Topic: Bitmain S4 Hacking, Mods, Underclocking, Undervolting (Read 730 times)
Very nice results, thanks!
Best undervolt using oct 2014 firmware is :
Freq : 100
Volt : 0670
For 1008gh @ 640w saving approx 100w
Can anyone do better than this??
U can use Volt 0670 across any Freq setting for a marginal power saving,i found any volt setting lower than this either made the miner run at a worse w per gh than it already did or the miner just wouldn't start.
Anyone else replicate these results or better them??
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UPDATE
If u can get the J7 board to set the voltages correct on startup (This requires a kill o watt or similar)
To do this u'll need to start & restart the machine till the kill o watt tells u the right voltage / watts...
The amount of restarts is random so just keep trying it till it sets right.
Old settings as above with J7 on the loose will give 640w
With the J7 running correctly it will be 600w, That's another 40w saving....
Freq : 100
Volt : 0670
For 1008gh @ 640w saving approx 100w
Can anyone do better than this??
U can use Volt 0670 across any Freq setting for a marginal power saving,i found any volt setting lower than this either made the miner run at a worse w per gh than it already did or the miner just wouldn't start.
Anyone else replicate these results or better them??
-----------------------------------------------------------------
UPDATE
If u can get the J7 board to set the voltages correct on startup (This requires a kill o watt or similar)
To do this u'll need to start & restart the machine till the kill o watt tells u the right voltage / watts...
The amount of restarts is random so just keep trying it till it sets right.
Old settings as above with J7 on the loose will give 640w
With the J7 running correctly it will be 600w, That's another 40w saving....
Show us what u got??
Trying to find a good list of all if any mods for the S4 that are out there??
No one seems to have done this??
Ill put one in for those who didn't know...
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Undervolting or Overvolting is only available with the October 16th firmware
The best underclock or undervolt i have seen out there is
Freq 175mhz
Volt 0700
For 1085w from the wall & hashing at 1754gh...
Another is
Freq 162.5
Volt 0670
For 1500gh at 1000watts
Another is
Freq 175
Volt 0680
Unsure of watts hashing at unknown gh
Another is
Freq 187.5
Volt 0720
Gives 1800gh at unknown watts
Another is
Freq 187
Volt 0700
Gives unknown gh at unknown watts
I will try these myself with a kill o watt shortly
-------------------------------------------------------------------------------------
Overclock
Freq 218.45
Volt 0745
For 2200gh @ unknown watts at the wall
Another
Freq 212.5
Volt 0740 or 0745 ur choice for stability
Gets 2150gh @ unknown watts at the wall.
WARNING WARNING WARNING
I would not suggest any overclocking using a stock bitmain PSU
IBM DPS-2000bb @ 2000watts will give u a clean punch of power to suit overclocking
Anyone else care to share??
Trying to find a good list of all if any mods for the S4 that are out there??
No one seems to have done this??
Ill put one in for those who didn't know...
----------------------------------------------------------------------
Undervolting or Overvolting is only available with the October 16th firmware
The best underclock or undervolt i have seen out there is
Freq 175mhz
Volt 0700
For 1085w from the wall & hashing at 1754gh...
Another is
Freq 162.5
Volt 0670
For 1500gh at 1000watts
Another is
Freq 175
Volt 0680
Unsure of watts hashing at unknown gh
Another is
Freq 187.5
Volt 0720
Gives 1800gh at unknown watts
Another is
Freq 187
Volt 0700
Gives unknown gh at unknown watts
I will try these myself with a kill o watt shortly
-------------------------------------------------------------------------------------
Overclock
Freq 218.45
Volt 0745
For 2200gh @ unknown watts at the wall
Another
Freq 212.5
Volt 0740 or 0745 ur choice for stability
Gets 2150gh @ unknown watts at the wall.
WARNING WARNING WARNING
I would not suggest any overclocking using a stock bitmain PSU
IBM DPS-2000bb @ 2000watts will give u a clean punch of power to suit overclocking
Anyone else care to share??
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