I just updated my PC/rig to ubuntu 20.04 and driver (390, 435 and 440 tested) from ubuntu repo if i set lower power limit clock drop from 50-70% (depending on cuda miner use)…
clock drop under 16.04 was from 10-30% but here power use is huge and performance drop way more
power limit of 160w drop clock to ~500-600Mhz while mining and in ubuntu 16.04 clock drop only to ~1300Mhz
tried updating kernel, setting performance mode all the same, same rigs on gtx 1070 works fine and appz is hashing ~14Mhs at 110W and Gtx 1080ti 160W is doing 11Mhs
| NVIDIA-SMI 440.64 Driver Version: 440.64 CUDA Version: 10.2 |
|-------------------------------±---------------------±---------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 GeForce GTX 108… On | 00000000:01:00.0 On | N/A |
| 80% 61C P2 163W / 160W | 2654MiB / 11178MiB | 100% Default |
±------------------------------±---------------------±---------------------+
| 1 GeForce GTX 108… On | 00000000:02:00.0 On | N/A |
| 80% 60C P2 163W / 160W | 2580MiB / 11178MiB | 100% Default |
±------------------------------±---------------------±---------------------+
| 2 GeForce GTX 108… On | 00000000:03:00.0 On | N/A |
| 80% 56C P2 102W / 160W | 2580MiB / 11178MiB | 100% Default |
±------------------------------±---------------------±---------------------+
| 3 GeForce GTX 108… On | 00000000:05:00.0 On | N/A |
| 80% 58C P2 163W / 160W | 2580MiB / 11178MiB | 100% Default |
±------------------------------±---------------------±---------------------+
±----------------------------------------------------------------------------+
| Processes: GPU Memory |
| GPU PID Type Process name Usage |
|=============================================================================|
| 0 2389 G /usr/lib/xorg/Xorg 18MiB |
| 0 2492 G /usr/bin/gnome-shell 69MiB |
| 0 3480 C ./nbminer 2553MiB |
| 1 2389 G /usr/lib/xorg/Xorg 14MiB |
| 1 3480 C ./nbminer 2553MiB |
| 2 2389 G /usr/lib/xorg/Xorg 14MiB |
| 2 3480 C ./nbminer 2553MiB |
| 3 2389 G /usr/lib/xorg/Xorg 14MiB |
| 3 3480 C ./nbminer 2553MiB |
±----------------------------------------------------------------------------+
ru7@ru7-System-Product-Name:~$ nvidia-smi -i 0,1,2,3,4 --format=csv --query-gpu=clocks.mem,clocks.gr
clocks.current.memory [MHz], clocks.current.graphics [MHz]
5514 MHz, 658 MHz
5514 MHz, 658 MHz
5400 MHz, 544 MHz
5514 MHz, 683 MHz