S7 - please help me understand...

[ldrapeau]

Hi,

Received my S7 batch 4 (4.66 TH/s), I decided to match it with 3xThermaltake SP−650PCBUS @ 80.00 CAD each, I'm in computers and the plan is to reuse these eventually in systems I build or for repair.  Now, had quite a deception when I started the miner, was doing only about 1 TH/s.  Checked the voltages and had about 11.5 or so.  

So I decided to play with the frequency only going slower not higher, I thought I found the sweet spot at 520.83 where I was getting about 3.05 TH/s with voltages of 11.22 11.23 and 11.29.   I setup some  logging in a database to follow this, after a couple of days I noticed my average was slowly going down, is my miner going to die?   I'm a bit scared but decided to lower even more and now it's doing even better at 508.33 with the same voltages, can I hurt my little buddy with this?  

Thanks, Louis

Updated stats

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[Amph]

lowering the frequency should not cause any harm, what will damage it is the overvoltage or the over frequency without a proper cooling system

i find strange that they are not set optimally by default, and you need to tweak them like this

[philipma1957]

your voltages are not high enough why are they so low?  did you set them low? 


get a real set of psu's if your psu's sag down from 12 volts to 11.2 they are no good for this gear.

[ldrapeau]

No, I have no control over what the Thermaltake power supply outputs, I was just deceived that it did not give 12V.  I will be trying it with bitmain's power supply, I expect to get the promised performance with that.

[jonnybravo0311]

Hopefully you've got at least a 208V plug for the Bitmain PSU - it won't even fire up on standard US 110/120V plugs.  I don't know where you're located, but thought I'd point that out for you.  A single EVGA 1300G2 will drive that S7 - but you need to get a couple cable splitters so you can have enough PCI connections.

[ldrapeau]

Hopefully you've got at least a 208V plug for the Bitmain PSU - it won't even fire up on standard US 110/120V plugs.  I don't know where you're located, but thought I'd point that out for you.  A single EVGA 1300G2 will drive that S7 - but you need to get a couple cable splitters so you can have enough PCI connections.

Hi,

Thanks for the info, I'm all ready on 240V circuit so it should be fine.   I'm located in Montreal, Qubec, Canada.  I have ordered 4 units, most likely will use two (plan on buying an another S7 soon for a freind and maybe an extra one for me).

[jonnybravo0311]

Glad you've got some 240V circuits available to you... those Bitmain PSUs will work just fine, then.  You're buying a friend an S7?  Need another friend?

[blockchainmines]

Hi,

Received my S7 batch 4 (4.66 TH/s), I decided to match it with 3xThermaltake SP−650PCBUS @ 80.00 CAD each, I'm in computers and the plan is to reuse these eventually in systems I build or for repair.  Now, had quite a deception when I started the miner, was doing only about 1 TH/s.  Checked the voltages and had about 11.5 or so.  

So I decided to play with the frequency only going slower not higher, I thought I found the sweet spot at 520.83 where I was getting about 3.05 TH/s with voltages of 11.22 11.23 and 11.29.   I setup some  logging in a database to follow this, after a couple of days I noticed my average was slowly going down, is my miner going to die?   I'm a bit scared but decided to lower even more and now it's doing even better at 508.33 with the same voltages, can I hurt my little buddy with this?  

Thanks, Louis

Updated stats

Just so I understand, you are using 3 650 Watt power supplies for 1 S7?  I want to save further comments until I understand exactly what your setup is.  However I did get the 11.2 volts you mentioned and yes that is not going to be enough to initiate or boot the chips on the hash boards.  These miners are very finicky about the power.  Even it you were able to get it to come up you would run a lot of errors.  I am surprised by this because thermal take is not a bad product.  It is not my top pick, but I have run one before in my computer with no problems.  For the money you spent you would have been better off buying a couple corsair or evga units and again I am assuming you are talking about powering just 1 S7.  Let me know if I have my facts straight.     

[ldrapeau]

Hi,

You are right it was 3 650 Watt PS's for only one S7, but you are wrong on the fact that the machine would not work.  It's works fine and would give me an avergae of 3.848 TH based on a sample of a bit more than 5 days, however for this to happen I had to lower the freq to 579.17 the HW error rate was 0.01% and it was pulling ~ 850 Watts at the wall on 240V AC.   I bought the PS from bitmain and I am now getting 4.654 TH based on a 12 day sample (each 15 minutes)  with a 0.0002% HW error rate, the three boards are respectively at 46, 47, and 49 degrees Celsius and the two fans at 3720 RPM each.   The one only real amazing bizarre thing I have noticed is that when I take a voltage reading with my voltmeter it sometimes "bug's" the machine were it consumes much more power and basically gives no TH's, very weird, simple reboot solves the case.   My theory (with help of my cousin who is electronician) is that the test leads of the (cheap) voltmeter act as an antenna and transmits noise/interference to the controller board causing a dysfunction.