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Author Topic: Bad fan bearing - Sapphire HD 5850 Xtreme  (Read 4079 times)
phelix
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May 28, 2011, 03:16:24 PM
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Today I noticed the fan speed drop in one of my 5850s. When I put the miners to rest and the fan speed went down to idle speeds it made a loud buzzing noise and quite some vibration.

The card is not even two weeks old. I wonder if it happened because I ran it too hot, maybe 85°C.

With the card taken out I can feel additional resistance on rotating the fan by finger. With a strong push it even starts to vibrate.

I took off the fan and removed the sticker on the stationary part, trying to get some motor oil in there. There are some groove arround the center but I am not sure if it got to the bearing.

The noise seems to be better but even at 100% the fan runs more than a thousand rpms slower than the others. I really hope it is only the fan and nothing worse??

Of course I have it running again with the card underclocked and undervolted until I get a new fan. I will try to get one from Sapphire by warranty but sure will not send in the card.

Anyone ever experienced something like that? Recomendations for a replacement fan?

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May 28, 2011, 03:28:10 PM
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You should've returned it. Definitely faulty.
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May 28, 2011, 03:33:13 PM
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Is it full of cat hair? Tongue

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May 28, 2011, 04:22:13 PM
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Today I noticed the fan speed drop in one of my 5850s. When I put the miners to rest and the fan speed went down to idle speeds it made a loud buzzing noise and quite some vibration.

The card is not even two weeks old. I wonder if it happened because I ran it too hot, maybe 85°C.

With the card taken out I can feel additional resistance on rotating the fan by finger. With a strong push it even starts to vibrate.

I took off the fan and removed the sticker on the stationary part, trying to get some motor oil in there. There are some groove arround the center but I am not sure if it got to the bearing.

The noise seems to be better but even at 100% the fan runs more than a thousand rpms slower than the others. I really hope it is only the fan and nothing worse??

Of course I have it running again with the card underclocked and undervolted until I get a new fan. I will try to get one from Sapphire by warranty but sure will not send in the card.

Anyone ever experienced something like that? Recomendations for a replacement fan?

I had exactly the same issue. I set the fan manually to 100% since it seemed to work. The fan died 2 days later it seems, and with it the card. It is RMA'ed now. I assure you the card will not be able to throttle down in time when the fan suddenly dies while mining, so either replace the fan or RMA it. I chose to not RMA it initially due to prefering mining outcome, its all taking chances.

proud 5.x gh/s miner. tips welcome at 1A132BPnYMrgYdDaRyLpRrLQU4aG1WLRtd
phelix
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May 28, 2011, 05:07:24 PM
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Is it full of cat hair? Tongue
that's what I had hoped for at first =)

thanks for your input. I will replace it somehow asap. I really do not want to kill the card and I had not imagined that could happen so easy - a fan can die every day. I have a big 140cm fan in front of the card battery that should help a little and a temperature protection script so I will take the risk for a couple of days but closely monitor the fan speed.


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June 20, 2011, 08:14:50 AM
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continued on http://forum.bitcoin.org/index.php?topic=18111.0

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