Bitmain will be releasing S15 and T15 on 8/11/2018

[kodokbuduk]

Dang, I knew I should had wait a bit.

I paid 1.2k USD for the S15 (27Ths  Jan. 11-->)
and now they dropped the same batch price to 1k USD.

Fuck.

Price went back to 1.2k USD

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[VRobb]

Yeah, we know...  

And it looks like they changed the S15 price back to 1.2k USD.  

No coupon was sent to me.

[mgoz]

Seems they are selling 27 TH/s and 28 TH/s batches at different prices now. My scoring hashrate has been averaging 28-30 TH/s on Slush and sometimes spikes at 32 TH/s. No problems since turning it on.

[ConnerM]

What input voltage are you guys running these at? The 8 S15 28Th units we've been running on our rack @ 208v since Monday are all functioning perfectly. Two units that arrived yesterday that we setup at a different location on 240v ran fine initially but both failed within 12 hours. PSU dead, no power. The card included with the units shows a rated voltage range of 200-240v.

[Pizzi_h]

Anyone gotten to Overclock these babies?

got an S15 28th

firmwire 3dec 2018

seems i cannot do anything with it.

Ssh doesent work neather, thats why im wondering if anyone gotten to OC these ones or gotten any more info out of them

[sarcheer]

What input voltage are you guys running these at? The 8 S15 28Th units we've been running on our rack @ 208v since Monday are all functioning perfectly. Two units that arrived yesterday that we setup at a different location on 240v ran fine initially but both failed within 12 hours. PSU dead, no power. The card included with the units shows a rated voltage range of 200-240v.

I’m running my T15 at 200v since Tuesday without issue. How long have you waited between trying to get it running again? The APW5’s I have, when they trip into protection mode, can take 15 minutes of being unplugged before they’ll respond to power input again. I wonder, what are the stats on the APW8?

[ConnerM]

I’m running my T15 at 200v since Tuesday without issue. How long have you waited between trying to get it running again? The APW5’s I have, when they trip into protection mode, can take 15 minutes of being unplugged before they’ll respond to power input again. I wonder, what are the stats on the APW8?

I was thinking that too. Did try to re-power the units a couple times over the course of a few hours, but no luck. One unit was in my basement, about 60 degrees ambient and only ran for about 45 minutes. The psu on that unit was quite hot to the touch just after it lost power. The other unit was in my garage, about 35 degrees ambient. That unit ran for 11 hours before it lost power, again, the PSU was quite hot to the touch. I put a meter on both the outlets and they tested 240v. I will take both S15's back into the office Monday and put them on the rack at 208v and see if they power back up, or if something inside the PSU is actually blown. I would like to open them up and do some power troubleshooting but I don't want to void the warranty in case they need to go back. Bitmain doesn't seem to be offering any spare parts for these yet. I don't know if my experience is typical but I wanted to throw out a word of caution if anyone else is operating these at the high end of their voltage rating.

[philipma1957]

did you choose full speed or low speed?

seems to me you choose full speed.

I wonder if 240 volts and low speed is safe
and 240 volts and high speed is not safe

also  does your 240 volt setup run  hot say 243 volts to 245 volts.

My home  can be 238 to 246 volts.

It could be  you drifted past 240 to 243-246 and on high speed they power down.

I wonder if they would have been fine on low speed.

So this now brings us to 5 issues for the s15's in this thread.

As of today  I think no one has said the m10 has had a fail.

I mention this  because  the t15  s15 m10 are the three best units for mining as of now.

It will be interesting to see if the t15 and s15 get better

the s9 got better.

it will be interesting to see if the m10  stays trouble free.

[sarcheer]

Do the fans on the PSU spin when you try to re-power it up? More wondering if it is giving any indications that it is responding to input power.

The PSU on my T15 is not hot to the touch in normal mode in a ~75ºF room. I will check and confirm come Monday that this is still the case.

[philipma1957]

So on your power meters you read 200 ?

I am asking since you could drop under 200 if you normally read 200.

The gear says 200-240.   So if 243 kills them. What would 195 do?

My guess is a shut down.
My next guess is   Low setting will be fine for s15 or t15.  At 190 to 250.

But. High speed you will need to be say 201 to 238.

I would ask for those with the gear to read volts suppiled and speed you run at.
Maybe we can get an idea if this is true.

I had asked blokforge to sell me one via cc.  He missed my pm and when he contacted me I had purchased 8 k in other gear.  So I will be needing to mine longer before I get one of these. As I will no longer purchase direct from bitmain due to trump tax.

I may get an s15 from a private sale in feb. Till then I won’t be testing or showing them.

It is important to see if the psu really needs to stay inside 200-240 to run high speed safely .

So those that have them please give us info.

[HagssFIN]

I have ordered one S15 from Bitmain and I will do a review when I receive it.

[philipma1957]

I have ordered one S15 from Bitmain and I will do a review when I receive it.

Please  let us know

high speed hash
low speed  hash
high speed watts
low speed watts
high speed volts in
low speed volts in

all temps of all boards on all settings

TIA

phil

[sarcheer]

Multimeter tells me my PDU is distributing 200v regardless of load, my panel is labeled 208v however. I haven’t had power problems (no dead psu’s) in the year I’ve had this panel under 24/7 load. Temps ranged from 65 to 95 over that time as ventilation and A/C changed.

I’ve only run my T15 in LPM for 3-4 hours since I received it on Tuesday and I’ve had no PSU problems. So, based on available info, we can preliminarily say that the APW8 tolerates the low end of its rating better than the high end. It will be interesting to see this range better defined as more units enter the field.

So my stats are 23.35 TH/s at 200v, 7.6 Amps

[ConnerM]

Do the fans on the PSU spin when you try to re-power it up? More wondering if it is giving any indications that it is responding to input power.

No, nothing. Units are totally dead. No Hash boards, fans, or lights on the controller. Re-power produces nothing. Leads me to believe that the PSU's failed due to the voltage. Really want to open one up and do some testing.

philipma1957 is probably right, the voltage from my 240 outlets here at the house probably varies by couple of volts up and down. When I test them I was reading 240.8v. Most appliances designed for 240v power have an outside operating range of 250v due to variance. Not these guys, apparently. Oh, was definitely running them full power mode. They were running about 28.4 when they were up. I should have switched the other unit to low power mode when the first one failed, but I wasn't thinking it was a voltage issue until they both failed.

[philipma1957]

Yeah this likely it a spike above 243 is common in my area.  Even 245 can happen.

I almost never drop below 237.

And of course my 120 is often 121 or 122 and I almost never drop to 118.

I am guessing full power at 243 volts + equals psu death

We will need more confirmation of this to be sure.

We need a spare psu or 2 to test top limits.

This could be a real issue to USA miners as many of us get 238 to 245 for our 240 lines.

My new buildout with buysolar will be 40kwatt constant 240 but it could flux to 245.  This means no s15 or t15 on the 240 lines.

Although this guys warehouse has.

208
240
480

So if we do some s15 we will do it on the 208 . If someone can get spare psus we can test at 245 and see if there is a burn out at low power setting on the miner.

[sarcheer]

If your voltage is too high I don’t think running at LPM would have made a difference, especially if these PSU’s are as sensitive as they are appearing to be. What’s strange is the previous APWs were advertised as having “overvoltage protection.” Where was that for your units? Really hope Bitmain didn’t scrimp on these PSU’s.

Link to info below in case you’re interested in removing your APW8 and giving it an inspection:

https://support.bitmain.com/hc/en-us/articles/360013898033-How-to-detach-APW8-PSU-from-DR5-S11-S15-T15

[philipma1957]

Well I have gone as 247 very rarely. So if 240+ is an issue on both low setting and high setting I can’t use these that easily.  Lots of USA buyers will be complaining since lots of us go from 237 to 245.

Maybe it was just bad luck.  Years back the s7ln would have issues.  And the s4 or s2 had psu issues.

This will need to be watched for carefully.

[mikeywith]

it's quite the opposite, high speed require more current therefore more resistance and less voltage.

the more "power" your miner "takes" the more drop in voltage you get

in more details.

assuming your voltage reading "unloaded" 240v.

if your miner needs more power , it asks for more current from the source (volt) , the more current that moves thought the wires, the more heat it generates, the more heat the more the resistance, the higher the resistance the less the volt.

so your miner needs 5 amps 240v might drop to only 239.
but if it needs 7 amps 240v might drop to 238.
if it needs only 1amp it might stay at 240.

all the above numbers are nothing even close to reality, but just an explanation, you could have your miner at full load and it may still fail to generate enough resistance that is capable of dropping  the voltage by anything measurable.

The gear says 200-240.   So if 243 kills them. What would 195 do?

low voltage can damage your PSU , the psu has an ideal rated power of Volts * Amps it needs to keep it at x value
if the voltage drops it will try to cover up by drawing more amps (current) , and as explained above this will cause more heat , most of the times more heat than what your PSU can handle and that = psu damage.

but usually those psu come with voltage protection, which indeed is not perfect, but i am pretty certain it can handle at small drops and spikes.

[philipma1957]

well so far one guy with 5 units

running 3 at 208 volt input  high speed = good to go

running 2 at 240.8 volt input high speed = dead psu's

not enough to say  gear is fucked up

but enough for all owners to watch units carefully  and make notes of the input voltage.

another guy  with 4 units all four at high speed.
2 run hot and shut down
2 run okay and don't shut down

It is new tech and bitmain has had new tech struggle during early batches.

fanatic26 usually has a lot of gear running.

maybe he can post  his s15 numbers  if he has them setup.

[Artemis3]

well so far one guy with 5 units

running 3 at 208 volt input  high speed = good to go

running 2 at 240.8 volt input high speed = dead psu's

I'm willing to guess their PSUs are optimal for chinese mains, which is 220v@50hz...