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GPU loop- terrible 6990 temps - Page 3

post #21 of 29
Hold on...so you say the water coming out of the block is hot, but your radiator is cool? And the water going to your cards are cool as well?

Are you using the correct inlet/ourlet?
post #22 of 29
Quote:
Originally Posted by earthwormjim View Post
That's a good point, I didn't even think about orientation of the radiator.
Aye the swiftech pump/res/rad combos have a lot of things going on.

I think most of the danger is in the initial stage where there may not be adequate water to fully submerse the pump, as well as getting all the air bubbles out, if used in the wrong position.
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post #23 of 29
Quote:
Originally Posted by kiwiasian View Post
Hold on...so you say the water coming out of the block is hot, but your radiator is cool? And the water going to your cards are cool as well?

Are you using the correct inlet/ourlet?
It shouldn't matter as long as they are going in the same direction. I don't remember my 6990 water block having an In/Out.
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post #24 of 29
Thread Starter 
SOLVED!

So I got home and took the fill cap off and noticed the water level was much lower than it was last night. This got me thinking that there was air trapped somewhere that was keeping water from filling the entire loop.

So then I got to thinking that the instruction manual states that although the rev. 2 allows you to mount the X20 in horizontal configuration, Swiftech still recommends tilting the reservoir during filling...Which I did. So anyway, I thought perhaps I could give it a bit more motivation by completely turning the case on its side so the rad is vertical.

I did this, turned the machine on, and low and behold I heard a huge sucking sound and water rushing around the GPU area. After leaving it for a few minutes and setting it right side up it continued to work fine.

Temps are a wonderful 28-32*C at idle and 38-40*C full load across all three GPU's now.

Thanks for all the help guys!
    
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post #25 of 29
Thread Starter 
Quick question- I bought a 655 pump yesterday assuming it would be a problem with the MCP-35x. Would there be any benefit at all to adding the 655 to the loop and using both pumps?
    
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post #26 of 29
Adding another pump wont do anything for your temps if they look that good already, if anything, it may dump added heat into the loop.
    
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post #27 of 29
Hey bro I have dual 6990's and my CPU on one loop I hit about 36C on idle.


Id make sure you blocks are on good and all contact points are good.

A good rule of thumb is 120MM per component.

You have a 6990 = 2
6070 = 1
CPU = 1

You should have around 480mm of Rad to cool that beast.

Example I have My 4 GPU's + 1 CPU.

I am run a 360 RAD x 2...Which is a little over what i needed. I would of been fine with a 360 + 240.

I see you removed the 6970...is your CPU OC'd?
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post #28 of 29
Thread Starter 
Quote:
Originally Posted by ttoadd.nz View Post
Adding another pump wont do anything for your temps if they look that good already, if anything, it may dump added heat into the loop.
Thanks, I'll just return the pump.

Quote:
Originally Posted by FrostyGPU View Post
Hey bro I have dual 6990's and my CPU on one loop I hit about 36C on idle.


Id make sure you blocks are on good and all contact points are good.

A good rule of thumb is 120MM per component.

You have a 6990 = 2
6070 = 1
CPU = 1

You should have around 480mm of Rad to cool that beast.

Example I have My 4 GPU's + 1 CPU.

I am run a 360 RAD x 2...Which is a little over what i needed. I would of been fine with a 360 + 240.

I see you removed the 6970...is your CPU OC'd?
Thanks, I actually was able to resolve the issue, I had to put my whole machine on its side so the Rad was completely vertical. I am only using the loop for my GPU's, my CPU is cooled by an H100. Temps on the 6990 and 6970 are a solid 40*C ish under full load now.

Thanks!
    
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RAMHard DriveHard DriveOptical Drive
Corsair Vengeance Kingston Hyper X SSD Hitachi Ultrastar Enterprise HDD Asus BW-12B1ST 
CoolingCoolingOSMonitor
Corsair H100 Swiftech MCR-Drive Rev2 Windows 7 64bit Dell U3011 
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post #29 of 29
Quote:
Originally Posted by KidKB View Post
SOLVED!

So I got home and took the fill cap off and noticed the water level was much lower than it was last night. This got me thinking that there was air trapped somewhere that was keeping water from filling the entire loop.

So then I got to thinking that the instruction manual states that although the rev. 2 allows you to mount the X20 in horizontal configuration, Swiftech still recommends tilting the reservoir during filling...Which I did. So anyway, I thought perhaps I could give it a bit more motivation by completely turning the case on its side so the rad is vertical.

I did this, turned the machine on, and low and behold I heard a huge sucking sound and water rushing around the GPU area. After leaving it for a few minutes and setting it right side up it continued to work fine.

Temps are a wonderful 28-32*C at idle and 38-40*C full load across all three GPU's now.

Thanks for all the help guys!
Guess I get the win on this one.
Main Rig
(13 items)
 
  
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 
CaseMouse
Corsair 600T Logitech G500 
  hide details  
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Main Rig
(13 items)
 
  
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 
CaseMouse
Corsair 600T Logitech G500 
  hide details  
Reply
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