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Title: Avalon 741 Overclock possible? Post by: DinosaurBit on November 14, 2017, 03:26:25 PM Hi there,
So a friend told me his friend (I know this makes a lot of friends) was able to overclock an Avalon 741 to 10 Th/s. Is that possible at all? Been looking around for a procedure to achieve this but couldn't find anything... I don't have enough knowledge regarding this specific ASIC to tell if it's the truth or not, so I'd like to have your opinion on this. Thanks! Title: Re: Avalon 741 Overclock possible? Post by: wavelengthsf on November 14, 2017, 03:30:17 PM Hi there, So a friend told me his friend (I know this makes a lot of friends) was able to overclock an Avalon 741 to 10 Th/s. Is that possible at all? Been looking around for a procedure to achieve this but couldn't find anything... I don't have enough knowledge regarding this specific ASIC to tell if it's the truth or not, so I'd like to have your opinion on this. Thanks! Set the voltage offset to +1 in the miner settings. However, this will increase the power draw and decrease the reliability of the unit so make sure you have adequate power (ie: greater than 1200watts) and cooling. Title: Re: Avalon 741 Overclock possible? Post by: DinosaurBit on November 14, 2017, 03:34:33 PM Thanks for your follow-up!
PSU can take up to 1600W, so shouldn't be an issue. What would you recommend for cooling? Title: Re: Avalon 741 Overclock possible? Post by: wavelengthsf on November 14, 2017, 04:02:06 PM Thanks for your follow-up! PSU can take up to 1600W, so shouldn't be an issue. What would you recommend for cooling? I don't overclock my avalons, so I'm not sure how hot it gets when running at this offset - but I'd want to keep the ambient temp as low as possible and make sure the machine is running as cool as it can be. Title: Re: Avalon 741 Overclock possible? Post by: fanatic26 on November 14, 2017, 07:29:09 PM No overclock will make them run at 10th reliably. Someone is full of crap.
Also with the Avalon being the least efficient 16/14nm miner, overclocking it and taking it even further out of its efficiency range is a terrible idea. Title: Re: Avalon 741 Overclock possible? Post by: Thetaj on November 15, 2017, 06:31:58 AM All I'm willing to say is that each 741s aren't created equal. Some of them will run at amazing speeds while others are just a little bit better than toasters. What Canaan does garuntee is 7.3th @ 0 offset. (which is pretty damn easy to achieve).
I do I have some avalons running at 9.5th@ +1 offset. But the power draw makes it less efficient than running at -2 and getting 7.5 Title: Re: Avalon 741 Overclock possible? Post by: ConnerM on November 15, 2017, 07:28:17 AM No overclock will make them run at 10th reliably. Someone is full of crap. Also with the Avalon being the least efficient 16/14nm miner, overclocking it and taking it even further out of its efficiency range is a terrible idea. I agree. We get a nice range between 7.9 and 8.1 from our (8) 741's at '0', and about 8.1 to 8.4 at '+1'. Temps run 28-31 and 86-91 at '+1'. This is with 50 degree ambient air coming in. Amperage draw per bank of (4) units is around 24amps (208v) at '0' and 27-28amps (208v) at '+1' so they do loose a margin of efficiency when they are overclocked. Almost certainly overclocking shortens the MTBF life of the units, but I could not say how much. Not really worth doing IMO. Title: Re: Avalon 741 Overclock possible? Post by: DinosaurBit on November 15, 2017, 08:42:27 PM Thanks for your feedback guys, much appreciated!
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