From 2014 to 2016 i had a Sapp 7950/280x farm..
2016 to present Aorus 1070's .. No need for vga plugs, no unstable drivers.. and profitable mining until today (eth 30mhs/125w). Not a single regret being on the green side.

But 5700xt's are worth a try and i got a nice deal on Asrock Taichis.

back to the subject..
I used a VGA/DVI adapter with some resistors back then, whats used nowadays in the digital connectors for monitor emulator??

thanks for your answer!

edit: answering myself:
https://www.headlessghost.com/

Hi PM devs,

Beginning from PM5.1c I have regular errors with code 999.

6 * ROG STRIX-GTX1070-O8G-GAMING, Win 7 Home Extended, 8GB RAM

Config is the following
-nvidia
-cdm 2
-cdmport 3333
-cdmpass xxxxxxx
-minRigSpeed 180
-rmode 2
-tstop 70
-tstart 40
-logsmaxsize 0
-nvf 2
-hstats 2

MSI AB settings:
      CV: +0
               #1      #2     #3     #4      #5     #6
      PL:   88%   88%   86%   88%   88%   90%
      CC: +102  +102  +102  +102  +102  +102
      MC: +550  +550  +460  +550  +540  +550
      ---------------------------------------
      1020w (870w PM), 186.5xMh

Driver version: 390.77

Config was not changed, drivers were not changed. Any ideas?

2020.09.26:13:53:41.484: GPU6 CUDA error in CudaProgram.cu:456 : unknown error (999)
2020.09.26:13:53:41.484: gps6 CUDA error in CudaProgram.cu:258 : unknown error (999)
2020.09.26:13:53:41.484: gps2 CUDA error in CudaProgram.cu:258 : unknown error (999)
2020.09.26:13:53:41.484: GPU2 CUDA error in CudaProgram.cu:318 : unknown error (999)
2020.09.26:13:53:41.485: gps3 CUDA error in CudaProgram.cu:258 : unknown error (999)
2020.09.26:13:53:41.485: gps1 CUDA error in CudaProgram.cu:258 : unknown error (999)
2020.09.26:13:53:41.485: GPU1 CUDA error in CudaProgram.cu:318 : unknown error (999)
2020.09.26:13:53:41.485: GPU3 CUDA error in CudaProgram.cu:318 : unknown error (999)
2020.09.26:13:53:41.485: gps4 CUDA error in CudaProgram.cu:258 : unknown error (999)
2020.09.26:13:53:41.485: gps5 CUDA error in CudaProgram.cu:258 : unknown error (999)
2020.09.26:13:53:41.485: GPU4 CUDA error in CudaProgram.cu:456 : unknown error (999)
2020.09.26:13:53:41.485: GPU5 CUDA error in CudaProgram.cu:456 : unknown error (999)
2020.09.26:13:53:41.493: GPU2 GPU2 search error: unknown error
2020.09.26:13:53:41.493: GPU6 GPU6 search error: unknown error
2020.09.26:13:53:41.493: GPU1 GPU1 search error: unknown error
2020.09.26:13:53:41.493: GPU3 GPU3 search error: unknown error
2020.09.26:13:53:41.493: GPU4 GPU4 search error: unknown error
2020.09.26:13:53:41.493: GPU5 GPU5 search error: unknown error
2020.09.26:13:53:41.507: wdog Fatal error detected. Restarting.
2020.09.26:13:53:43.949: eths Eth: Received: {"jsonrpc":"2.0","id":0,"result":["0x2cb9408d393282b9801f12470f28bd380e9ec2ff1c7fa5fd1190a9cacec54077","0x8ae454df8790ee9925f11cd620843de9a12356ab60c67e1d8a8c85a5555b85d8","0x000000006df37f675ef6eadf5ab9a2072d44268d97df837e6748956e5c6c2116"]}
2020.09.26:13:53:43.949: eths Eth: New job #2cb9408d from eth-eu1.nanopool.org:9999; diff: 10000MH
2020.09.26:13:53:44.248: main Eth speed: 0.000 MH/s, shares: 472/0/0, time: 7:19
2020.09.26:13:53:44.248: main GPUs: 1: 0.000 MH/s (75) 2: 0.000 MH/s (75) 3: 0.000 MH/s (73) 4: 0.000 MH/s (73) 5: 0.000 MH/s (85) 6: 0.000 MH/s (91)