What am I doing wrong?

[afireinside]

Ok so I tried DIce again today with a brazed container. 1/2" base 2" wide 12" tall tube. Filled half way with small chunks of ice than a bit of 99% isopropyl alcohol and filled to top. Booted to -34C and it eventually went to -27C BIOS. Max clock was 3.1ghz. Temps skyrocketed and load would not hold. I took tube off to see bad contact with IHS. 2 remounts later I'm here with what I THINK is really good contact. Boots -40C now I'm at -25C. Load after a 1M Pi is around -10C.

What am I doing wrong? Does my tube suck? Do I need a wider tube? Some sort of maze pattern in the base? Different fluid? More/less fluid? Better hold down? Does my chip just SUCK? I might just get a chilly1 tube because this is really pissing me off

[eshbach]

i've had the same problem. i think it's the base.

[Malachia]

don't measure temps with mobo's sensor....just get a good temp probe from chilly1, not a container

[afireinside]

I'm getting a DT200 as soon as I find one on ebay. Still, being able to Pi at 3.1 and not even 3d at 3ghz is kind of odd and so is having the BIOS temps shoot up 15-20C between idle and load... If the tube holds load fine and I cant run 3d at 3ghz -79C I quit OCing

[Malachia]

belive in me, you only need a good temp probe

[masterofpuppets]

Mobo's temp readings are taken from the socket, which isn't accurate at all. Plus, most mobo manafacturer's use crappy probes.

[Revv23]

the last time i checked A64's used ondie probes.

anyways, thats not to say they dont suck...

but even if the probe is 20c off, that wouldnt explain the 20c difference between load and idle. like i said on aim, i think its the base, maybe 1/2 is too thick for just a flat plate? if there were some sort of grooves this might not be so bad, a wider tube wouldnt hurt much either.


edit - any pics of the pipe?

[harleybro]

1/2 inch base should be fine. I wouldn't trust the sensors though. Actually haven't seen the temps. except in the bios on mine. When I try while in windows I see like -2xx lol

[afireinside]

Sensor or not, I can't even get 50mhz higher 3d over ice water yet I can get 150 over ice water for Pi. Something is wrong.

[scragley]

Did you fill up the whole tube with isopropyl? that could be your problem. I think i read that you only need around 2 inches of propyl alcohol with the tube 1/4 full of dry ice.

[Revv23]

then your pipe is to thin to handle the heat load, not enough contact area for the DI, so you either need more surface area on base of the block, or a wider pipe, its simple as that, not enough cold liquid in contact with the base to keep the cpu cold.

[harleybro]

Did you fill up the whole tube with isopropyl? that could be your problem. I think i read that you only need around 2 inches of propyl alcohol with the tube 1/4 full of dry ice.

I only coat the bottom maybe an inch or less and I use acetone instead of alcohol. After that I fill the tube up about 1/4 of the way with DI.

[afireinside]

I only used a tiny bit of alcohol...

[harleybro]

I have also used just enough to coat the bottom and it worked well. Maybe a poor piece of copper you are using for the plate? In otherwords air bubbles or imperfections? What are you using to check temps. while in windows?

[afireinside]

Nothing in windows.... Just BIOS.

[Revv23]

Nothing in windows.... Just BIOS.

then where are your load temps coming from?

[afireinside]

Its called reboot and add a few C Either way its NOT holding load.