, but there is a potential for a fire to start.
-
- I've heard several stories of audio amplifiers left on overnight shorting
- out and starting speakers on fire.
-
- In conclusion:
-
- Turn the monitor off when not in use for more than a couple hours. A
- screen saver isn't going to help it much, because screen burn-in is the
- least of your problems.
-
- The computer. I'd go either way. Leaving it on is really just a matter
- of convienience. Turning it off everyday isn't going to shorten it's
- lifespan. Turning it on and off repeatedly every five minutes, might,
- but not once a day.
-
-
- >Any info appreciated, and e-mailed info appreciated even more...
-
- >Thanks,
- >Lee Furnival
- >eapu168@orion.oac.uci.edu
- >eel@silverblue.fac.cs.cmu.edu
-
- --
- sheldon@iastate.edu Steve Sheldon
- This space left intentionally ICSS Resource Facility
- blank. Iowa State University
-
-