Sent me a used antminer S1. Manufacturer date was 1/14. Order date was 3/14. Fan and heat fins were dirty and covered with dust. The antminer had been used from the time of production to the sale date. The heat fins were also physically damaged. Both blades were not soldered properly and were separating from the base. I have included pics so you can see for yourself. I contacted Juan from 112bit and he was not helpful at all. He told me i am not the manufacturer contact bitmain. He no longer responds to my emails. If you have any problems he will brush you off and say im just a distributor i cant help you contact the manufacturer. Do not buy from 112bit or bitmain. 112bit is just a middle man and can't do anything but take your money. Bitmain is a chinese manufacturer. They have low standards for quality. They will not accept any responsibility for anything. All of the financial burden is on the buyer. They do not care about their customers. All they care about is mass production and sales. This has been an ongoing issue. I have returned the antimner and requested a refund due to the amount of mining time lost waiting for a replacement. I was told i pay return shipping and they will give me a refund when delivered. After the antminer arrived in china i was told they will not give me a full refund. I am responsible for the original shipping cost, return shipping cost, and import tax both ways. I have not been told how much of a refund i will receive but it will be around $200 less than what i paid. And to be perfectly honest, i have a feeling bitmain will come up with some BS excuse such as it was not returned in the original condition and they can not give me a refund or replacement. May god help you if you buy a S2 from them. They have jerked me and given me such a hard time over a S1 i can only imagine the nightmare you will have to go through to get any kind of support for the much more expensive S2.

One running for 24 hours solid so far.

Still waiting to hear positive confirmation from the Bitmain engineer/s regarding 2x 700-750w PSUs.

He did - on batch 3....

and apparently the problems im having are down to my network.

the same network thats perfectly fine for 6 S1s, 2 avalons, and 2 jupiters...


@hurricane dave, these Enermax Revolution 87+ PSUs dont even have a fuse in the plug...

I think its the PSU, when removing all the boards and connections so only the PSU is connected the PSU won't power on either.. have to wait for at least 10 minutes to get it working again.
Damn I wished they kept with the platimax instead of the gold revision of enermax.

My S2 was running fine overnight since last evening. Suddenly stopped hashing (based on pool stats).
Will have to investigate when I come back from work.

Anyone else had a similar experience?

Anyone have any luck with overclocking? I've been running 5 s2's at 225MHZ (EVGA 1300W PSUs) for 24HRs. Here's the 12HR average for 5 machines which, at the console, report 1150GH/s each.

Lol, WTF?!  This is the BitMain S2 thread.  Where else are we supposed to talk about this?

care to expand on this matter? is GAW good or bad? i see they even have a discount going on for S2, are they assumably in-stock?

What the f.....

care to expand on this matter? is GAW good or bad? i see they even have a discount going on for S2, are they assumably in-stock?

thanks that is exactly the info i was looking for

This thread is getting really difficult to follow...  What is going on and on about Bitmain shipping a little late going to fix?  Your box got shipped late, you're really mad, you think Bitmain is really crooked, the world is coming to an end because no other vendor on the planet ever ships late.... We got it!  Bitmain isn't Amazon (about the only company I deal with who always seems to meet their ship/delivery dates, almost) and it sucks you lost a couple of days--maybe they'll hook you up with a coupon or something later.  MOVE ON!  What's done is done. We feel your pain, we get your frustration but OMG INBD!!! :-) Maybe we can start a totally separate thread for shipping frustration regarding the S2?

On a more important note, has anyone accomplished any acceptable overclocking?  As in, better than 25-30GH/s over stock?  I'm currently getting right at 1TH/s and not much over, I think some are getting closer to 1060GH/s stock?  I think a steady 150-200GH/s would be necessary to justify an upgraded PSU.

I'm also curious on how Bitmain has handled the totally un-workable units?  Like the ones that arrived damaged beyond customer repair.  As of now 112bit (Juan G.) is working on getting an issue with mine resolved (potential PSU issue) and so far, Bitmain seems to want me to send mine in for troubleshooting and repair--they've suggested compensating me for the days of lost mining in BTC but I don't know how much.


I've read here that several have been able to mine without issue with no display.  Have you been able to access the WebUI at all?  I suggest removing all cards/blades and cleaning the connectors (one of mine had a bunch of thermal paste) really well and then reseating all of them.