Topic: ANTMINER S7 is available at bitmaintech.com with 4.86TH/s, 0.25J/GH - page 250. (Read 528055 times)

OK, another stupid question from someone who is getting his S7 delivered tomorrow.  Since I will be using separate power supplies for the hash boards, is there any concern about overheating while turning them on one at a time with the control board psu being the last one to turn on?

I'm just curious since the worry about 'internet connection' issues and fans not cooling, when they're initially powered up is that any concern?

I just received a shipping notice from BITMAIN for delivery for an order from 10/18.      I still have more orders on 10/24 and 10/25. I do believe they are catching up!!!

I bought a S5 from a guy that ran only 1 of 2 connectors for each of the hashboards and claimed that it ran perfectly.  The reason I know this is that this S5 would not hash at top performance....maybe because of the lack of voltage throughout the hashboard correctly.  I would not recommend this practice at all to anyone.  There needs to be an equal dispersion of current throughout the hasboards.

The the heat sink issue, with them detaching and moving ... I wonder if a couple of pieces of good ol electrically insulating "fish paper" slipped between the boards would help keep them from shorting out the neighboring board and tighten up the space so they don't move around as much if they do come loose.

The fish paper cross section would be parallel to the air flow so any restriction from the fish paper would be very minimal.

I don't have my S7's yet so I can only speculate from looking at the pictures.

Ummm, I don't think these are UL listed/approved .... ;-P

Looks like I'll be building a current monitoring system with an emergency shutdown on the power system as well as piggybacking a couple fans that are ALWAYS on. A sensitive smoke detector and A CO2 or Halon fire suppression system probably would be a good idea also ...

Oh, and make sure your home owner insurance is in good standing ... lol...

I think it's unlikely anybody will publicly state that you can get by with two connections. Anecdotal information suggests that two will allow proper operation most of the time. All three are required to preserve warranty. If you only do two and one of them discolors or melts, then you'll probably be screwed as to warranty.

Also remember that with only two, they need to be high quality cables and connectors. Downclocking is also an option.

As usual, do it at your own risk.

If you lower the freq you could most likely get away with less PCI's plugged in. (Just not sure how low you would need to go)

I don't think anyone would want to risk trying that since we're talking about a $1600 piece of hardware.

Question for S7 -
Bitmain says all three PCIe connectors on each board must be attached.  Does anyone know if miner will work with one open on a board?  In other words is this a hard and fast rule or is this for ideal performance?

It's been a while since I've owned a Bitmain product. I forgot how nice and detailed the stats are.

I've been trying to tune my rigs for optimal performance. With my S3s I used a technique of computing the accepted difficulty per second over a reasonably long time (like a day). Then I'd tweak until there was no more improvement. The idea is that while the other local stats are interesting, the accepted shares is most important.

However I'm finding that this is not working with my current S7 and pool set up. Even for the same settings on the same S7 I'm seeing fluctuations of a 1 or 2 percent in the accepted difficulty rate over a day or so span.

Maybe it's the pool being inconsistent? The rigs have mostly been pointed at F2Pool.

Or is it that the local difficulty is set so high (16.4k) that I'm actually seeing local variance? That seems unlikely.

I guess that if the accepted difficulty rate is not a reasonable way for me to measure tweak results, I have to fall back to raw local hashrate and hardware error rate. If so, what HW error percentage rate are you guys trying to target?

Alternatively if this is pool related, I can switch pools. Currently I've been trying the trick of nicehash as the first pool with a high profitability value, and F2Pool as second. This results with mostly mining on F2Pool and occasionally redirecting at nicehash when it's high enough (like it was yesterday for an hour or so).

Maybe I'll go back to slush. I've mined there a lot since they went beta with their new interface. I only left because I wasn't convinced that they had solved their recent orphan blocks problem (which was related to their pool implementation and the malleability attacks). Also, due to its scoring algorithm you really can't bounce between pools so the nicehash trick is out when mining at slush.

Thank you,

My apologies for the delay.  I've been sleeping.  I was up until 5:25am this morning.

I do my best.  I still have a lot to learn with mining, nodes, the blockchain, code, networking, etc...  There are a lot of fine gentlemen and ladies on here with loads of experience and knowledge to learn from.  I feel privileged to be in the company of most all of them on here.

Have a good day, AriesIV10.

David

Thanks for clearing it up.  The confusion came when you said you were using 32,000 Watts of rigs and everything else in the house worked fine without tripping the breaker.  The very fact you have the AC disconnected will have everything else work fine with the rigs running.  The AC is the biggest burner of power after the rigs.

LOL,  I never said I don't ever cook or that I take cold showers - to the contrary I just made some spinach egg scramble as well as some sausages for breakfast (While heating my coffee in Microwave) and am about to take a nice HOT shower.
Clothes, yes - I said I don't use dryer - I air dry them.  A/C - I simply don't use either.  In fact it's disconnected from the main and have 4 x 20 amp 120 circuits installed in its place for miners.  The Fridge operates on a 120v circuit.  I do next to zero gaming.  My son does the gaming, but I do have a dual xeon rendering rig that gets kicked on from time to time that draws 1000 watts when rendering, or mining.

Did you configure your pool information on the miner? As it will mine but to Bitmain account. If you did I think I would check the miner status page and watch your temps see what they are. Then if that looks good I would try and use a volt meter and check your voltage from the PSU under load. Watch it the whole 3-4 mins and see if the voltage drops off as the miner drops off.

I would like to see a screen shot of the miners status page.

RM or HX are both pretty high quality PSU's as far as Corsair's models.   I like the RM series just as I have used so many RM1000's but that is personal preference.

After looking at PSU's lately I think I would look into server PSU's.  A lot of them really are quite a bit cheaper.  It's honestly kinda nice after getting use to using them.

ah, ok I misunderstood.  So I'll just stick with my plan of 3 HX850's for my S7, and have to deal with buying another psu if I manage to snag another S7.

Correct, that would be for two boards.
Here are corsair rm1000 used I just googled. $115 shipped. Half of mine are used.
https://www.sierracomponent.com/product/components-peripherals/power-supplies/cp-9020062-na-corsair-rm-1000-watt-power-supply-801940120595-used/

But an AX1200 can't power a single S7 since they use 1210W.

80% is max I would do for safety. 60% is safer.
I'm running 3 corsair rm1000 watt psu's to power two s7's, that is at 80% for two boards on s7. At 80% it keeps the fan running slowly to cool.
When you drop $2000 on a rig, don't skimp on psu.
Even a corsair AX1200 is good. Good price on ebay.

In theory. The initial RM750's and RM850's were a bit notorious for running into thermal issues and potentially causing all sorts of havok. I believe Corsair has since replaced the inferior components they were using in the RM series.