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Changed tim and cleaned heatsink on my 6850, fan stopped working

post #1 of 9
Thread Starter 
Hi all,
My 6850 was running very hot ( This the one btw, http://www.sapphiretech.com/presentation/product/?pid=497&lid=1)
100C at full load.
Roughly 2 years old.
I removed the heatsink and shroud to clean it all up. I saw that the TIM was a bit too dry and thin. So I replaced it with the TIM I got with my Hyper 212+. The screws for the shroud are very small and being lazy I just put the heatsink on and didn't screw in the shroud. I booted it up and the temps were terrific. 70C at full load in Skyrim w/ ENB. The fan was also running fine but after a while it started dropping.

I checked a few hours later and the fan had dropped to 100RPM once. I don't have any profile on in Afterburner but still 100RPM is too low and afterburner showed me that it wanted to set the fan at 25%.

TL;DR: Currently running the fan at 100% allows me around 2800~3000 RPM. Earlier it ran at 4000RPM. When not on load and fan on auto it drops sub 100 RPM (58 was the lowest today redface.gif )

Any help? Should I try RMA?
post #2 of 9
does the fan spin freely when you spin it with your hands or is it very stiff?
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post #3 of 9
The shrouds usually do contribute to airflow so it would be better if you kept it on.

As Pheno said you want to check whether the fan spins freely, if it's a little stiff (which can be the case over 2 years of use) then you want to re-lube the bearing inside it. Either that or RMA and let the manufacturer repair it for you
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post #4 of 9
Thread Starter 
Spins freely. Going from 70% to 40% just made the fan spin down to a 100 RPM and then it stopped. Giving a nudge with my finger worked though.
post #5 of 9
how freely is the fan spinning? is there any momentum in the fan?
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post #6 of 9
Thread Starter 
The momentum is fine. Note that it was working properly before I removed the heatsink to clean it. One thing I've noticed is that if it tries to change fan speeds to fast it starts to spin too low or just stops spinning. Anything above 3000RPM and it stops working properly makes some throttling noises and spins down to sub 100~500 RPM. Giving it a nudge improves the speed somewhat. Currently at 80% fan settings its spinning at around 2.2k RPM for about an hour. Earlier it used to be around 3k RPM at 80%.

Can I still RMA if I've removed the heatsink once and replaced the TIM? or will they know?
post #7 of 9
Thread Starter 
Just rocked the case a bit hard. Fan at 3.3k at 81% :|
post #8 of 9
i think the bearing is dry and sometimes its stuck on the bearing walls. those sapphire fans are known to dry up.

BTW i have found a link to fan replacement on ebay: http://stores.ebay.com.au/cooler-fan-shop/_i.html?_nkw=sapphire&submit=Search&_sid=849407102

If you can RMA then that would be best. they would probably send you a HD 7770 or something.
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post #9 of 9
Thread Starter 
Could some of the dust bunnies got lodged inside the fan from the bottom while I was cleaning? I didn't know how to remove the fan so I just cleaned it withou taking it off
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