Mostly RX 480/580 8GB cards. Asus STRIX, Sapphire Nitro+ and  MSI Gaming X. Also a Saphire Pulse RX 580 4 GB and a Nitro+ RX 570 4GB with a EVGA 1600 W T2 for the motherboard, all 13 risers and 4 cards VGA power on a 120V 20A outlet together with a EVGA P2 1000 W + G2 850 W for the rest of the cards on a 15A circuit. All the cards have a Polaris Bios Editor v1.62 'one click timing patch' Bios mod and I get the best result with the Sapphire Nitro+ RX 580's 30-30.5 MH/s ETH 875 MH/s DCR dual mining.

What Bios mod have you done with the cards that are crashing?

The stock core clock is set for gaming and is too high for mining Ethash, which is a memory intensive algorithm. Also switch the riser with another card that's working to see if anything changes.

Where are you getting 16 AWG cable can provide up to 400 W? According to this wire capacity chart the maximum rating for 16 AWG cable is 20A for a short run which at 12V is 240 W. Stop claiming your fantasies as fact, it's dangerous. The fact that some PSU's come with dual 8-pin PCI-E cables and connectors which ARE intended for 150W each, doesn't mean it's a good idea to use them for a mining rig which is under constant high load 24/7.

20 A x 12 V = 240 W

http://www.rowand.net/shop/tech/wirecapacitychart.htm

No, none of the Afterburner versions work with the Crimson Relive 17.1x.x drivers on Windows 10 v1709. The blockchain drivers work with v1709 and Afterbuner, but it causes the Windows UI to become unresponsive, so I rolled back to the blockchain drivers on v1703 and it's working fine.

What you may like and what reality is are two different things. The PCI-E System Power Delivery Requirements (page 14) calls for 12.5A from a 2x4 connector (8-pin) and 6.25A from a 2x3 connector (6-pin)

https://us.v-cdn.net/5021640/uploads/editor/yr/f1z842765sj9.pdf

12.5A x 12V = 150 W

By rail I mean the PCI-E connector on the PSU. The rated power specification for a PCI-E 8-pin connector is up to 150 W and 75 W for a 6-pin connector. No PSU PCI-E connector or cable is designed to pull 300 W from a single connector.

Never use a PCI-E 8-pin splitter to power dual 8-pins. That's a good way to overload your PSU cable and rail with close to 300 W. I use PCI-E splitter cables with 8-pin + 6-pin on the same GPU or with dual 6-pin for risers but never with dual 8-pin connectors.

You either need to add another PSU with enough PCI-E connectors for the VGA inputs and use a dual ATX splitter cable so they come on and off together or use a large enough server PSU with enough PCI-E connectors and a Pico adapter for the 24-pin, CPU and Sata connectors.

https://www.aliexpress.com/item/2017-New-Arrival-30cm-24Pin-Dual-PSU-ATX-Power-Supply-Sync-Starter-Extender-Cable-For-BTC/32825280357.html?

The Afterburner developers are claiming the problem with blank settings on Windows v1709 is a driver issue releated pixel patcher.

https://forums.guru3d.com/threads/afterburner-fails-to-display-clocks-on-patched-crimson-17-10-drivers.417926/

Maybe they will fix it but honestly it looks like they gimped Afterburner intentionally with multiple GPU builds because they are butt hurt about miners buying up GPU's

https://forums.guru3d.com/threads/13-gpus-and-or-latest-nvidia-driver-388-31-afterburner-crash-instantly.417993/

https://forums.guru3d.com/threads/13-gpus-and-or-latest-nvidia-driver-388-31-afterburner-crash-instantly.417993/#post-5493937

I reverted back to using the blockchain drivers on Windows 10 v1703 and Afterburner is working.

I wouldn't hold my breath waiting for Asus to release a firmware update. Dual mining ETH + DCR a RX 570 will pull ~140 W between the GPU and riser and a RX 580 ~180 W. I have a 13 card mixed card build on a H110 Pro BTC+ dual mining ETH + DCR and it's been rock solid. Total power draw at the wall is 2475 W with a triple ATX PSU setup.



I was running it off of a dual 120V 2400W PSU I ordered from a manufacturer on Alibaba and a 1000 W ATX for the motherboard and risers. The dual 120V 2400 W PSU has 18 PCI-E 6+2 connectors that I use for the GPU VGA power inputs. Total cost through PayPal was $181 and shipping via DHL direct from the manufacturer was very quick.

http://www.panto-tech.com/products/206-110v-260v-power-supply-2400W-for-miner.html

For a while it ran quiet at less than 50% of the capacity. When you run it at more than that, the fans got progressively louder the more wattage you pull from it. Recently the fans started running louder and it became annoying to deal with the constant high pitched whining sound. I got tired of dealing with the noise and switched to a triple ATX PSU setup with a triple ATX power adapter cable.

https://www.aliexpress.com/item/New-24-Pin-20-4Pin-Triple-PSU-ATX-Power-Supply-Adapter-Cable-18AWG-Wire-For-Mining/32827769189.html?

The same manufacturer also has the same PSU with only the 18 PCI-E connectors and it's about $30 less, so I think that may be a better option for a dual PSU setup since I don't use the ATX 24-pin or sata/molex connectors on it.

http://www.panto-tech.com/products/207-110v-220v-power-supply-2400W-for-miner.html

This is the same PSU BBT used in his 21 card build on the Asus B250 mining expert live stream and you can hear how loud it is.

https://www.youtube.com/watch?v=miUoqnUqk9M&feature=youtu.be&t=6201

If you want to mine ETH to cash out in to fiat and are in the US, you can use a GDAX (owned by Coinbase) ETH wallet address, trade the ETH to BTC, transfer the BTC to Coinbase for free and then sell the BTC for USD and transfer it to your bank account for a fee or get a Shift debit Visa card connected to your Coinbase wallet to spend the BTC with no fees. For a pool I like Ethermine.

You won't be able to run all 18 cards on the same motherboard. Running more than 13 GPU's with the Asus B250 mining expert REQUIRES using Nvidia P106 mining cards.

https://bitcointalk.org/index.php?topic=2357461.msg24031325#msg24031325

If you want to run all AMD cards I would suggest breaking it up in to a 12 card build on a ASRock H110 Pro BTC+ and a 6 card build on a Biostar TB85 or another H110 Pro BTC+ motherboard if you plan to expand.

With POS coins you are staking coins i.e. holding coins in a full node client wallet to accumulate enough stake to mine a block and earn a reward based on the POS annual percentage rate for that coin. Typically with POS you can hold any number of coins and still be eligible to stake. The more coins you have and the longer you have them staking, the quicker you will be able to earn enough stake to mine a block and earn a POS payment. Your client node doesen't need to be online to earn stake, but it must be online to be able to mine a block to earn a reward.

With masternodes you are hosting a full node client and holding a fixed number of coins as collateral in order to be eligble to perform network functions for the blockchain and are rewarded a fixed number of coins from the POW block for that service. Your masternode must be online in order to be able to qualify for a payment.

1340 MHz core and 2150 MHz memory clock is way too much for a RX 570. Try setting 1200 Mhz for the core clock and 2000 MHz for the memory.

The stock clocks are set for gaming performance which has nothing to do with mining performance. The core frequency is set too high by default. It will reduce the hash rate of your cards and likely be unstable for mining if you just run the cards at the default settings. Running the cards at the default power settings is just increasing your cards power consumption, lowering your profitability and heating up the cards.

You can mix different cards and brands on the same rig. Any core/memory overclocking or undervolting settings will need to be done for each card separately unless you hard code them in the Bios of the cards.

Like I said, you need to research the best core and memory settings for your card. Maximizing the hash rate for your card involves lots of research and tweaking for the coin you are mining.

You need to research and try out different core and memory clock overclock settings for your card to maximize the hash rate on the algorithm you are mining. With some memory intensive algorithms like Ethash and Monero you also need to Bios mod the memory timings on AMD cards to maximize their hash rate on those algorithms. In addition with the RX 460, you can try unlocking the shaders to see if it boosts your hash rate.

https://www.youtube.com/watch?v=8n9tgRw_JkM

https://www.youtube.com/watch?v=-VuPm8N5T0w

Scrypt ia also an ASIC only algorithm for years. I would suggest downloading the NiceHash legacy miner and running the benchmark. That will tell you your rigs hash rate on various algorithms and then you can use whattomine.com to see which are currently the most profitable coins to mine with your cards.

https://github.com/nicehash/NiceHashMinerLegacy/releases

You will likely find Ethash coins like Ethereum or Equihash coins like Zcash are your best option. Otherwise the NiceHash miner will also automatically mine the most profitable coins for your rig and pay you out in Bitcoin once you meet the payment threshold.