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Bitcoin / Mining / Re: If I overclock past 900 my mhash/s goes down even with good temps
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on: July 20, 2011, 03:29:58 AM
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You need higher voltage to support the higher frequencies.
Pushing the GPU past stock frequencies requires "extra voltage", and will also lead to slightly higher electricity costs.
Right now my three Gigabyte 6970s are set to 940Mhz with PowerTune at +5% (They have a higher voltage and 920Mhz clock by default), they get 420Mhash/sec.
My three Visiontek 6970's are reference model cards, thus with a default clock of 880Mhz. They too are running at 940Mhz, but since their default voltage is lower than the other cards, they need +15% PowerTune compared to my other cards at 5%.
The Gigabytes have three fans, but run much hotter because they do nothing to exhaust the hot air out of the case, so if you are reading this and are considering buying 6970 models with three fans, you might want to rethink that and get the single fan models.
My Visiontek cards run 25C cooler on average.
Gigabytes run from 80-90C
Visionteks are around 55-60C in a similar configuration.
So you will need to figure out whats right for your cards overclock in terms of voltage, because one cant properly overclock a card without setting the voltage with the newer cards.
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85
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Bitcoin / Mining / Re: Max OC for a 6970
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on: July 14, 2011, 04:28:33 PM
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im getting 420mhash per 6970. I have them OC to 950Mhz with voltage at 1175mv and mem at 800Mhz
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88
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Bitcoin / Mining / Re: PowerTune
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on: July 13, 2011, 09:55:14 PM
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I also need to give my cards extra power to achieve 420mhash
The three gigabytes come stock at 920mhz, they dont need extra power, i just OC them to 940mhz
The three visionteks i have are reference cards, They get 360mhash out of the box, and 420mhash with +10% power and 940mhz clocks
I forgot to mention.... The gigabytes get way too hot... They need extra cooling.... They have three fans but no vapour chamber... They blow all the hot air around inside the case. Temps 80C-90C with extra three fans for more airflow ontop of the three on each card. The Visionteks have a single fan but run 25C cooler because the hot air is exhausted out of the back of the card... They are also 10 times louder then the other cards. they run 60C-75C |
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89
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Bitcoin / Mining / Re: PowerTune
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on: July 13, 2011, 09:52:12 PM
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I also need to give my cards extra power to achieve 420mhash
The three gigabytes come stock at 920mhz, they dont need extra power, i just OC them to 940mhz
The three visionteks i have are reference cards, They get 360mhash out of the box, and 420mhash with +10% power and 940mhz clocks
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