hashcat-nvidia-power-performance-per-watt-adjustment.txt

hashcat-nvidia-power-performance-per-watt-adjustment.txt

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You can drop the power on NVIDIA cards and improve performance per watt.

Credit for the idea to atom on the 1080s:

https://docs.google.com/spreadsheets/d/1B1S_t1Z0KsqByH3pNkYUM-RCFMu860nlfSsYEqOoqco/edit#gid=1307275979

On the GTX 970s, you can drop to 150 and still get 99.96% of the same 
performance! This saves power (and heat?). And there is evidence that the
performance difference varies per hash and per attack (masks, rules, etc.)

Minimum power on 970 is 100. For sha1+mask, performance % compared to default power:

W       MH/s    MH/s/W          diff
100	3155.3	31.553  	86.52243062%
120	3447.2	28.7266666667	94.52670835%
150	3645.2	24.3013333333	99.95612592%
170	3646.8	21.4517647059	100%
187	3642.8	19.4802139037	99.8903148%

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My system:

* Device #1: GeForce GTX 1080, 2036/8145 MB allocatable, 20MCU
* Device #2: GeForce GTX 1080, 2028/8114 MB allocatable, 20MCU
* Device #3: GeForce GTX 970, 1017/4068 MB allocatable, 13MCU
* Device #4: GeForce GTX 970, 1017/4068 MB allocatable, 13MCU
* Device #5: GeForce GTX 970, 1017/4068 MB allocatable, 13MCU
* Device #6: GeForce GTX 970, 1017/4068 MB allocatable, 13MCU

# Note that nvidia-smi starts numbering of GPUs at 0.

$ for device in 0 1 2 3 4 5; do sudo nvidia-smi -i $device -pl 150; done
Power limit for GPU 0000:01:00.0 was set to 150.00 W from 180.00 W.
All done.
Power limit for GPU 0000:02:00.0 was set to 150.00 W from 180.00 W.
All done.
Power limit for GPU 0000:05:00.0 was set to 150.00 W from 170.00 W.
All done.
Power limit for GPU 0000:06:00.0 was set to 150.00 W from 170.00 W.
All done.
Power limit for GPU 0000:09:00.0 was set to 150.00 W from 170.00 W.
All done.
Power limit for GPU 0000:0A:00.0 was set to 150.00 W from 170.00 W.
All done.

At full load:

$ nvidia-smi -a | egrep '^GPU|  Power Limit|Default Power Limit|Power Draw'
GPU 0000:01:00.0
        Power Draw                  : 150.30 W
        Power Limit                 : 150.00 W
        Default Power Limit         : 180.00 W
GPU 0000:02:00.0
        Power Draw                  : 148.24 W
        Power Limit                 : 150.00 W
        Default Power Limit         : 180.00 W
GPU 0000:05:00.0
        Power Draw                  : 137.72 W
        Power Limit                 : 150.00 W
        Default Power Limit         : 170.00 W
GPU 0000:06:00.0
        Power Draw                  : 144.92 W
        Power Limit                 : 150.00 W
        Default Power Limit         : 170.00 W
GPU 0000:09:00.0
        Power Draw                  : 148.29 W
        Power Limit                 : 150.00 W
        Default Power Limit         : 170.00 W
GPU 0000:0A:00.0
        Power Draw                  : 145.53 W
        Power Limit                 : 150.00 W
        Default Power Limit         : 170.00 W
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