I have now moved the GPUs into colder water as well. I wanted to chill them slightly, so I used a 10' piece of garden hose from the pump to the 1st GPU and made that garden hose go through the chiller through the 2 holes already in the lid.

Now they are idling ~10-15 C cooler( low 30s) and the hoses are no longer hot. :thumbsup: I'm very pleased.....I think I may use a longer piece of garden hose and cool them a little more. I decided submerging the radiator would get them too cold and I'd have condensation.

very impressive... you are following right along the addictive schedule.....

by that I mean your daily rig will end up on either ambient air or water, and you will have a single stage by your benching rig, as well as a pot or two.... you can deny it, but it's coming. .....oh and it's reallllllyy fun. all the cool kids are doing it. :keeporder:

Seriously though, this has been one of the most epically detailed chiller threads I have ever seen come together, if not THE most detailed. You just did more than anyone with any amount of ln2 could do... you inspire to create.

my condolences on your impending addiction to the frost.... :cool3:

It has been a long journey from the ceiling to the floor...:D

Ehh definitely! More cold is coming I'm sure!

Yeah you could call it this way! :thumbsup: :D

Awesome, glad OCA was privileged to be on this journey with you into the cold :D

It's been a great, fun, and trying experience getting this thing working well. I'm glad I brought the build log here. :thumbsup:

It's benchtop style from here on out I'd say. I like my computer much better with it out in the open.

Adding 4' of hose to the gpu loop, coiled up in the chiller. Pics & results later. The chiller didn't get very cold last night for some reason...or so it seems looking @ the thermometer.......only ~ -30c:thumbdown:grrrrrrrrrrrr...it was -22 when I went to bed @ 1AM. WTF?

My chiller lost a bit of capacity after a while as well. It could be due to the imense pressure build up in the system taking a toll on the compressor. Turning the unit on while still very cold in the bath can cause this too, but it seems gradual.

Make the most of the deep temps you get now, it may not reach these optimal temps consistently.

Bummer....my chiller is already on it's way out? :thumbdown:

Anyways the 2nd loop I added going through the chiller dropped the gpu temps from the low 30s to the low 20s idle...... which is perfect for them. :thumbsup: I hope it lasts awhile, geez I just got it working.

If it quits working good before I get my new thermometer I'm going to be highly irritated.

It'll be gradual so at least you'll have some fun with it :D

And if it totally fails, I've got the prescription for yah which you'll find is by far more exciting :D

Till then...........Froster the FEVER!
Attachment 3139
Attachment 3140

I have a theory......when the consistency of the coolant turns to slush and the evaporator is all covered in thick slush.....it no longer works very well to cool the coolant.

OR.....the coolant, once it turns to slush cools much slower. Like if you have a freezer full of water bottles....when they freeze up today they will not be as cold as the will tomorrow if left in the freezer. Ice cools slowly.

OR.....my chiller won't take anything below -31 C anymore, when last week it took some coolant down to -45 C. All I have left to thin it with is that jet fuel I got the other day mixed with antifreeze. :thumbdown: I'll try a gallon or so and see if it helps tonights chilling.

EDIT: here is a picture of the slightly chilled gpu loop.