• Welcome to Overclockers Forums! Join us to reply in threads, receive reduced ads, and to customize your site experience!

Is there such a thing as TOO COLD?!?

Overclockers is supported by our readers. When you click a link to make a purchase, we may earn a commission. Learn More.

engjohn

Senior Member
Joined
Dec 18, 2000
Location
SoCal
Well I have the pelt on the ol p///700 @ 1G and with seti running it is sitting at -23c according to MBM5. When MBM started, just before seti, the CPU was at -31c.

So the question is, Is there such a thing as too cold???
oh yea, ist a 80w pelt on a 15v @ 10a PS, and the pelt is water cooled.
 
W

William

Guest
i am not completely sure but here is my thoughts. Your cpu cannot be too cold. The only problem I forsee is if your temps vary a lot that you could stress out the cpu from the expansion and contraction. Other than that no.

And yes there is too cold, that would be absolute zero, but I am sure you are not going to the get that far....
 

Snuffleuppigus

Senior Member
Joined
Dec 16, 2000
engjohn (Apr 03, 2001 07:35 p.m.):
Well I have the pelt on the ol p///700 @ 1G and with seti running it is sitting at -23c according to MBM5. When MBM started, just before seti, the CPU was at -31c.

So the question is, Is there such a thing as too cold???
oh yea, ist a 80w pelt on a 15v @ 10a PS, and the pelt is water cooled.

Well.... my PIII 650 @ 1G will run about -20c under load and -50c idle (not sure below -50 as the PIII doesn't seem to read below that). as for temp stress effecting it, i have constant fluctuations of 15c or so that doesn't seem to be the issue.... only issue i have is that i have to re-tighten the 4 screws that mount my waterblock to my processor about once a month.
 
OP
engjohn

engjohn

Senior Member
Joined
Dec 18, 2000
Location
SoCal
I have it insulated pretty good. I have dielectric grease filling the socket, a square of neoprene in the center of the socket, and I have applied two layers of PlastiDip to the slocket itself. Oh yea, I have hacked up a mouse pad and made a neoprene sandwitch around the slocket. Everything has dielectric grease on it to keep the air out. So far so good...
 

stool

Senior Member
Joined
Dec 20, 2000
Location
Albany, NY
I don't think cold is ever going to be a problem for the CPU.. It will only be when you get into real supercooling that you'll have problems with peripherals. Check out some of the supercooling ****(liquid nitrogen, etc) and you'll find cards, boards, and drives taht don't really like the cold
 

Thelemac

Administratively Deficient
Joined
Mar 15, 2001
Actually at around 50 below or so the silicon starts contracting too much and starts pulling apart. I would assume that to be bad.
 

dimmreaper

Senior Member
Joined
Dec 16, 2000
Location
home
Thelemac (Apr 03, 2001 11:47 p.m.):
Actually at around 50 below or so the silicon starts contracting too much and starts pulling apart. I would assume that to be bad.
BINGO . . . . Thelemac has the ticket, cold can kill as easily as heat. A CPU at -50C or colder may seem fine for days before it dies, but it ain't fine.
 

The Faceless Rebel

Registered
Joined
Mar 3, 2001
Generally, if you're going to Peltier something I hear the recommendation is to get rid of stuff like CPUIdle/Rain/Waterfall/etc. It's even more beneficial to run something like [email protected]/Prime95/[email protected]/etc. that keeps your CPU going at 100% all the time. Hey, it can't hurt, and by running these programs you're helping a good cause of some kind or another. :)
 
OP
engjohn

engjohn

Senior Member
Joined
Dec 18, 2000
Location
SoCal
I run [email protected] and my cpu stays st -24c. I have not let it just sit idle, as I am too scared to see how cold it will get. I have seen -35c. But that seems kinda cold.
Funny thing is, it will run -25c with seti running at 1107Mhz, but at
1130 it idles at -5??

Not so stable at 1120+Mhz yet...
 

Fink

Member
Joined
Dec 18, 2000
Jeff Evans (Apr 04, 2001 07:23 p.m.):
Thelemac (Apr 03, 2001 11:47 p.m.):
Actually at around 50 below or so the silicon starts contracting too much and starts pulling apart. I would assume that to be bad.
BINGO . . . . Thelemac has the ticket, cold can kill as easily as heat. A CPU at -50C or colder may seem fine for days before it dies, but it ain't fine.

I cycled a 50 x 90 mm PCB (a high sensitivity IR detector) down to -78C about 60-70 times over the course of a year then it failed. The traces delaminated (came off the board) and there were some stress fractures the the 4-layer PCB itself. There are techniques for warming and cooling detectors slowly down to -78C or liquid N2 temps (-178C) to prevent destruction of immersed PCB boards... again their biggest problem is stress fractures caused by too rapid cooling or heating.