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Author Topic: iMac with 6750M  (Read 2367 times)
Stupidpal
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July 15, 2011, 01:32:31 PM
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I mine with my iMac using poclbm in Windows. I've overclocked the core clock to 870 MHz and underclocked the memory to 300 MHz. I've also increased the ODD fan speed so that the GPU temp stays stable at around 60 C. It doesn't always run 24/7, I give it a rest now and then. I want to know, is this dangerous for the computer? As in will it's effects start showing soon?  Huh

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July 16, 2011, 05:52:34 AM
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From what I know it's a bad idea to mine with an iMac. And iMac does not have good ventilation and you can burn out your card that way. I've heard people doing that. Plus, you are likely just getting <100 Mhash/s, right? Not worth it.

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July 16, 2011, 05:54:34 AM
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The card will burn out even at 60 C?  Shocked I'm getting ~110 mhash/sec with this config.

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July 16, 2011, 06:02:36 AM
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I don't know many people that mine with an iMac. And I have heard people burning out their cards. Don't know how hot their cards are though. I have an iMac with a 5750. I was getting 77 mhash/s. Once I heard the story of someone's iMac dying, I stopped mining on mine. Not worth it... so I just got a dedicated miner.

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July 16, 2011, 06:05:01 AM
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I'm waiting for the PCI Expansion Chassis now:

http://www.sonnettech.com/news/nab2011/

I could attach a good mining card and use that  Grin

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July 16, 2011, 07:45:09 AM
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I don't see how it would be a problem as long as the temperature stays low.

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July 16, 2011, 02:24:05 PM
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I don't see how it would be a problem as long as the temperature stays low.

Mobile VRM's aren't designed for 24/7 stress at 100% (or more if overclocked). The ventilation is designed expecting normal pauses every now and then.
 
In general it's a horrible idea trying to mine continuously with an iMac GPU.

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Stupidpal
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July 16, 2011, 04:33:37 PM
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Yeah I'll give it a rest every now and then.

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July 19, 2011, 07:03:58 PM
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I don't see how it would be a problem as long as the temperature stays low.

Mobile VRM's aren't designed for 24/7 stress at 100% (or more if overclocked). The ventilation is designed expecting normal pauses every now and then.
 


Notebooks also need to be stable on 24/7 stress. THere are desktop machins which fail at permanent load and there are notebooks which fail.
My notebook with t7400 and Nvidia 9700GT is old, but it can stand 24/7 load too.
THe temps are fine, in contrast to the HD5850 in my mining ring, its stable too, but becomes very hot.
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