Yes, the switch should be in the position closest to the video output ports.

I have the same Powercolor Red Dragon cards with Hynix/Elpidia dual timings. On Windows 10 with the AMD blockchain drivers for ZEC I get ~315 H/s with a 1325 MHz core clock, 1950 MHz memory clock, -96 mV undervolt and -15% power limit in Afterburner v4.4.0 beta 19. The bios was modded with the Polaris Bios Editor v 1.62 'one click timing patch' from jaschaknack. If you can't undevolt the cards, remove the drivers in safe mode using DDU and try again after installing the blockchain drivers. If you have a bios mod, for RX 570's you also need to run the pixel patcher to bypass the driver signature check.

If the card crashes after it starts mining, try lowering the memory to 1900 MHz and the default 1250 Mhz core clock. For ZEC it shouldn't make that much difference.

You don't overclock the cpu and memory. You can overclock the GPU core clock and memory with Afterburner like it shows in the video. Make sure it's the latest version of Afterburner 4.4.0 beta 19. You can also adjust the power limit and unlock the voltage control in the settings to undevolt the card to use less power. I use a -96 mV core voltage and -15% power limit.

If it still doesen't work with the latest Afterburner, uninstall the drivers in safe mode using DDU like it shows in the video, reinstall the blockchain driver and run the pixel patcher once it's finished and reboot.

The BBT video I linked shows you how to do it in Powershell.

That would be the case IF you couldn't accumulate more coins through mining than you can by buying the coins outright. Given your fixed costs are essentially the same for any coin you mine, the current profitability is irrelevant as long as you can accumulate more of those coins through mining for the same cost. Which obviously must be the case or there would be no incentive to keeping the network going through POW. In fact when profitability is low, it could be the best time to accumulate coins through mining vs buying, as the difficulty will also be much lower than it would be when profitability is high and everyone is mining.

A perfect example of this was in December of last year when the price of ETH was at $7-8 and mining ETH was less profitable than it is now. With an average difficulty of 80 TH and 15 second block times back in December 2016, a single six card RX 470/480 rig could mine almost 1 ETH a day. If you kept mining and accumulating coins, once ETH went parabolic last June you would have been in a much better position to profit.

https://99bitcoins.com/advanced-ethereum-mining-calculator/?eth_hash_rate=175&eth_hash_rate_grade=MH%2Fs&eth_difficulty=80482816705750&eth_block_time=15&eth_exchange_rate=7.50&eth_power_watts=900&eth_power_cost=.11&eth_hardware_costs=&eth_action=calculate

The same scenario played out for LTC and many coins that were unprofitable to mine back in 2014-2015. Those that kept mining and kept what they mined made out the best once the Alt coin market grew exponentially. Unfortunatley I only kept mining a few months after it was no longer profitable for me back then. The good news is I did keep most of what I mined and many of the coins went up 1000% since then, so I'm glad I did.

Sorry, I don't use Geth. The wiki I linked deals specifically with managing your wallet accounts. Maybe you should try another client if Geth is too complicated for you? You can import an existing keystore into the Mist or Parity clients and those should be easier for you to understand.

Make sure you are using the latest version of Polaris Bios Editor

https://github.com/jaschaknack/PolarisBiosEditor

https://www.youtube.com/watch?v=Syaf6o1SEUc

You also need to use the AMD blockchain drivers when mining ETH and the pixel patcher to bypass the driver signature check.

https://www.monitortests.com/forum/Thread-AMD-ATI-Pixel-Clock-Patcher

I have a Sapphire Nitro+ RX 570 4GB card and using the PBE v1.62 'one click timing patch' Bios mod get ~29 MH/s with a 1150 MHz core clock and 2000 MHz memory overclock.

The wiki link I provided shows the commands you need to get started with managing accounts. Google 'how to setup Geth' for lots of tutorials and videos on how to use it.

Geth is a command line client. You run it via a command prompt open in the folder where the geth.exe is located.

https://github.com/ethereum/go-ethereum/wiki/Managing-your-accounts

You should also backup up your keystore files to a safe place and run the geth client to make sure it's working.

https://github.com/ethereum/go-ethereum/wiki/Backup-&-restore

The marketcap for Alt coins was much smaller before ETH came out. It sat at less than one billion for years. Back in 2014 when I started mining most coins were direct clones of BTC or LTC with little or no difference in features or innovation. After ASIC"S came out for Scypt, X11 and the crash of BTC to $200, all coins were unprofitable after power. Like myself, most people stopped mining. Those that kept mining even at a loss, were able to accumulate lots of coins for when the market turned back around. In hindsight, that was the right thing to do. The Crypto market is much bigger and diversified now than it was just a few years ago and there is also much more innovation than in the recent past. ETH is what brought the whole Alt coin market forward IMO.

Any wallet that you want to use after the fork must be the latest version.

You don't need Geth to mine ETH on a pool, only if you're solo mining ETH. Any wallet client you use to store or transact in ETH must be the latest version that is compatible with the fork. You don't need to create a new wallet, just update the client to the latest version at the links in the blog post.

Yes, with RX 570's you need to run the pixel patcher to bypass the driver signature check with a modded Bios. It's up to you if you want to mod the Bios. It mainly helps with memory intensive algorithms like ETH or XMR. For ZEC you can try it with and without the Bios mod, but like I said it shouldn't matter much.

https://www.youtube.com/watch?v=Syaf6o1SEUc

https://www.monitortests.com/forum/Thread-AMD-ATI-Pixel-Clock-Patcher

For ZEC mining it shouldn't matter much if the Bios is modded or not. My Red Dragon Bios is modded with the PBE v1.62 'one click timing patch' from jaschaknack.

https://github.com/jaschaknack/PolarisBiosEditor

The mining reward per block will drop to 3 ETH from 5 ETH after the fork. However that is to to keep inflation roughly the same as it was at the beginning of September because the fork removes the ICE AGE difficulty adjustment, returning to the difficulty predicated on the total network hash rate, delaying the difficulty bomb for approximately 12 months until they are ready to implement the switch to POS.

The block times will also go back to 15 seconds from the 30 seconds they are now. Because of the block time and difficulty reduction, profitability should increase from where it is now by ~25% after the fork, depending on the network hash rate.

There is no need to update the miner. You need to update your wallet to the latest version before block 4,370,000 or it will be stuck on the old chain and unable to broadcast transactions after the fork. Pools should have already updated, so as miner on a pool there is nothing else you need to do.

https://blog.ethereum.org/2017/10/12/byzantium-hf-announcement

Countdown to the fork block 4,370,000

https://fork.codetract.io/

The Claymore readme hasn't been updated in a LONG time. You should use the AMD blockchain drivers. Those are the drivers optimized for Polaris cards. Since AMD changed the API starting with the Relive drivers v17.7.2, you also need to use Afterburner v4.4.0 beta 16 or higher. I have four Powercolor Red Dragon RX 570 4GB cards and with the Claymore ZEC miner I get ~318 H/s with a 1325 MHz Core, 1975 MHz Memory overclock, -96 mV undervolt and -15% Power limit in Afterburner.

https://www.guru3d.com/files-details/msi-afterburner-beta-download.html

There is no need to revert the cards to the original Bios when installing new drivers. Sounds like a card is causing the driver installation to hang. Remove all the cards from the PCI-E slots and leave a single card connected to the x16 PCI-E slot. Remove the drivers in safe mode using DDU and run the blockchain driver installer with just the single card in the x16 slot connected.

Once the driver installation completes, shutdown and connect two more cards to the motherboard. Start the computer and wait until Windows detects the cards and installs the drivers automatically. It may take a while for the cards to show up in Device Manager. Wait and confirm in the Windows Task Manger there is no running instance of the Driver Installation Module running. Once the Driver Installation Module is no longer showing in Task Manager, shutdown and repeat the process connecting two cards at a time until all the cards are shown in Device Manager.

You will then need to use the pixel patcher to bypass the driver signature check with a modded Bios to remove the Code 43 error in Device Manager before the cards will work. Just run the patcher, reboot and verify all the cards are shown in Device Manager with no errors.

https://www.monitortests.com/forum/Thread-AMD-ATI-Pixel-Clock-Patcher

You need to update your wallet to the latest version before block 4,370,000 or it will be stuck on the old chain and unable to broadcast transactions after the fork. Pools should have already updated, so as miner on a pool there is nothing else you need to do. For solo mining you would need to update to the latest version of Geth.

https://blog.ethereum.org/2017/10/12/byzantium-hf-announcement/