Here are some stats from my 9 MSI Geforce GTX 1080Ti gamer x 11G card rig.
I spent the morning moving away from some base settings that I had in the SimpleMining OS overclock page. I got the originals from this forum and some of the content providers on YouTube. I'm mining Zcash with the EWBF Cuda miner. The settings I originally had worked well and were stable over a period of several days. They gave me a system that I could run in the garage and kept pretty much below 70c or very close to 65c on average day and night. After watching them a few days I couldn't help but try to get just a bit more out of them while at the same time trying to keep the heat tolerable for me and the "wife". I'm sure when she gets home from work she'll be glad to find out I accomplished nothing else.
The cards were installed right from the box to a Z270-A motherboard with what I think has the most current bios.
The cards have no updates but for the correct version of SimpleMining for Nvidia.
I added the m2.0 adaptors for the 2 additional cards changed a few things in the bios and ran the SimpleMining OS from a USB stick.
My original settings for the overclock page were Core 60 Memory 800 Power 200 Temp 75 Fan 60
Total Sols about 5800 and 3.5Sols/w This setting pushed the heat a little in my garage cards running into the 70c's
I changed that to Core 100 Memory 500 Power 190 Temp 75 Fan 70 They ran a bit cooler under 65c
Total Sols about 5600 and 3.9Sols/w This seemed good enough to run for several days with no restarts each card running between 620/645 power around 175.
Today I'm finishing with Core 150 Memory -250 Power 200 Temp 75 Fan 70.
Total Sols about 6340 and 3.89Sols/w Total watts 1622 or around 180 watts and 720 Sols per card.
I can get them a bit higher but my settings in the garage aren't completely set up yet so they get a little hot for my liking. Fresh air is the next item on the list. I'm hoping they'll last a little longer if I'm not asking too much from them.
After wading through the forums here I'm happy with the results. If anyone is able to get through my drawn out explanation here and has suggestions I'm all ears.
Sorry I wasn't able to incorporate all the shorthand you all are so good at.
The EWBF miner within the SimpleMining software is easy and seems to work well for me. The results seem predictable and steady.
I hope maybe my information will help the next person.