Avalon A7 announced

[fusion0389]

Also looking for cheapest available PSU for 741

Will test 3 different setups soon:

Bitmain APW3++ (expensive and not available in stock, I will not buy them anymore)

G1029-1600W 120$ (chinese ebay stuff)

2x Zalman ZM700-LX 700W 130$  (Looks good, 2 year warranty. I think this is the way to go)

Also does 741 really need 1300W PSU ?

Take it from someone with experience... avoid ATX PSU's. just do it the right way with commercial grade equipment. The BITMAIN APW3++ is a good all in one choice. Whatever you get, make sure you leave yourself some overhead. For instance, if your device pulls 1000 watts at full load, get yourself a 1200 watt+ PSU. I like to stay at or under 80% of the rated load of the PSU for efficiency and reliability reasons. Its worked well for me.

Parallel Miner offers a PSU with 2400 watts of max output, that's enough to handle two L3's, maybe two 741's depending on what clockspeed setting you choose.

[Logan4el]

Why I should avoid ATX psu's?

[tbonetony]

Why I should avoid ATX psu's?

ATX PSU's are designed for home / office computers, meaning they are not the most suitable for 24/7 operations like a server does. They could run 24/7, but will die much faster (i.e. in a year or two) than what they usually are advertised, i.e. 10 years warranty, etc.

[Logan4el]

Why I should avoid ATX psu's?

ATX PSU's are designed for home / office computers, meaning they are not the most suitable for 24/7 operations like a server does. They could run 24/7, but will die much faster (i.e. in a year or two) than what they usually are advertised, i.e. 10 years warranty, etc.

ATX PSU - 2 years warranty
Used server PSU - no warranty
Bitmain - 3 months
China noname server PSU - no warranty

So why not?

[goose1072]

I totally understand that an ATX PSU are for home/ office but I have ran my current computer from Dell for the last 4 years 24/7 without a hiccup.
I have also seen servers PSU's crap out after a year or 2.
I am currently running 2 ATX PSU's at way below running temps in my server room which I keep at 70 F, my Avalon is at 21-29 c at all times and never above that.
I would love to do a server PSU but don't want to currently spend $300-$400 just for a power supply.
I have a few HP/Dell power supplies and looking to see if they can be used instead of buy new ATX ones.
I have also seen that anything above 1400W will require 208v-220v and I can't do those since they are currently being used on servers.
I have a ton of 120v outlets that work and need the PSU to be the same.

[soothaa]

Why I should avoid ATX psu's?

ATX PSU's are designed for home / office computers, meaning they are not the most suitable for 24/7 operations like a server does. They could run 24/7, but will die much faster (i.e. in a year or two) than what they usually are advertised, i.e. 10 years warranty, etc.

Totally false. I have been doing this since 2013. I have never had a properly maintained quality ATX PSU die on me. I have run probably close to three dozen of them of various brands and makes and if you buy quality and do not run them at 100% capacity you will not have any problems!

Let's take this one step further. I have several ATX PSUs from Corsair, running since 2014 at 130% of rated capacity and they are STILL going strong!

[813bits]

How hot do the 741's run?  Are they like the Bitmain S7's and S9's in regards to heat and noise?

[tbonetony]

How hot do the 741's run?  Are they like the Bitmain S7's and S9's in regards to heat and noise?

Cooler than S9 based on displayed stats.
Somewhat quieter than S9 due to lower running temps.

[fusion0389]

Why I should avoid ATX psu's?

ATX PSU's are designed for home / office computers, meaning they are not the most suitable for 24/7 operations like a server does. They could run 24/7, but will die much faster (i.e. in a year or two) than what they usually are advertised, i.e. 10 years warranty, etc.

ATX PSU - 2 years warranty
Used server PSU - no warranty
Bitmain - 3 months
China noname server PSU - no warranty

So why not?

I had the same thought process initially too.... I bought MANY platinum rated 1200 watt ATX PSU for a GPU rig that only used 950-1000 watts. Overall quality was poor, I think the weakest link is the cables. I had approximately a 20% failure rate using multiple brands. Even though all issues were resolved via warranty, I still had to pay shipping and wait 4 weeks for them to receive the psu, fix it, and send me another one. The down time does indeed "cost" money.

On the flip side I purchased a commercial 2400 watt psu including breakout boards and cables for $109 with free shipping. Not only is it more efficient, but it costs less, and I can run two GPU rigs, two L3's, two Avalon 741's, etc off the same PSU which further reduces cost. Never had an issue with any of the 2400 watt or 2000 watt psus I've purchased and I've been running them for at least a year. That is significant especially considering they are refurbs. The only PSU that have given me issues are brand new ATX psu's with warranty.

[tbonetony]

Why I should avoid ATX psu's?

ATX PSU's are designed for home / office computers, meaning they are not the most suitable for 24/7 operations like a server does. They could run 24/7, but will die much faster (i.e. in a year or two) than what they usually are advertised, i.e. 10 years warranty, etc.

ATX PSU - 2 years warranty
Used server PSU - no warranty
Bitmain - 3 months
China noname server PSU - no warranty

So why not?

A while ago warranty would actually cover any breakdown. These days, the public becomes aware of crypto mining. I have heard PSU manufacturers refused warranty due to the intensive use in mining. PSU lifespan is largely dependent on operating times as well as intensity of use.

I have used Corsair, EVGA, Rosewill and other no name brands. Don't get me wrong, I still use some of them for my R4's, but for S9 and A741's, I have switched to IBM-2880. Not only I would gain in power efficiency, but also save on space and infrastructure costs.

[c-none]

I wonder if did these guys stopped working or not.

I badly need ASIC devices and I can not find one((

[Logan4el]

Why I should avoid ATX psu's?

ATX PSU's are designed for home / office computers, meaning they are not the most suitable for 24/7 operations like a server does. They could run 24/7, but will die much faster (i.e. in a year or two) than what they usually are advertised, i.e. 10 years warranty, etc.

ATX PSU - 2 years warranty
Used server PSU - no warranty
Bitmain - 3 months
China noname server PSU - no warranty

So why not?

A while ago warranty would actually cover any breakdown. These days, the public becomes aware of crypto mining. I have heard PSU manufacturers refused warranty due to the intensive use in mining. PSU lifespan is largely dependent on operating times as well as intensity of use.

I have used Corsair, EVGA, Rosewill and other no name brands. Don't get me wrong, I still use some of them for my R4's, but for S9 and A741's, I have switched to IBM-2880. Not only I would gain in power efficiency, but also save on space and infrastructure costs.

How do they know it has been used in mining to refuse warranty? 

[tbonetony]

Why I should avoid ATX psu's?

ATX PSU's are designed for home / office computers, meaning they are not the most suitable for 24/7 operations like a server does. They could run 24/7, but will die much faster (i.e. in a year or two) than what they usually are advertised, i.e. 10 years warranty, etc.

ATX PSU - 2 years warranty
Used server PSU - no warranty
Bitmain - 3 months
China noname server PSU - no warranty

So why not?

A while ago warranty would actually cover any breakdown. These days, the public becomes aware of crypto mining. I have heard PSU manufacturers refused warranty due to the intensive use in mining. PSU lifespan is largely dependent on operating times as well as intensity of use.

I have used Corsair, EVGA, Rosewill and other no name brands. Don't get me wrong, I still use some of them for my R4's, but for S9 and A741's, I have switched to IBM-2880. Not only I would gain in power efficiency, but also save on space and infrastructure costs.

How do they know it has been used in mining to refuse warranty? 

I don't have that knowledge. I guess it would have to be with one's integrity in most part. Plus if a PSU is claimed to be 1 year old but parts inside are tested to be much "older" than average, they would know it's been used in intensive activities. I am sure you hear lots of terms like "Fair Use Policy" in seemingly unlimited cellphone data plans. and there could be fine prints thay people are not aware of when they assume "warranty" to be unconditional.

[NotFuzzyWarm]

Baaaack on-topic about the A7's...
Had my first problem with one today. Also not sure if *any* non-user caused problems have been reported here.

Anywho, the fan on an A721 that I got late Feb this year died today. On Monday I had heard it rattling and thought fan might be clipping something but since still ran fine, left to be looked at later.

Turns out the fan bearing is kerput so the fan and rotor are just floating around. Time to make aTicket with Canaan about it.

Fan is a Cooler Master A12038-60BB-4RP-F1 rated 12V 2.7A, 4-wire PWM.
Already searched and that is a non-standard part so hope Canaan has some. In the meantime I have a bucket load of retired s7's here so maybe will try a fan from one. Since both are for high pressure with high CFM usage bet it works

[NotFuzzyWarm]

Got a ticket in with Canaan and they already responded saying it might still be under warranty which case they will ship me a fan for free.

In any event, pulled a fan from one of my offline s7's and aside from the fan wires being a hair too short to run directly to the mainboard and too long to plug into the header by the fan and still be able to secure the header (very minor thing) it works perfect. The miner is actually running a couple deg cooler than its brothers sitting next to it

[goose1072]

Awesome, Good to know.

I ordered 2 Avalon's on Wednesday morning and they already shipped out!
That was very quick, Canaan is awesome!

[mawk01]

Awesome, Good to know.

I ordered 2 Avalon's on Wednesday morning and they already shipped out!
That was very quick, Canaan is awesome!

Man....I ordered 2 on Monday....I said I would pay by BTC....and still haven't heard back...

[727miner]

Awesome, Good to know.

I ordered 2 Avalon's on Wednesday morning and they already shipped out!
That was very quick, Canaan is awesome!

Man....I ordered 2 on Monday....I said I would pay by BTC....and still haven't heard back...

Ditto..I contacted them yesterday and got this response from Jasmine..

He is working on BTC payment. And will send to you the address and amount asap. Lily has so many responsibilities, he's so hard working guy.

jasmine

[goose1072]

Lily is a guy??? Wow! 

I made a direct payment from my bank.
Much quicker than the first time I ordered.
I already have a tracking number too.

[Elphamyto]

Awesome, Good to know.

I ordered 2 Avalon's on Wednesday morning and they already shipped out!
That was very quick, Canaan is awesome!

Man....I ordered 2 on Monday....I said I would pay by BTC....and still haven't heard back...

Ditto..I contacted them yesterday and got this response from Jasmine..

He is working on BTC payment. And will send to you the address and amount asap. Lily has so many responsibilities, he's so hard working guy.

jasmine

I've been waiting since Monday for this Lily to get back to me for btc payment instructions. It's starting to look like I'll be waiting until next week just to make the payment (hopefully), which is mildly disappointing...