I've mobo ASRock H110 Pro BTC+ with 8x GPUs 1080Ti to today. Today I bougth next 3 GPUs, connect them, but detected next ONE card only. Hash power decreace too. With 8 gpus I had about 6400 Sol/s, now have 5500 Sol/s...
There are some limitations for GPUs count or any settings for nvOS?
See nvidia-smi:
m1@rig-bafomet:~$ sudo nvidia-smi
Fri Sep 15 13:16:47 2017
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 384.59 Driver Version: 384.59 |
|-------------------------------+----------------------+----------------------+
| 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... Off | 00000000:01:00.0 Off | N/A |
| 40% 44C P2 217W / 220W | 720MiB / 11171MiB | 99% Default |
+-------------------------------+----------------------+----------------------+
| 1 GeForce GTX 108... Off | 00000000:02:00.0 Off | N/A |
| 40% 45C P2 219W / 220W | 679MiB / 11172MiB | 94% Default |
+-------------------------------+----------------------+----------------------+
| 2 GeForce GTX 108... Off | 00000000:03:00.0 Off | N/A |
| 40% 44C P2 217W / 220W | 679MiB / 11172MiB | 38% Default |
+-------------------------------+----------------------+----------------------+
| 3 GeForce GTX 108... Off | 00000000:04:00.0 Off | N/A |
| 40% 42C P2 226W / 220W | 679MiB / 11172MiB | 51% Default |
+-------------------------------+----------------------+----------------------+
| 4 GeForce GTX 108... Off | 00000000:09:00.0 Off | N/A |
| 40% 43C P2 210W / 220W | 679MiB / 11172MiB | 44% Default |
+-------------------------------+----------------------+----------------------+
| 5 GeForce GTX 108... Off | 00000000:0C:00.0 Off | N/A |
| 40% 46C P2 221W / 220W | 679MiB / 11172MiB | 48% Default |
+-------------------------------+----------------------+----------------------+
| 6 GeForce GTX 108... Off | 00000000:0D:00.0 Off | N/A |
| 40% 47C P2 207W / 220W | 679MiB / 11172MiB | 94% Default |
+-------------------------------+----------------------+----------------------+
| 7 GeForce GTX 108... Off | 00000000:0E:00.0 Off | N/A |
| 40% 54C P2 211W / 220W | 679MiB / 11172MiB | 97% Default |
+-------------------------------+----------------------+----------------------+
| 8 GeForce GTX 108... Off | 00000000:0F:00.0 Off | N/A |
| 40% 39C P2 221W / 220W | 679MiB / 11172MiB | 98% Default |
+-------------------------------+----------------------+----------------------+
and number of plugged GPUs in mobo:
m1@rig-bafomet:~$ sudo lspci | grep -i VGA | wc -l
11
Thanks for advice