I guess you are using AMD cards, am I right?
It's happened to some AMD cards. But don't worry, a dummy video output without connecting to monitor is more than enough. You can use HDMI adapter or something else that you can use on your mining cards output socket.

Efficiency means how much power from the wall would be drawn by the PSU at a current output power.
You must give more power spare at your PSU. Look what I've done with my RM1000i:

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In certain situations, your cards will draw more power from your PSU, ex. When your cards adjust fan speed to keep temperature, and it will draw more power.

Point taken!
Really, I like what you do. When we know the key, with whatever devices we have, we can do Solo Mining. Keep going!

It seems they try to do "Solo Mining" to their own mining pool, so they were asking you to build private mining pool, right? xxcsu has given you the link to do it.

I meet someone that do solo mining on ETH. 31,5 GH/s from 900 GPUs, solving around 2-3 block a day.


You can see its post here: https://bitcointalk.org/index.php?topic=2861658.msg32772992#msg32772992

Never mind! 

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Technically full patch wouldn't adverse effects for mining process, Pixel Clock and Refresh Rate patching, used to allow higher resolutions and refresh rates. While the mining process using computation mode, so high resolution, and refresh rate didn't affect much in the mining process

Atikmdag patcher used for modded bios cards, to bypass driver signature check by the system so that the system will recognize those card. Unverified driver signature may be causing BSOD.

If your hashrate 50% or more from the Global Hashrate, 15 minutes "may enough", but also you need to consider coin's Block Time. Based on my experience, ideally one hour.

Have you tried one only card plugged?
Did you find something strange on cards or PSUs, melted or whatever? Just for making sure no physical damage.

You can start with standard troubleshooting. Check all cards one by one (plug cards one by one to mobos).

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And you can report all of the progress here. All members here would help you.

As long as your cards made a profit, even if just a bit profit, no reason to stop it, right?

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Yeah, make sense.
OP - may you need to check your card's temperature.

Set PCIe to Gen 1 or Gen 2, and set Top Of Lower Usable Dram (TOLUD) to 3.5G, it would be under PCIe setting in your mobo's bios. Also, don't forget to enable 4g decoding.

Edit: Seems has fixed, above. 

What kind crashing you mean? Froze? Blank Screen? What is miner software you are using now? Which coins?
Have you tried to lower your cards setting?

Or may you need to increase Virtual Memory/Pagefile (if you haven't do it).

Have you tried it? I have been to do it many of times. Maybe you need to download it and tried it to your modded cards (If you have it). Or may you want to Google it, let me give you the subject "rename atikmdag-patcher.exe to atikmdag-patcher-bios.exe". Cheers up!  

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Edit:
Oh damn, you don't need to google it. theodrim helping you well:

OP, here this more simple suggestion:

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just add a little info about pixel clock using, if you just want to bypass bios signature without change another thing, rename atikmdag-patcher.exe to atikmdag-patcher-bios.exe, it will make bios signature only that patched.

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Almost same as pooled mining, with 31.5 GH/s seems you get 2.4 ETH (Calculator say) ATM. But with solo mining, you have a chance to get 3 and more ETH. It seems a good choice for solo mining at yours Hashrate.

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Everywhere.
Old thread coin Ann, even Whattomine, Coinwarz, wherever. If you know the key, it will make you have a different view with regular miners when seeing some coin with technical info.

I do solo mining with old coins (many times).
The main purpose of mining is solving blocks. When most people think a new coin is better for solo mining equal to the new coin would have a ton of miner. And it will be unprofitable for solo mining.

Remember: Fewer miners = Low Network Hashrate = Low difficulty = You will solving more block = More profit

So, Network Hashrate would be the first thing to be considered.

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Sometimes people will forget the old coins, especially the new miners, it will be an advantage for us, right? Back to "Remember" point above.
Calculate these few things to get the most profitable coin for solo mining, Network Hashrate, Difficulty, Block Reward (how many coins you get every time you solve a block), don't forget about block time, and the last thing that needs to check is coin price. and You are ready for Solo Mining! 

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With the right calculations, Solo Mining truly different with the lottery.
Same as you, I didn't recommend for a un-experience miner to do solo mining.

OP - If you want to do it, just learn how to do it, and go for Solo Mining. You'll get a ton experience.

Finally no one was infecting you here.
Asking suggestion between 3 Gtx 1070Ti and 2 x Antminer L2, and you opted Baikal Giant X10. How dare you. 

Congrats! and Happy mining.

First, you do a wrong (proper less) way to mod your bios. Don't ever flashing your card with downloaded bios. It will be affecting your cards, unstable or even damage.

Better to do it yourself, newest PBE has a one-click mod function (good enough for starting to learn). And next, you can improve your modding way.
This is what I mean:


1. Under Global Settings I cannot find the GPU Workload > Computing option for any of the cards.


2. If I bump the memclock in AB to 1900mhz only GPU0 seems to pick up the new setting although the Sync option is checked for all of them.
   Uncheck Sync option, do it one by one.

3. When I saved the original bios for all 6, 3 of them are 256kb and 3 are 512kb... what gives???
   Did you save it by GPU-Z or AtiFlash?

As they said, you need to wait until at least you give one share to the pool.
And you are doing wrong with your bat file, see suggestion by whoismoses.


replace / (slash) after wallet address with . (dot)
have you fixed it?

You are the man! 
How many blocks solved each day by the way? Am curious to compare with pooled mining estimation.
Have you tried other Ethash coins? Music coin maybe?

Please be specific!
All of your cards undetected? It must be something wrong more than Risers. We need more info about your rig setup.

Board you are using: ?
PSUs, with power scheme if possible: ?
Operating Systems: ?

as detailed as possible that you can explain.

You will need two different drivers for both cards. I suggest installing RX 480 driver first, then install the driver for HD7970. After that, may your RX 480 will be troubled (yellow sign in Device Manager). But don't worry, just do a manual update on your RX 480 driver. And you ready to go.