thehun (OP)
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January 08, 2014, 05:04:20 PM |
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I have mounted the following rig: ![](https://ip.bitcointalk.org/?u=http%3A%2F%2Fimg571.imageshack.us%2Fimg571%2F2537%2Fzuv3.jpg&t=665&c=X3GNlWoURZLkJg) and for some reason some of the GPUs heat up a lot more than others. I could understand that the one on the edge gets a little hotter, but not a difference of 17° with the coolest card. ![](https://ip.bitcointalk.org/?u=http%3A%2F%2Fimg542.imageshack.us%2Fimg542%2F7810%2Fm367.png&t=665&c=gLdod5SZh6Kcqw) I am running the fan of GPU 3 at 95% already. Any tips on why it could be getting so hot?
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mikeybit
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January 08, 2014, 05:18:25 PM |
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I ran into the same issue with some 280X's. Mine turned out to be defective. The cooling pipes were cool to the touch while the GPU was getting to 90*+. The heat transfer plate and/or thermal paste weren't doing the job correctly.
You could also try undervolting your cards, should save you ~ 10* each as well as some electricity.
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thehun (OP)
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January 08, 2014, 05:26:59 PM |
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I ran into the same issue with some 280X's. Mine turned out to be defective. The cooling pipes were cool to the touch while the GPU was getting to 90*+. The heat transfer plate and/or thermal paste weren't doing the job correctly.
You could also try undervolting your cards, should save you ~ 10* each as well as some electricity.
Thanks, I have tried undervolting with MSI Afterburner to 1.020V but I'm not seeing any difference (and cgminer keeps showing 1.250V so I'm not sure if it has actually done anything). Now I have fixed a case fan to the side of the crate and temp has gone down for most GPUs but GPU3 is still between 88 and 90° ![Undecided](https://bitcointalk.org/Smileys/default/undecided.gif) I really hope the card isn't KO...
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mikeybit
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January 08, 2014, 05:44:24 PM |
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I ran into the same issue with some 280X's. Mine turned out to be defective. The cooling pipes were cool to the touch while the GPU was getting to 90*+. The heat transfer plate and/or thermal paste weren't doing the job correctly.
You could also try undervolting your cards, should save you ~ 10* each as well as some electricity.
Thanks, I have tried undervolting with MSI Afterburner to 1.020V but I'm not seeing any difference (and cgminer keeps showing 1.250V so I'm not sure if it has actually done anything). Now I have fixed a case fan to the side of the crate and temp has gone down for most GPUs but GPU3 is still between 88 and 90° ![Undecided](https://bitcointalk.org/Smileys/default/undecided.gif) I really hope the card isn't KO... Some of the 7950's are voltage locked so you might not be able to alter it in Afterburner. If you do a search, you might find a few ways to either edit the BIOS using a hex editor or flash it to a BIOS that's unlocked.
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SpeedDemon13
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January 08, 2014, 05:50:32 PM |
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Only suggestion it to separate them apart a little more and add a spot fans to cool them or water cool them.
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CRYPTSY exchange: https://www.cryptsy.com/users/register?refid=9017 BURST= BURST-TE3W-CFGH-7343-6VM6R BTC=1CNsqGUR9YJNrhydQZnUPbaDv6h4uaYCHv ETH=0x144bc9fe471d3c71d8e09d58060d78661b1d4f32 SHF=0x13a0a2cb0d55eca975cf2d97015f7d580ce52d85 EXP=0xd71921dca837e415a58ca0d6dd2223cc84e0ea2f SC=6bdf9d12a983fed6723abad91a39be4f95d227f9bdb0490de3b8e5d45357f63d564638b1bd71 CLAMS=xGVTdM9EJpNBCYAjHFVxuZGcqvoL22nP6f SOIL=0x8b5c989bc931c0769a50ecaf9ffe490c67cb5911
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rwessels
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January 08, 2014, 06:41:08 PM |
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I have setups like this, but the key was to not have any one fan blow on another card. So I mounted two cards on the outsides of the crate (one upside down) so they blow away. Then I mounted the middle two flat so they were facing up. Solved all of my temperature problems.
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mikeybit
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January 08, 2014, 07:33:00 PM |
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I have setups like this, but the key was to not have any one fan blow on another card. So I mounted two cards on the outsides of the crate (one upside down) so they blow away. Then I mounted the middle two flat so they were facing up. Solved all of my temperature problems.
The fans are generally intake fans, but the idea is the same. I still could not get a 280x I had to not overheat, regardless of how much *COLD* (8*F outside) air was blowing on it.
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thehun (OP)
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January 08, 2014, 07:50:56 PM Last edit: January 08, 2014, 08:25:53 PM by thehun |
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Some of the 7950's are voltage locked so you might not be able to alter it in Afterburner. If you do a search, you might find a few ways to either edit the BIOS using a hex editor or flash it to a BIOS that's unlocked.
I have managed to undervolt now using Sapphire Trixx and it seemed to do the trix ![Tongue](https://bitcointalk.org/Smileys/default/tongue.gif) . Temperatures have fallen to ranges around 70° (75° for GPU3) after reducing voltage to 1.1V (reducing to 1.025 made the system unstable). However now I have another problem. GPU0's hashrate has fallen to 455KH although all settings seem to be ok edit: it was actually because of Trixx that was hogging the GPU. Shut it down and back to normal :-)
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thehun (OP)
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January 08, 2014, 07:53:09 PM |
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Only suggestion it to separate them apart a little more and add a spot fans to cool them or water cool them.
I added two small case fans and all I managed to reduce was a few °C (2° on the hottest one). I have been looking at liquid cooling but it doesn't seem easy nor cheap ![Undecided](https://bitcointalk.org/Smileys/default/undecided.gif)
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thehun (OP)
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January 08, 2014, 07:53:56 PM |
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I have setups like this, but the key was to not have any one fan blow on another card. So I mounted two cards on the outsides of the crate (one upside down) so they blow away. Then I mounted the middle two flat so they were facing up. Solved all of my temperature problems.
Sounds interesting, but I think my risers are not long enough to take the cards out...
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kalus
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let's make a deal.
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January 08, 2014, 08:28:22 PM |
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I have setups like this, but the key was to not have any one fan blow on another card. So I mounted two cards on the outsides of the crate (one upside down) so they blow away. Then I mounted the middle two flat so they were facing up. Solved all of my temperature problems.
Sounds interesting, but I think my risers are not long enough to take the cards out... then hang them at 90° from how you have them already so you can use the length of the milk crate to space them out. just give it a shot to see if it works; stability >> pretty
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DC2ngEGbd1ZUKyj8aSzrP1W5TXs5WmPuiR wow need noms
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