Avalon 7 - page 2. | Bitcointalksearch.org

QuintLeo

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Activity: 1498

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Quote from: allinvain on November 16, 2016, 07:54:47 PM

I wonder if the PCIE jacks on these are strong enough to handle the current flowing through just two plugs per board. I would use 16 AWG cables from the PSU so I'd have 4 PCIE cables per system, 2 per board.

125 watts or less per connector?

Trivial - the PCI-E standard for 8-pin connections uses the *SAME* 3 pins for 12VDC as the 6-pin connection yet is rated by the PCI-E group at 150 watts.
The actual CONNECTORS used for the PCI-E 6-pin connections are rated at 288 watts - the PCI-E standard is EXCESSIVELY conservative in rating them at 75 watts.

As far as A7 reliability - there is NO track record for it, though the A6 had a generally good record which implies but does NOT specify that the A7 should as well.

allinvain

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Activity: 3080

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I wonder if the PCIE jacks on these are strong enough to handle the current flowing through just two plugs per board. I would use 16 AWG cables from the PSU so I'd have 4 PCIE cables per system, 2 per board.

philipma1957

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Activity: 4158

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'The right to privacy matters'

Quote from: revolution82 on November 16, 2016, 03:23:28 PM

This may be a question for a different string but with the Avalon 7 using under 1KW do you need to connect the PSU to every available connection? I assume yes but I have a bunch of 1300w power supplies with only 6 PCIe cables.

well my guess is take 4 of your six cables and plug them in to separate corners

then find quality splitters for the other 2 cables turning them into 4 plugs

then every board has 1.5 cables

like this which maybe good

revolution82

jr. member

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This may be a question for a different string but with the Avalon 7 using under 1KW do you need to connect the PSU to every available connection? I assume yes but I have a bunch of 1300w power supplies with only 6 PCIe cables.

philipma1957

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'The right to privacy matters'

O ordered 2 and I am still waiting for my payment email.

HagssFIN

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Activity: 2436

Merit: 1706

Electrical engineer. Mining since 2014.

Quote from: QuintLeo on November 15, 2016, 12:26:16 AM

Downclocking by itself has almost no effect on efficiency.

Undervolting (where it works) is where the efficiency gains happen, but usually requires downclocking for the item to work at all when undervolted quite a bit.

Exactly.

QuintLeo

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Activity: 1498

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Downclocking by itself has almost no effect on efficiency.

Undervolting (where it works) is where the efficiency gains happen, but usually requires downclocking for the item to work at all when undervolted quite a bit.

Goms

sr. member

Activity: 350

Merit: 250

Quote from: HagssFIN on November 09, 2016, 09:45:12 AM

Yep, that also raises the question if undervolting and downclocking could lead for a better efficiency.
For example if you could run one A7 5000Gh/s, 600W.
That would bring us to 0.12Gh/s per watt efficiency.

I know downclocking makes your rig last longer because there is less heat.
If you do not downclock too much, it will have no effect on the efficiency.

sidehack

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Activity: 3318

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Curmudgeonly hardware guy

72 chips across 2 boards means 36 chips per board. Based off what I've seen, 14/16 likes the 0.4-0.5V range, and there's no good way to stack 36 chips into 12V to get this. I wouldn't be surprised if it was a regulated string of 2x18 chips per board with a dual-phase buck in the 8V 25A-per-phase neighborhood. If that's the case, undervolting might be possible - either directly through the config like the Avalon4, or by a hack like S7.

philipma1957

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'The right to privacy matters'

Quote from: HagssFIN on November 09, 2016, 09:45:12 AM

Quote from: philipma1957 on November 09, 2016, 09:42:35 AM

I wonder if the software will allow for undervolt and down clock like the a4

Yep, that also raises the question if undervolting and downclocking could lead for a better efficiency.
For example if you could run one A7 5000Gh/s, 600W.
That would bring us to 0.12Gh/s per watt efficiency.

the avalon 4 did this.

to me in house 1 unit quiet.---- 4-5th
1 unit quiet in my friends office. 4-5th

5 to 10 units top speed in the solar array 6th

above is the goal.

HagssFIN

legendary

Activity: 2436

Merit: 1706

Electrical engineer. Mining since 2014.

Quote from: philipma1957 on November 09, 2016, 09:42:35 AM

I wonder if the software will allow for undervolt and down clock like the a4

Yep, that also raises the question if undervolting and downclocking could lead for a better efficiency.
For example if you could run one A7 5000Gh/s, 600W.
That would bring us to 0.12Gh/s per watt efficiency.

philipma1957

legendary

Activity: 4158

Merit: 8049

'The right to privacy matters'

I wonder if the software will allow for undervolt and down clock like the a4

HagssFIN

legendary

Activity: 2436

Merit: 1706

Electrical engineer. Mining since 2014.

I wonder if AvalonMiner 741 with more chips could be a little more efficient with efficiency friendly settings.
Maybe 7Th/s / 900W ?

yxt

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Activity: 3528

Merit: 1116

I know that Wink

88 chips wouldn't be double anything... 721 has 72x A3212 asics

in2tactics

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Activity: 578

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I am not happy with these numbers at all. 6TH at 900W for $888. At this point, the only good point is that it should be of much higher quality than offerings from BMT.

yxt

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Activity: 3528

Merit: 1116

there is no 100 MOQ

Quote from: philipma1957 on November 08, 2016, 11:13:48 AM

... do you still work with Yang of block_c in San Francisco ?

Or must we order direct from China?

Lastly if I buy 2 or 3 or 4 and something breaks will I need to do warranty with China?

I am in NJ and shipping to China is costly.

I had bad luck with the S9 and would like to load up with your gear. I just do not want to have same issues of breakdowns and have to send gear to China for warranty service.

I don't know about blockC
But A7 is much more reliable than the S9

ATCkit

hero member

Activity: 786

Merit: 1000

Quote from: allinvain on November 07, 2016, 08:18:09 PM

I hope there is no MOQ. I may do a group buy if anyone is interested in having them hosted with me at CryptoBoreas (Labrador). But if not and there is someone trustworthy that will do a group buy, I'd be interested.

Alan,
I'll have to tumble the numbers. If they're ok, I'd join in your group buy if there's a MOQ.

HagssFIN

legendary

Activity: 2436

Merit: 1706

Electrical engineer. Mining since 2014.

100 units! Shocked

If that is true, I hope that they still have some eye for the game to support home miners and take a community group buy with a smaller quantity (like for example 10 units MOQ).

edit, found this:

https://github.com/Canaan-Creative/cgminer/blob/master/driver-avalon7.h

Quote

#define AVA7_MM741_ASIC_CNT 22
...

#define AVA7_DEFAULT_MINER_CNT 4

See this code.
There is also a 88x A3212 chip version of the Avalon7. Huh

Canaan Creative AvalonMiner 741.

jonnybravo0311

legendary

Activity: 1344

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Mine at Jonny's Pool

My hosting provider told me there was MOQ of 100 units. I sure hope that information is incorrect!

philipma1957

legendary

Activity: 4158

Merit: 8049

'The right to privacy matters'

Quote from: yxt on November 08, 2016, 08:04:53 AM

afaik no MOQ

good. next question do you still work with Yang of block_c in San Francisco ?

Or must we order direct from China?

Lastly if I buy 2 or 3 or 4 and something breaks will I need to do warranty with China?

I am in NJ and shipping to China is costly.

I had bad luck with the S9 and would like to load up with your gear. I just do not want to have same issues of breakdowns and have to send gear to China for warranty service.

Topic: Avalon 7 - page 2. (Read 22566 times)