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Topic: Avalon 7 - page 2. (Read 22560 times)

legendary
Activity: 1498
Merit: 1030
November 16, 2016, 08:56:43 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.
legendary
Activity: 3080
Merit: 1080
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.

legendary
Activity: 4116
Merit: 7849
'The right to privacy matters'
November 16, 2016, 04:45:22 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
jr. member
Activity: 62
Merit: 5
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.
legendary
Activity: 4116
Merit: 7849
'The right to privacy matters'
November 15, 2016, 08:01:51 AM
O ordered 2 and I am still waiting for my payment email.
legendary
Activity: 2436
Merit: 1706
Electrical engineer. Mining since 2014.
November 15, 2016, 01:58:36 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.
legendary
Activity: 1498
Merit: 1030
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.
sr. member
Activity: 350
Merit: 250
November 14, 2016, 10:18:51 PM

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.
legendary
Activity: 3318
Merit: 1848
Curmudgeonly hardware guy
November 09, 2016, 10:49:24 AM
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.
legendary
Activity: 4116
Merit: 7849
'The right to privacy matters'
November 09, 2016, 10:37:30 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.

legendary
Activity: 2436
Merit: 1706
Electrical engineer. Mining since 2014.
November 09, 2016, 09:45:12 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.
legendary
Activity: 4116
Merit: 7849
'The right to privacy matters'
November 09, 2016, 09:42:35 AM
I wonder if the software will allow for undervolt and down clock like the a4
legendary
Activity: 2436
Merit: 1706
Electrical engineer. Mining since 2014.
November 09, 2016, 06:09:24 AM
I wonder if AvalonMiner 741 with more chips could be a little more efficient with efficiency friendly settings.
Maybe 7Th/s / 900W ?
yxt
legendary
Activity: 3528
Merit: 1116
November 09, 2016, 04:20:39 AM
I know that  Wink

88 chips wouldn't be double anything... 721 has 72x A3212 asics
hero member
Activity: 578
Merit: 501
November 09, 2016, 12:28:30 AM
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
legendary
Activity: 3528
Merit: 1116
November 08, 2016, 11:20:45 PM
there is no 100 MOQ


... 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
hero member
Activity: 786
Merit: 1000
November 08, 2016, 08:59:45 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.
legendary
Activity: 2436
Merit: 1706
Electrical engineer. Mining since 2014.
November 08, 2016, 12:11:15 PM
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.
legendary
Activity: 1344
Merit: 1023
Mine at Jonny's Pool
November 08, 2016, 11:36:36 AM
My hosting provider told me there was MOQ of 100 units.  I sure hope that information is incorrect!
legendary
Activity: 4116
Merit: 7849
'The right to privacy matters'
November 08, 2016, 11:13:48 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.
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