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6970 freezing after 84c on water?

post #1 of 18
Thread Starter 
So, I finally resolved the whole issue of getting the wrong block, see http://www.overclock.net/water-cooli...my-6970-a.html.

I installed the V2 version of the block and leak tested if for a few hours and decided to go ahead boot up and run some benched to see the temps. Now the issue is that at idle the temps have not gone over 32c GREAT compared to the 52 on air! But once i get the usage at 80%+ the temp goes to 84 then freezes! I cant even run any bench or play bc2. When I play Dead Space 2 the usage never goes above 50% and temps do not go above 50c as well.

I am using AS5 so Im not sure if i need to make sure the gpu is covered correctly or let it cure for a while. I really dont want to pull it all out and do it again if I don't have to. Can anyone make sense of this for me? idle - 50% usage is great anything above is not so great. Also, the cpu in the loop hasn't changed much since adding the gpu block. 34c idle/57c load (well as loaded as I can get it before the crash).

Heres a pic of it installed:


Any help/suggestions are appreciated!


As advised here is the rest of the loop:

Swiftech MCR320 Drive
Swiftech Apogee XT Extreme (CPU)
Bitspower Water Tank Z Ultra (Res)
3 Triebwerk TK-122 NB Fan
Bitspower G1/4 to 7/16 Barbs Matte Black
Tygon R3400 3/8in. ID 1/2in. OD Laboratory tubing

Edited by OverSightX - 4/15/11 at 1:36pm
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post #2 of 18
I can't see the picture right now, but can basically give you a few points to consider.

1. The block may not be tightened down, or seated properly. Follow EK's directions closely...they work...and it's especially true if you are supposed to use specific thickness frag tape like the FC6970 V1 (what I have) uses.
2. You have air trapped in the block and need to bleed it out (move the system around with the pump running).
3. You don't have enough radiator surface area, or enough airflow over the radiator to cope with the heat output.
4. Your pump does not pump enough water to be effective with the card in use.

That's all I can currently think of. Please, post the rest of your water rig, and how the loop is set up. Include the pump, tubing size, blocks, radiator(s), fan(s) and any other relevant info. That should increase the amount of help you receive.

EDIT: I'd also like to point out that my card, running at the OC limits in CCC, with +20% power profile will peak for a split second at 41C in Furmark (1920x1080, everything up full). The rest of the time it's between 39-40C, and idles at 36. This was in a 27-28C room, by the way, with my fans on silent. If fed enough water, and with enough radiator surface area, this block can perform very well.
Edited by UnexplodedCow - 4/15/11 at 1:35pm
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post #3 of 18
There is definitely something wrong with your setup. 84C is way too high on water. You sure you did installed the block right on? check for visual gap...? did you peel off the 2 side plastic protected films on the thermal pads?
post #4 of 18
Thread Starter 
AS advised I have put in the rest of the loop hardware. Thanks!

Quote:
Originally Posted by UnexplodedCow View Post
I can't see the picture right now, but can basically give you a few points to consider.

1. The block may not be tightened down, or seated properly. Follow EK's directions closely...they work...and it's especially true if you are supposed to use specific thickness frag tape like the FC6970 V1 (what I have) uses.
2. You have air trapped in the block and need to bleed it out (move the system around with the pump running).
3. You don't have enough radiator surface area, or enough airflow over the radiator to cope with the heat output.
4. Your pump does not pump enough water to be effective with the card in use.

That's all I can currently think of. Please, post the rest of your water rig, and how the loop is set up. Include the pump, tubing size, blocks, radiator(s), fan(s) and any other relevant info. That should increase the amount of help you receive.

EDIT: I'd also like to point out that my card, running at the OC limits in CCC, with +20% power profile will peak for a split second at 41C in Furmark (1920x1080, everything up full). The rest of the time it's between 39-40C, and idles at 36. This was in a 27-28C room, by the way, with my fans on silent. If fed enough water, and with enough radiator surface area, this block can perform very well.
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post #5 of 18
Thread Starter 
Quote:
Originally Posted by nden View Post
There is definitely something wrong with your setup. 84C is way too high on water. You sure you did installed the block right on? check for visual gap...? did you peel off the 2 side plastic protected films on the thermal pads?
It looks to me as it all fit just fine after getting this block on. When i look at its side I do see it making contact. The plastic from the thermal pads have been peeled off. I made sure of that. On a note though: I did use the pads of the the rev 1 block. Think it matters? I didn't see a difference in size between the 2.

Ill have to take a better look and a better pic once I get home tonight.
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post #6 of 18
Maybe a difference in thickness. I doubt it slightly, but it may have changed.

Also, the radiator listed...is that the one with the integrated 355 pump? If so, I'd say you might be a little low on pumping power. The radiator should be able to handle the amount of power it has to dissipate, but the video card is getting hot water after the CPU. Maybe get a small 1x120 radiator to trim some heat off between the CPU and GPU? It worked for me pretty well.
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post #7 of 18
Try reinstalling the block maybe, the issue must be there. Make sure it makes contact properly.
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post #8 of 18
take the block off and snap a photo of the TIM spread....
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post #9 of 18
What temps did you get in Air. Also can you feel the RAD getting hot? How fast are the fans and how is the flow.
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post #10 of 18
Quote:
Originally Posted by mikepahl318 View Post
take the block off and snap a photo of the TIM spread....
This. Do a pea sized application and use something other than AS5, maybe some sin etsu, tf 400, something not capacitive also. Something I also do is use a bright flashlight and shine is under the card as I try to look thru the card, checking for gaps.
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