Topic: BITMAIN Antminer S3 support and OverClocking thread - page 42. (Read 158144 times)

Weird thing is, the OC'ed one is doing the best. Obviously shares accepted, but hw errors are lowest,  and discarded are the lowest as well.

The temps on all machines are right at 40c

http://imgur.com/01NWkWj

Two cables @ 225, but my cables are hot. 600b bronze power supply, if that makes different.

 I can hold the cables in my hand, but i'm not going to push them further.

Best I'm getting is ~2 gh/s per frequency, i.e., 225 = 450 gh/s

What's the highest frequency I can test without connecting 4 PCIE?  Right now I have 218.75 default frequency .

Thanks

Technically, the 2nd procedure you mentioned is correct.  Applying it w/ plastic or razor has the potential to create micro air bubbles in the paste and hinder its ability to transfer heat away from the chip.

I would test a small amount on one chip, and see what the coverage is like.

Once you have roughly the ideal amount, simply repeat the process down the line...

A little dab will usually suffice...

When you guys are re-applying thermal paste after cleaning with alchohol are you applying a thin layer with a piece of plastic/razor so the entire chip is covered or do you just put like a 1/2 pea sized drop in the center of each chip and let the heatsink smoosh it around?

I had a unit that would X chips at any clock about 218.75. Had to take it apart and reapply thermal paste. No X chips after that. Been running for 2 days on stock clock with no issues.

of 4 units:

a) 231.25MHZ = 452Gh
b) 218.75MHz = 429GH (one chip is shown as -  though, so presumably im losing about 12GH)
c) 250MHz = 502.5GH
d) 218.75MHz = 428GH (one chip is shown as -  though, so presumably im losing about 12GH)

ive tried rebooting the two systems with the dudding chips but to no avail. has anyone had and resolved this issue? (with the S1 a reboot always seemed to solve it)

overall im not terribly impressed with the quality of the components bitmain used. hopefully its a batch-specific problem though and wont occur again.

So in the apology post that Bitmain posted, ( https://bitcointalksearch.org/topic/m.7832797 ) they effectively indicated a bad batch of DC-DC and people weren't going to get the speeds they wanted.. hence the refund/credit.

I suspect they've set all S3's to 218 out of the box, and knowing that most of them won't be able to run over that point. I have (1) of (10) that can run over the stock.. the rest just start X'ing out ASIC's and never go any better.. they're actually faster are 218 than at 225/237/250/etc.

(I know a couple of -really- good board-level guys who could swap-out DC-DC supplies if I had any idea what to replace the faulty ones with)

I was a bit curious myself and tested one of my batch one units, but I'm getting different power numbers at the wall. See below:

218 mhz -- 440 GH --  360 watt at the wall
225 mhz -- 387 GH --  348 watt at the wall
237 mhz -- 408 GH --  360 watt at the wall
250 mgh -- 424 GH --  345 watt at the wall

I'm using a Corsair HX650 for each unit and testing using a Rosewill RHSP-13001. I've only tested one S3 thus far but there appears to be a power issue, or it's just not liking anything outside of stock frequency. I haven't flashed the firmware yet but am more concerned that I'm not pushing the same power to the unit at those higher frequencies. Any thoughts?

Quick power #'s, measured with my best unit.. and the only one that will hit 500GH.

Corsair TX850 80plus bronze PSU - single S3:
218 mhz -- 450 GH --  346 watt at the wall
225 mhz -- 480 GH --  370 watt at the wall
237 mhz -- 500 GH --  394 watt at the wall

...package 'cgminer'

config 'asic-freq' 'default'

        #option 'freq_value'    '1486'  #262.5M
        #option 'chip_freq'     '262.5'
        #option 'timeout'       '15'

        #option 'freq_value'    '1386'  #250M
        #option 'chip_freq'     '250'
        #option 'timeout'       '16'

        #option 'freq_value'    '1306'  #243.75M
        #option 'chip_freq'     '243.75'
        #option 'timeout'       '17'

        #option 'freq_value'    '1286'  #237.5M
        #option 'chip_freq'     '237.5'
        #option 'timeout'       '17'

        #option 'freq_value'    '1206'  #231.25M   
        #option 'chip_freq'     '231.5'             
        #option 'timeout'       '18'                                                         
                                                                     
        #option 'freq_value'    '1185'  #225M   
        #option 'chip_freq'     '225'           
        #option 'timeout'       '18'           
                                               
        option 'freq_value'    '1106'  #218.75M
        option 'chip_freq'     '218.75'       
        option 'timeout'       '18'           
                                               
        #option 'freq_value'    '1086'  #212.5M
        #option 'chip_freq'     '212.5'       
        #option 'timeout'       '18'         
                                             
        #option 'freq_value'    '0782'  #200M
        #option 'chip_freq'     '200'       
        #option 'timeout'       '20'