HD 4850 temprature.

[NRF]

Hi All,

I am rather new to mining (and bitcoin's in general).  I have been experimenting with my desktop (HD 7750) and my notebook (HD 7650M), all is going well, learning heaps.

Anyway, I pulled out an old machine of mine for a bit more horsepower.  It has a HD 4850 and probably is not worth the watt's but I am learning and I thought why not.  From memory it was always ran hot but the numbers I am seeing are more that what I was expecting.  At full load with fan at 100% it pumps out about 70 MHash but it wants to run at 95c.

I have goggled, and read various bits.  I realise that it is older technology (and runs hotter than the 7XXX's I have), and it probably needs a clean but wow 95c!  I have stopped mining on it till I clean it and get advice fro you guys.

So, the questions are;-

1. How hot do HD 4850's normal run?  (I have seen a lot or exaggeration on the net, go figure)

2. What is the best way to clean these things?

Thanks

[1714931198]

1714931198

[1714931198]

1714931198

[1714931198]

1714931198

[1714931198]

1714931198

[racerguy]

tried underclocking the memory and undervolting a little?  Might have to lower core clock a little too.

[NRF]

tried underclocking the memory and undervolting a little?  Might have to lower core clock a little too.

I was planning to try that, do you have any setting's that you have used with a 4850 that I can start from?

[Shadow383]

Turn it off, take it out and give it a blast with an air duster before you do anything else 
You shouldn't get above 80 degrees on a 4850, they're not terribly powerful cards, and I'd be surprised if it survived more than a couple of months if 90+ mining

[flatronw]

I still have a functioning Sapphire 4850 x 2 sitting around. It was always like a furnace. In all the time I used it (4 monitors) there was no way to cool it but underclocking it. I can remember that the single 4850 was also a Hot running card.  I think the Heatsinks/Coolers were just not up to the task and the fans sounded like Jet engines.
Anyway it nice to know somebody else has what is now an antique Video cards still working.

[Ilikeham]

It's a an older tech card and without knowing who made it or what fan set up it has ;

4850 and 70's are hot and do run hot. Clean the thing up well and apply fresh thermal grease. Use the manufacturers utility to set the fan speed higher if need be. Underclock the memory if it all possible. Even if it's not Sapphire brand , try Trixx or whatever else suits you. If you're just going to mine with the thing, stick it in the basement and have a fan blowing right on the card.

It's not the chip temps I'd be worried about, just the power circuitry really. 90 is not really smoking hot for that chip. Aim for 80's and GPU-z is you friend for reading the cards onboard sensors to see what the other non core parts of the card are running at heat wise.

[yjacket]

When i first starting mining, around 1 year ago, I had a 4890. Overclocked it and got 105mh. Poor thing ran at 100C for months until i pulled the plug when it became unprofitable. 48xx series runs very hot, but I wouldn't worry about it.

[NRF]

When i first starting mining, around 1 year ago, I had a 4890. Overclocked it and got 105mh. Poor thing ran at 100C for months until i pulled the plug when it became unprofitable. 48xx series runs very hot, but I wouldn't worry about it.

I had come to the same conclusion myself after a pile of research and help from you guys here, it is one of those very old Sapphire ones.  They just run hot and that's it.

Like I said, I only fire it up to test things and I am too chicken to run it constantly.  I only wish I could work out a way to mount my Coffee mug on it, it would certainly save me from having to boil the kettle  .

Anyways, thanks guys for you help.