Topic: Antminer S2 Support and Overclocking Thread - page 6. (Read 26666 times)

I think the settings for 225 are already in that config file although when i tried to use it the HW error rate was extremely high so something could be off, I suspect those other settings are just left overs from the S1's config files

Hi ,

I have an additional 750W that i plunged in to to make 1750w. An for extra cooling iv just layed 4 fans on top of the boards .

How to go about overclocking even more .What is the algo for frequency value seems like random numbers and some have letters ?

The chip frequency seems self explanatory.

And then Their is the time out .Is this seconds ?

To go to the next level up from  219 would be complete guess work for me .


  #option 'freq_value'     '?'  #225M
    #option 'chip_freq'      '225'
    #option 'timeout'        '?'

Thanks ever so much look forward to the help

~Luke

I agree I had the 1350 PSU's laying around from some old Scypt GPU rigs so I didnt spend much. Also I see newegg has them onsale with a $40 mail in rebate http://www.newegg.com/Product/Product.aspx?Item=N82E16817194105
Only $259.99 after mail in rebate

I threw an EVGA 1300 in one of my S2s and have it running at 212 which shows 1077gh average in the interface, 1.1th average at the pool.  Power usage from the wall is about 1135w.  Will be setting it up to 219 next and see what the difference is.

If i can consistently get 100+gh out of each of my S2s by just throwing in a new power supply i say its worth it. 

Im curious how high we can get them on stock voltages.  Has anyone figured out any way to over volt and push the clocks higher?

Yes I had to change to 1300 Watt PSU even running 1 unit stock the other with modified PSU i noticed a reduction in HW Errors so I say a PSU upgrade is a must. When I get to work later I will post instructions on which files to modify and settings for 200Mhz Clock. I am putting together a chart of Clock Speeds with GH gain and Watt increase so far I am up to 1.1TH Average for 71 Watt increase from Stock. Just FYI the 200MHZ clock is already loaded in there but modifying the file is a little different then on the S1's I will post some screen grabs and step by steps on this soon

Ok so how did you access those files once you logged in?  I can't seem to access anything.  The same lines from the S1 do not get you to the dance so to speak. 

You forgot to post freq value and timeout for 200.
I have a spare EVGA 1300 and wonder if I can mildly overclock (only if it will be stable).

OK so how did you changed speed to 200? What is posible with stock PSU?

Since there is scattered info on the Antminer S2's I thought it would be a good idea to start a thread dedicated to the support and overclocking of the newer S2's

So Far I have replaced my PSU with a newer Enermax 1350Watt Platinum rated as I believed the stock PSU was pushed to close to the limit, this should add some additional head room to OC the boards

My first attempt to SSH into the unit has failed look like the SSH password is not the same as the web interface does anyone know this? SOLVED

WEB LOGIN root
WEB PASSWORD root

SSH LOGIN root
SSH PASSWORD admin

OVERCLOCKING STEPS *PLEASE NOTE THIS IS DONE AT YOUR OWN RISK* IF THIS WORKS FOR YOU PLEASE DONATE FOR THE TIME I INVESTED IN THIS IF YOU FEEL IT WILL MAKE YOU MONEY

Step 1 Using Putty  or another program SSH into your Miner
Step 2 Click "YES" on the "Security Alert" that pops up
Step 3 Login with User: root Password: admin
Step 4 Type "cd /config"
Step 5 Type "vi asic-freq.config
Step 6 Hit the "I" key to edit the file
Step 7 Scroll the the bottom and copy this code and click in the SSH window to paste it (I suggest you start with the 212M Settings run it for a few hours make sure your miner is stable then work your way up)
    option 'freq_value'    '5082'  #212M
    option 'chip_freq'     '212.5'
    option 'timeout'       '36'

    #option 'freq_value'    '6206'  #216M
    #option 'chip_freq'     '215.625'
    #option 'timeout'       '37'

    #option 'freq_value'     '5102'  #219M
    #option 'chip_freq'      '218.75'
    #option 'timeout'        '38'

Step 8 be sure to add "#" in front of everything listed on the 196M line
Step 9 Hit "esc" then type ":wq"
Step 10 (IMPORTANT) type "cp asic-freq.config /etc/asic-freq.config"
IF YOU SKIP THIS STEP ALL SETTINGS WILL BE LOST WHEN YOU POWER CYCLE THE MINER
Step 11 Now Login to the web interface of your miner and go to the miner config tab and click "save and apply" this will restart cgminer with the new settings

Based on my testing here is how my miner performed at each speed

212mhz     1083GH     (+56 Watts)(+80GH Speed)(HW Error 0.22%)
216mhz     1098GH     (+71 Watts)(+95GH Speed)(HW Error 0.39%)
219mhz     1114GH     (+90 Watts)(+111GH Speed)(HW Error 0.88%)

Keep in mind your results might vary. Enjoy and happy mining