You said you were using nicehash, but have you tried a different miner? Also im assuming your mining on windows, but possibly load something like ETHos on a flash drive and boot that up and see if they work on that. Just throwing out some ideas to try and isolate the problem.

This coin is not decentralized at all because it was made by the Venezuelan government, this is the exact opposite of what a cryptocurrency should be. The Venezuelan government has been known to lie in the press releases about how much money has been raised so take everything you read about it with a grain of salt. I would not invest in this coin. Plenty of other much better coins to invest in.

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The 2000 series will be extremely hard to get for a while after they launch, and will probably have inflated prices as well. If you go ahead and get a 1080ti now or even a 1070 or 1070ti you will have plenty of time to mine with these cards. The top tier cards like the 1080ti will still be profitable for a while even after the 2000 series launches.

The Pentium has a higher performance, but the Celeron is $20 cheaper, and for a mining rig the Celeron will be just fine. Might as well save the money.

You can add them manually by going to tools debug console and then entering the command "addnode [ip address] add" and do that for each one. Or you can put them in a .conf file.

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I know this isn't exactly the advice you were looking for but I would honestly sell the 570's, because there current price is extremely high and invest that money into a 2nd 1080ti. The 570s days are numbered but the 1080ti will be a good investment for the future. If you sign up for the alerts on nowinstock you can snag another 1080ti for $800-$900 and you could potentially sell the 570s for $300+ a piece. Just a thought.

This motherboard has 6 PCIe slots, so 6 cards will work. It also has 2 m.2 slots but you would need to check that these are not shared with the PCIe slots on this particular motherboard before you hooked up 2 more cards. The m.2 also require an adapter.