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Here are the steps I took to get 6 gpus instantly working

1. Dont use onboard graphics, use primary graphics card
2. Enable 4G decoding
3. Perform clean install of latest nvidia drivers and reboot

Now WAIT AFTER IT RESTARTS. Hit control+shift+esc to bring up processes. Notice that Nvidia install manager starts running. It ran a total for 6 times for
me, presumably for each card. This takes a while (took 10 mins on mine). It will run in a loop between Nvidia stuff and windows installing.

Then your cards will show up.

If it works would mighty appreciate some coins!

BTC: 1JToePxsYm69YvitsccA8e8zfVjsAvb575
ETH: 0xf819a2BB3625Da0E46a68248Be3301709741504a