If room temp is 95F I think you will have problems. I have one that rarely runs longer than 24 hours in 20C and unit intake temp is constantly at 28-30C for some reason. Will just go into idle status and not start hashing again until I cycle PSU. Another 841 in same environment runs fine. May be luck of the draw where some of these are more sensitive than others. I may also have a dud, but I'm interested in seeing others room vs intake temps.

I don't get how any of you guys are managing to stay running above 30C. My ambient room temp is around 20C with windows open and it's still been snowing here. I have a couple 841's daisy chained and one just stops hashing if the intake temperature reaches 30C, although I suspect something else may be wrong because it arrived with a dent and the fan seems to stop or slow considerably at random times. Last time it stopped hashing I was seeing temps at 28/133C with fan at 90RPM/100%. I am not sure why there is such a large difference in room vs intake temperature or why the fan reports it's at 100% at that speed.

I was going to purchase more of these, but if I am having problems in cool weather, it will be even worse in the Summer. I have some 821's outside in the shop that show intake around 15-20C. I was going to move everything out there and have them exhaust directly out of the building and keep a large box fan on the intakes, but a box fan on my 841's now is not reducing intake temperatures at all. I've been trying to blow cold air in and hot air out. They constantly run at 28-30C in a 20C room. Canaan said it was an intake temperature issue, but only one unit is affected.

What kind of outlet are you plugging it into and what's it rated for? These units will only work on 220~240V outlets unless using a transformer. At 240, each unit requires a little more than 8 amps. At 120, one of these can pop a 20 amp breaker if it's not dedicated. I sold all of my Whatsminer units. Too power hungry and you won't even make a profit unless electric is $0.12 kWh or cheaper. At $0.12 you'll make $5/month profit.

Can any of you guys post room temp vs machine temps? Curious to see. Intake temp on my 841's is constantly at 28-31C in a 20C room. One of them keeps going into idle status randomly and won't start hashing again until restarting PSU. Canaan support thinks it's the temperature. Intake in cgminer is roughly 10C higher than room temp and my room thermometer is directly behind the intakes.

I had an 821 that did the same thing. AUC3 lit blue and miner would light white and then stay yellow in idle status. It was a bad AUC cable. I didn't see anything wrong with it or the pin outs and even tried re-pinning, but no luck. Moving the cable around, sometimes the AUC3 would flicker red. Only replacement cable fixed it. Cable wire colors were slightly different than replacement and what I received with 841. Main LED on AUC3 should be lit green when it's properly communicating with controller. Blue only means the AUC3 is initialized, but won't show up in cgminer or detect any miners.

Turn them on, but don't turn them off.  Should be very little maintenance involved unless they are overheating or have some other issue. Most pools typically have a setting to receive alerts if hash rate drops below a certain level. Only real reason to stay on site would be for security. Even if problems did arise, you could set them up for remote management and power cycling. 40 units will be very loud and produce considerable heat, so if you're not the only one in the space, you may have problems. 

Anyone bypass the AUC3 yet? I've seen a few pi controllers floating around that say they bypass for Avalon 8, but appear to be older 4-pin that Parallel Miner was selling.

Now that's speculative...lol. He is not listed as one of the inventors on the patent. There are 5 other individuals who are. The only reason he filed to have SIPO review and retract Bitmain's patent is because Chinese law gives you the opportunity to do so when you are sued for patent infringement. He said he didn't file it by choice, but in response to their lawsuit.

I said design, not miner design, however Bitmain's patent is here if you want to read exactly what's covered:
http://211.157.104.77:8080/sipo_EN/search/detail.do?method=view&parm=16b414c21a2f19d11b2c18401bcd1a5f183a19561ad91be11a581c4c04792b231f5c21ba22572195236c20482755275723ca24be2221222525702494250d26c0274025822c3f29092a7c29a02d6d2d6f28fa2ed62bd12c892f482c34330947932f5c2c0a2ac731b9333c316c366534e7318235ee337934f1360837f03747371b371a34e231bf38f13b04390c3e0d3f6f39ea3dc63c573d6d3e683e4c26d918c33ffe3c523c273e354334405c47c545774302408e4423458d47a04688462b46a846ca46b2436f47554bcc49784a2d
https://patents.google.com/patent/CN105045364A/en

Lawsuit was announced back in August 2017 and there are direct quotes from Yang where he mentions filing appeals and an application to revoke Bitmain's patent in response to their lawsuit:
https://www.coindesk.com/former-bitmain-chip-designer-seeks-to-revoke-mining-giants-patent/

I'm sure SIPO could give you the docs if requested.

It's a bit odd that WhatsMiner has not sold anything directly for some time. You can only purchase from Pangolin and they are removing all branding from units and power supplies. They will not sell or ship to China, yet are located in China. Maybe the pending legal claims are why Kodak backed out of a purchase order if there is any truth to that either?

When Kodak first announced back at CES I saw different photos of them where one was a rebranded S9 and others looked like rebranded WhatsMiner units. They were different units in literature and what was at CES. You can tell by position of network port on the controller. If that's the case, I wonder why they also removed them from the power supply, which didn't appear to have any Kodak specific branding.

So the pending lawsuit with Bitmain over their serial power supply circuit patent ended? News to me cause I just read another article today that mentioned it.

1375w = 6.25 Amps wired as single phase 220V, 5.73 Amps at 240V.
You should be able to run 6 max if leaving 20% safety load (40 amps). 8 would be near 100% load at 220V or 240V and pushing it.

8/2 wire is what I use for 50 amp breakers and will safely handle 40 amps.

If you want to try pushing 100% breaker load, you'd need to run 6/2 wire, which can safely handle 55 amps.

You will probably not find an affordable PDU to run all of that off a single outlet. Most PDUs are rated at 20 or 30 amps max, so you'd need 2 PDUs and 2 outlets. May want to run two 30 amp breakers/outlets with 10/2 wire instead, which is rated to safely handle 30 amps. 

I believe the reason the stickers are being removed is due to a pending lawsuit with Bitmain over the design. Bitmain's former director of design started WhatsMiner after leaving Bitmain in 2016. This may also be why they are no longer limiting quantities, offering discount coupons, and trying to offload as quick as they can. Other reason for offload is due to more efficient miners coming on the market in Q2/Q3, which will make these even less profitable.

It's just how WooCommerce works with holding stock and pending orders. It doesn't subtract actual stock until an order is changed to processing. That doesn't happen until payment is confirmed.  The remaining few that you could still add to cart but not checkout were most likely stock from pending orders paid with BTC that didn't confirm yet. The message I saw showed pending orders cancelling after 80 minutes and I was able to checkout then. When the site is essentially under a DoS attack, it will make it more difficult.

WooCommerce at it's finest. Did the guy complaining about Pangolin's Woo try getting one of these? lol

I had to automatically keep adding to cart for over an hour straight when there were only 6 left because of stock hold and everyone else doing the same. Once in cart, I had on auto-refresh and it would sometimes show the checkout but never go through due to pending orders/held stock. Sometimes it'd show FTP login too, so site was getting hammered. After an hour, others seemed to have given up, I checked out fine, and there were still a few left.

Every single company using WooCommerce does. That includes Parallel, Blokforge, and hundreds of thousands more.

Your issue is that WooCommerce doesn't subtract stock counts on the frontend from pending orders. If they have a bunch of orders that are in pending status, which is the initial status they go into, it will still show stock as being available until those orders change to processing. That stock isn't necessarily available though (it's pending), which is why it complains after trying to add to cart. Again, WooCommerce order status doesn't change from pending to processing until payment is confirmed and then stock is reduced. They had information posted previously that stated they were clearing unpaid pending orders every 80 minutes.

If you're this pissed cause you're not quick enough, imagine how pissed you'd be if there was no stock check in place for pending orders, they let your order go through, and then they send you an email days later saying it was cancelled because someone paid before you and there's no stock left. Not only do you not get your order, but you would most likely lose whatever BTC you paid in tx fees. It works the way it does for a reason.

If you understand WooCommerce order statuses, and it's saying there's stock available, letting you add to cart, but not letting you checkout, then you'd know that stock is pending and that you should leave it in your cart and keep trying to checkout as it may become available once pending orders are cleared. When it's completely out of stock, you can't even add to your cart. Reducing stock for pending orders would most likely result in you never getting a chance to add to cart and always showing out of stock immediately.

If you don't like it, simple solution is to use an extension or write a script that posts the form data automatically and non-stop until successful. Chances are multiple people are already doing that and that's why it's difficult to order.

Both of my boards have all the connectors soldered in the same orientation and middle isn't flipped. I'd check the voltage on power and ground of each connector that's flipped to see if they are actually soldered in reverse polarity. Orientation alone won't tell you that and there are no markings on the board to tell what the pins are going to.

It's odd that they are soldered different than the other connectors, but that doesn't mean that polarity is reversed. PCIe also supports reverse polarity and lane reversal. It would be dependent on circuit board design and you'd need to look at the back side. If polarity were truly inversed and circuit not designed to handle it, then it would fry immediately. Not clear if that's what happened. If he had them working for some time and then they fried, it most likely wasn't due to the breakout boards. I just got a couple x7's and will check them when I'm home, but pretty sure all the connectors are in same orientation.

I use WooCommerce on quite a few sites. It's developed well. Reducing stock when adding to cart would be an even worse scenario and would allow one person to wipe out or hold all the inventory. That's what the hold stock feature would allow. Thinking again, it's more likely they aren't using it and stock is reduced only after payment as that would allow you to add an item to the cart while it's still in stock, but then be out of stock if it's the last one and someone else pays before you. They are probably manually clearing unpaid orders after x minutes or have a custom function that does it. By default, stock is reduced when an order changes to "Processing" status.

This issue was rejected years ago:
https://github.com/woocommerce/woocommerce/issues/5966

The ordering process is really no different than sneakerheads and bots trying to order limited shoes that sell out instantly. You just have to be quicker.

My payments were confirmed quickly. Make sure you send BTC with large enough tx fee to confirm within first 2-4 blocks. They usually reply within 3-5 days.