Estimate power consumption at v/freq combination

philipma1957

legendary

Activity: 4116

Merit: 7849

'The right to privacy matters'

Quote from: thierry4wd on December 07, 2019, 02:05:31 PM

interesting ... i have tested 950mv haha !!! run good ... but not serious run with this high voltage and not utility lol

So, is not good, S9 need OPENCORE higher than run voltage for good hash...

for exemple, i have tested opencord 910mv (for not over 1600W psu at startup) and run with 775mhz at 910mv , but not "full" hashing... but if i opencore at 940mv and run with same spec (910mv, 775mhz), no problem ! all hashboard is ok at full speed

Then it just becomes how do you cool the unit.

thierry4wd

sr. member

Activity: 446

Merit: 347

interesting ... i have tested 950mv haha !!! run good ... but not serious run with this high voltage and not utility lol

So, is not good, S9 need OPENCORE higher than run voltage for good hash...

for exemple, i have tested opencord 910mv (for not over 1600W psu at startup) and run with 775mhz at 910mv , but not "full" hashing... but if i opencore at 940mv and run with same spec (910mv, 775mhz), no problem ! all hashboard is ok at full speed

taserz

sr. member

Activity: 800

Merit: 293

Created AutoTune to saved the planet! ~USA

you can go higher than 9.4 but most no one bothered adding it to the code. It's just dumb they run like shit at 9.4 as it is haha. Although I should make a firework firmware to kill old s9's haha

philipma1957

legendary

Activity: 4116

Merit: 7849

'The right to privacy matters'

Quote from: Blahblah913601 on November 17, 2019, 05:04:12 PM

Is there some formula to estimate power consumption from V/Freq combination? E.g so (14 th/s version) claims 1375w @650mhz. What would W be if I go to 660mhz or different V? I understand I can just o and try but I was thinking there might be some functional relationship.

higher frequency is more power 💥 hungry most likely if you s9 is allowing you volts and freq you need to raise volts higher as you lift the freq.

it varies unit to unit based entirely on the chips in your unit.

i have one unit with braiins software which allows freq and volts for each of the three boards.

i could do

8.1
8.1
8.2

and set a low frequency getting 10th and 815-825 watts.

it was my best underclock unit.

i can not really give you a formula that would be accurate since yiur chips on your boards can vary a lot. 5-10%.

i can tell you higher frequency will need more volts. then 8.1 or 8.2

7.9 is lowest
9.4 is highest IIRC.

Blahblah913601

newbie

Activity: 1

Merit: 0

Is there some formula to estimate power consumption from V/Freq combination? E.g so (14 th/s version) claims 1375w @650mhz. What would W be if I go to 660mhz or different V? I understand I can just o and try but I was thinking there might be some functional relationship.

Topic: Estimate power consumption at v/freq combination (Read 164 times)