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GPU loop- terrible 6990 temps - Page 2

post #11 of 29
Quote:
Originally Posted by KidKB;15162869 
Earthwormjim- I currently don't have the 4-pin pwm plugged in as my H100 is using it for the cpu block. From what I've read it means the 35x would be running at 100% all the time though?

I thought the 35x would be enough for such a simple loop, but perhaps the length of the tubing is killing flow? I would say it's a good 2ft in length from the pump to the video card(s).

It's not the length of the tubing, and 2 FT is relatively short. The kinds of pressures these pump generate, they could push tens of feet of water vertically through tubing.

It's a closed loop, so elevation changes don't matter, water having to be pumped up, is balanced by water falling down.

Did you ever have your 6970 running with the 6990? How were its temperatures?
Edited by earthwormjim - 10/3/11 at 11:51am
post #12 of 29
Quote:
Originally Posted by KidKB;15162869 
Earthwormjim- I currently don't have the 4-pin pwm plugged in as my H100 is using it for the cpu block. From what I've read it means the 35x would be running at 100% all the time though?

I thought the 35x would be enough for such a simple loop, but perhaps the length of the tubing is killing flow? I would say it's a good 2ft in length from the pump to the video card(s).

If you have your pump plugged into the motherboard it is possible that the RPMs are being adjusted. You can go into your bios settings and disable the fan controls which set everything to 100%.

I was using 2x MCP350s on a 6990 + 6950 + motherboard + cpu loop. My 6990 temp was idle at 40 and highs at 50-60.

How about your rad? Is it hot? Can you feel the fans pushing hot air out?
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post #13 of 29
Thread Starter 
Quote:
Originally Posted by earthwormjim;15163045 
It's not the length of the tubing, and 2 FT is relatively short. The kinds of pressures these pump generate, they could push tens of feet of water vertically through tubing.

It's a closed loop, so elevation changes don't matter, water having to be pumped up, is balanced by water falling down.

Did you ever have your 6970 running with the 6990? How were its temperatures?

Thanks for the clarification. I did have the 6970 in the loop but like a fool I didn't check the temps before I took it out. I do know that it was much much cooler both on the block and gpu side based on touch. I will verify actual temps tonight when I get home.
Quote:
Originally Posted by Intangible;15163105 
If you have your pump plugged into the motherboard it is possible that the RPMs are being adjusted. You can go into your bios settings and disable the fan controls which set everything to 100%.

I was using 2x MCP350s on a 6990 + 6950 + motherboard + cpu loop. My 6990 temp was idle at 40 and highs at 50-60.

How about your rad? Is it hot? Can you feel the fans pushing hot air out?

The pump currently isn't plugged in with the 4-pin pwm, only molex for power.

The rad is not hot at all, the air is pretty cool from the fans (3 cougar vhp's pushing air out).

I am pretty curious about pump flow....As when I first was diagnosing the problem I was able to completely remove one of the caps on the 6990 block without water spilling out. It slowly (about 20 seconds) filled up to where it almost filled but I plugged it back up.

Subsequently, the next time I tried, I wasn't able to completely remove the cap without water coming out, but pretty close.
Edited by KidKB - 10/3/11 at 12:03pm
    
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post #14 of 29
You may have defective blocks.
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post #15 of 29
Quote:
Originally Posted by KidKB;15163179 
Thanks for the clarification. I did have the 6970 in the loop but like a fool I didn't check the temps before I took it out. I do know that it was much much cooler both on the block and gpu side based on touch. I will verify actual temps tonight when I get home.

There's no place you could stick a thermometer into your water? No T-line or fill port? Water temps can greatly help with troubleshooting.

Your idle temps, do you basically have those same temperatures immediately after your computer has booted up, or your GPU slowly reaches them over a period of time. Trying to figure out if you're just exceeding the heat dissipating capabilities of your radiator. If it takes awhile to reach those temperatures, you're exceeding the capabilities of your radiator. The water is just taking time to warm up.

If you reach those temperatures almost right away either your mount is bad, your GPU block is clogged or corroding, or there's something wrong with your pump.
post #16 of 29
Thread Starter 
I will stick a thermometer in the fill port on the radiator when I get home, thanks for the suggestion.

It's hard to say on the idle temps, they definitely creep up (usually are at around 30-40*C at startup), but I've never just let it sit for a period of time and idle to see how long it would take to reach those temps. Typically I will start a game or benchmark tool and the temps will skyrocket within less than a minute to around 80-90*C and still go higher before I kill the program. It's after that, that eventually the temps lower to a stable 50-60*C range.

The Rad is basically a Swiftech MCR320 except it has the reservoir and pump built into it. Does the 6990 and 6970 warrant enough heat to exceed the radiators cooling ability?
    
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post #17 of 29
Quote:
Originally Posted by KidKB;15163470 
I will stick a thermometer in the fill port on the radiator when I get home, thanks for the suggestion.

It's hard to say on the idle temps, they definitely creep up (usually are at around 30-40*C at startup), but I've never just let it sit for a period of time and idle to see how long it would take to reach those temps. Typically I will start a game or benchmark tool and the temps will skyrocket within less than a minute to around 80-90*C and still go higher before I kill the program. It's after that, that eventually the temps lower to a stable 50-60*C range.

The Rad is basically a Swiftech MCR320 except it has the reservoir and pump built into it. Does the 6990 and 6970 warrant enough heat to exceed the radiators cooling ability?

No I'd say your radiator is fine, water temps will verify this, but I'm pretty sure it's good.

I would investigate your mount again, and check to ensure the inside of the GPU block looks fine. Maybe some screenshots of how the thermal paste looks when you pull the block.
post #18 of 29
Thread Starter 
Thanks jim, I appreciate the help (as with everyone else). I'll report back with more thorough information.

Rep for you.
    
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post #19 of 29
Quote:
Originally Posted by kill;15163241 
You may have defective blocks.

I seriously doubt that. The full body GPU blocks are pretty standard once they are designed. And if there was any defects it would probably be leaking.

Kid:

I'd try testing your pump. Put an inlet hose to a bucket of water and then the outlet hose to another bucket. Preferable if you have a tub shower to see the type of head. Then check to see how much "head" its rated at. If it's no where near that then you have a problem with the pump.

This goes w/o saying but did you get all the air bubbles out? Also is the radiator installed correctly? There is only a few positions that type of rad supports. You can find it on the swiftech website.
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Main Rig
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CPUMotherboardGraphicsRAM
Phenom II X6 1090T @ 4.1 GHz Asus Crosshair IV Formula Radeon HD 6990 / 6950 Trifire 16 GB G.Skill 1600 (4GB x 4) 
Hard DriveOSMonitorPower
2x WD1600 7200 RPM Sata 3.0 | Raid 0 Windows 7 Ultimate 64 Samsung 24" Thermaltake TR2 1000W 
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post #20 of 29
Quote:
Originally Posted by Intangible;15163996 
I seriously doubt that. The full body GPU blocks are pretty standard once they are designed. And if there was any defects it would probably be leaking.

Kid:

I'd try testing your pump. Put an inlet hose to a bucket of water and then the outlet hose to another bucket. Preferable if you have a tub shower to see the type of head. Then check to see how much "head" its rated at. If it's no where near that then you have a problem with the pump.

This goes w/o saying but did you get all the air bubbles out? Also is the radiator installed correctly? There is only a few positions that type of rad supports. You can find it on the swiftech website.

That's a good point, I didn't even think about orientation of the radiator.

rev2-orientationsx354x929.jpg
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