I'm impressed with this $25 submersible pond/fountain pump from Harbor Freight. :thumbsup:

Great thread ny_driver! Made for a very interesting and informative read. I myself am experimenting with a "chiller" of sorts. Sub ambient for now ;) Running into a lot of issues at -25 and below. I'll start my own thread here soon.....

OCM :thumbsup:

Thank you!

I'm feeling like quite the expert now. I documented most of the trials and tribulations.

The keys are the coolant mix and the ability to pump that coolant. 70% antifreeze seems to be the best mix so far, but it is thicker than water. So when designing your loop keep in mind the added viscosity of the coolant. :cool3:

Today I tried 75% anti-freeze/25% DI Water and got slush at -25C. Looks like I need a better pump and coolant mix.

Another one tippy toes into the sub-zero realm. :good:

You must have bought really cheap RV antifreeze or something, because a mix of 70% automotive antifreeze won't ever slush up at all even at -45 C (the coldest I have tested)....it's good to ~-60C according to the manufacturer at 70%.

Maybe you are way below -25 actually...what are you using to determine the temperature? And what are you using to cool the coolant? How many BTUs?

We will get this slush problem solved.

No need for distilled water when using antifreeze...you are not going to get any algae or anything.

Hmmmmmm:blink: slush problem huh? I only had that when I used RV-water system antifreeze, or with too much water.

Ohh and do not try the -50 ice breaker washer fluid either. The evaporator gets all gel covered at ~ -30 C.

Are you positive you have a slush problem or is the problem that the coolant isn't pumping (viscosity/restriction problem) and you are assuming slush? Just want to be sure. I modded my block so there was no unnecessary restriction.

This is the pump that did all my chiller work, viscous and all:
http://www.xtremesystems.org/forums/...d.php?t=170509

Yeah, tell me about it, lol.
Ok, here is the thread: http://www.overclockaholics.com/foru...4866#post54866

OK finally with some concrete numbers........:thumbsup:

I started today(4.5GHz of course) ~8 AM with the chiller @ -40 C and the block @ ~ -25 C, now @ 1:45 PM the chiller is @ -30 C and the block @ -17 C.

Good thing electric is cheap where I live. I've had the chiller running for the better part of a couple weeks now. :D

Nice numbers! I still have a ways to go........

OCM :thumbsup:

Thanks I'm pretty pleased. From the looks of what you've done so far I'd say you'll definitely get there. Your plan will evolve and get better. :thumbsup:

Howdy everyone. Been away at work with no computer, but not this week.

New record here for the chiller mates! 4.76627GHz...:blink: ...I'm surprised it hasn't crashed yet.:cool3:

Nice. How are your temps holding up?

The face of the block runs ~-35 up to -28 Ceisius, so I'd say the cpu stays sub-zero. Actually saw -11C in the BIOS today after a good 30 minute pre-freezing. I've been told the software is not accurate when that cold. PC probe said -9 C, but not for long.

I think I want to get a better pump, higher flow.

EDIT: and it crashed....btw

Congrats on the new PWR (personal world record) :D

Thanks, I'm back to work now too guys so it won't be long before I am forced to go grab a 30 liter to play with....hahhhh, maybe this weekend.

You'll never look back..................:morpheus:

Yep :ohcrap:

Still playing with the chiller, got it working better than ever and have a new pump on the way also.

It seems that the sensor responsible for the cpu readings has gone bonkers today. It reads 65 C atm, but the face of the block reads -37 C. It started doing this earlier @ 4.5GHz/1.5v, but now I'm at 4GHz/1.3v and it's reading even higher than earlier.......ohhh shit I looked up and we are back to -1(in real time while typing this post even)....bonkers like I said.

Anyone ever had that happen?

Is the mount good?
I've heard of intel sensors going bonkers but man that would suck if the mount was bad and something was between the ihs and the block. A partially good mount would make idle temps sub-zero but soon as you punch a load on it, shoots up high.

Pretty sure the mount is good. It's been on there for 2 weeks. It's not acting like that...just random, stupid for awhile and now it's fine again.

Must be getting close to Halloween ;)

I think maybe it's the chips way of saying, "hey asshole I thought you were going to get some LN2 for me?"

I plan to buy a 30 liter or 2 to try it out very soon, or maybe just get the big one delivered as a birthday present for myself in a couple weeks.

Maybe this week I'll buy a SATA DVD burner, so I can get Tinyxp installed. I still need to get a few more of the benchmark programs, but I know where to find them.

UPDATE: I've added a more industrial pump, but it's a little too loud for constant use so I'll add a Y-valve and a 2nd return port to the chiller tomorrow and have 2 pumps I can use. :keeporder:

EDIT: this baby shoots the water right into the evaporator.

UPDATE: that pump was junk, I had to return it. It started leaking black stuff from the motor housing after only a couple days of very part time usage. Back to the harbor freight pond/fountain pump. :thumbsup:

ell...I have been using the harbor Freight fountain pump for quite some time now with no problems. Without the gpu loop running through the system the cpu runs ~-20 Celsius @ 4.5GHz/1.51v/C&Q enabled. And with the gpu loop chilled also, the cpu only runs ~5 degrees warmer.

Working pretty well. I wish I had time to get some LN2 to pour in my F1EE.

EDIT: Maybe I'll get a week off over Christmas/new years.......I'm ready for one now and it has nothing to do with playing on the computer. I'm fucking killing myself out here trying to make up for the guy working with me/for me and drivng me to work.

:ohcrap:I left the pump on all week by mistake with ambient antifreeze going through it. It still works, but I think I need to clean out the waterblock today and/or replace thermal paste.

Hey guys I got my 1090T installed last night.

I had to re-pour the Dragon Skin, because the 965 would not come out without removing the 1/4" thick rubber. The outside 2 rows of pins have rubber all over them. But that skin works like a champ. I had antifreeze leaking all over the cpu socket while I was at work this week. I forgot to tighten the hose clamps enough post-maintenance last weekend......but my bench sits at a slight angle for this reason exactly and it just ran right off on the table underneath. Didn't get into the DIMMS at all or anything :thumbsup: I actually came up with the tilted bench idea myself:keeporder:

Dragon Skin is awesome stuff. Here is a picture of last nights pouring...:ohcrap:as you can see my bench is tilted and I forgot to un-tilt it before pouring......lol
currently @

That dragonskin looks like awesome stuff 4 sure. May have to break down and pick some up...

I think it was like $40 and I have poured 3 or 4 already and have enough left for another 2 I'd say. I've wasted some(leftovers) and have been pouring pretty thick, but it's hard to mix up a small enough amount......and the 2 ingredients are of different consistency, so it's tough to get an equal mix. I suggest a short flexible mixing bowl.

I think pouring it thick makes it harder to get off because it gets molded around and under everything, but I feel confident that my cpu socket is all sealed in...even better than the last time. :thumbsup:.............although how does perfectly sealed get any better?:D

What have I been missing here? This is awesome!

4840MHz thanks to overdrive ;) I need a little more vcore to get 4900 I'll bet.

Happy Thanksgiving.:thumbsup:

EDIT:
And yes I have found the submit button

4.87GHz.......trying like hell for 4.9+

I had it but it validated lower. :blink: