@neekir
I tested MSI Armour, EVGA SC and Gigabyte OC. They work with mem +500. Sorry to hear about Zotac doing a weaker job.
Mining cryptonights is just for the purpose to teak your OC settings. The core frequencie will show a fixed number, not jumping around as with zec miners. Than you can switch to equihash.
One more thing... Maybe is something wrong with nVidia drivers. Unistall CUDA drivers (in case you installed them), unistall nVidia drivers, you can do a restart, or jump to the reinstall directly.
1.Install nVidia drivers (the last version, and no need for Geforce expirience or Phisix).
Watch in the Task manager if any nVidia Container process uses CPU more than 1-5%. Wait for it to stop (it means that all the GPU's are installed).
BTW... Idealy, you should have only one nVidia Container process runing. If there are more, when you will install CUDA in last step, all those will be replaced with only 1 instance.
2.Download Microsoft Visual studio (VC-redist) both versions x86 and x64 from
www.visualstudio.com/downloads/ (the second from bottom down).
Go to "older versions" and download the 2015, the 2013 and the 2012 versions x86 and x64.
Unistall all versions of Visual Studio from Control Panel > Programs.
Install in this order: vc_redist 2012 x86 and x64, 2013 x86 and x64, 2015 x86 and x64, 2017 x86 and x64.
3.Reboot!
4.Install nVidia CUDA drivers (toolkit... whatever), last version, from here developer.nvidia.com/cuda-toolkit-archive.
CUDA drivers are needed for cryptonight miners, but is good to have them installed.
Reboot!
And PLEASE !!! FIX your PING!!! 260ms is NOT GOOD FOR MINING!!! You must have below 100ms, 30-60ms will be awsome.
Here's how to choose the best pool:
Look at pools lists like "investoon.com/mining_pools" or "miningpoollists.com", choose the top 5 pools with the most miners and hashrate (you can open each pool site and check the real stats there, at pool hashrate, not network hashrate).
Take note of the link of the stratum server for your coin on each pool (the port is not important).
Open Command prompt, and type:
ping xxxxxx.yyyyy.zzz
where xxxxxx.yyyyy.zzz is the stratum server address.
Compare the time in ms. You must choose the pool with the lowest ms value.
In this way, your shares will arrive in time to be accepted by the pool, and more coins will be gained.