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144Hz Monitor loses signal with Vega64

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Ein

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My pc as it stands:
LG 24GM77 FHD 1920x1080 144Hz (3 y)
Dell SE2416H 23.8" FHD LED 1920x1080 (1.5 y)
MSI Vega 64 8GB Blower style (1.5 y)
G.Skill TridentZ RGB 16GB (2x8GB) DDR4-3000MHz (4 m)
AMD Ryzen 5 2600 3.4GHz (4 m)
Stock AMD cooler
WD 240GB M.2 SSD (4 m)
MSI B450M Pro-M2 Micro-ATX MB (4 m)
D-Link Wirelesss AC1200 Dual Band PCI-E adapter (4 m)
Corsair AF120L 120mm 1300RPM case fan x3 (4 m)
Super Flower SF-850F14MT(BK) Leadex 850W 80 Plus Silver Certified PSU (4 m)

I'm using an hdmi to the 60Hz dell and a Display Port cable to the 144Hz LG. My problem is that the LG loses signal every so often, as if the cable is unplugged or something. Last night (for the first time) the screen just went black and white at about 3sec intervals. I had underclocked my GPU significantly as I read on some forum that that would help. The guy on the forum still has issues, so I'm hoping carb can help me. I suspect the it's the GPU as everything seems to be fine. It seems to be slightly common for older Radeon cards to give this problem, with no solution in sight.

Please note when I got the Vega 64, it had never been overclocked and was used in a crossfire setup. I had issues of my PC crashing within minutes after starting the PC. It seemed to have been a driver issue as I managed to solve it by installing and downloading the drivers on a 100Mbps line. I have full warranty still with evetech on the GPU.

To save some time I'll mention some of what I've tried:
1- Tried only one display at a time. LG still loses signal, Dell works perfectly.
2- Tried lower refresh rate.
3- Tried hdmi on LG. Nothing happens but only go up to 60Hz.
4- I can't use DVI as the GPU only has hdmi and DP.
5- IOverclocking the GPU.
6- Underclocking GPU.
7- Tried using different DP ports on gpu.
8- Tried duplicate monitor instead of extend. LG still loses signal and runs at 60Hz.
9- Reinstallation of GPU drivers.
10- Found what seemed to be drivers for LG and installed it. The monitor is supposed to be plug-n-play so doesn't need it.
11- Tried using 1080ti on monitor. Works perfectly.
12- Swapped around the GPU power cables.

If this persists with no solution, I'll RMA the GPU or sell it and get myself back on the Green team. A lot of effort that I'm not looking forward to, please help.
 
Exact same issue with dual screens and a Vega 64 , I find it only happens if my pc has bee on for a while . First few hours after a reboot its fine.
 
It normally takes a few hours of gaming but it also loses signal when browsing. This is a temporary solution and results in loss of data as I study on my rig as well.
 
I had that issue with my Vega 64 and RMA’d it. Got a RTX 2070 as a replacement. I still want a Vega 64 but I’m not willing to get a second hand one again just to find out it’s suspect.
 
Makes sense. Monday I'll start the RMA process. If you don't mind me asking..... Who did you RMA with? Was this your only issue or did you have other issues?
 
It was with Evetech. The first issue that made me think the card was suspect was when it restarted the PC when I opened the inventory box in Ghost Recon Wildlands. This happened multiple time. Then it did restarts during CSGO comps.

Evetech tested the card and their finding was loss of signal under load.
 
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Try a different and confirmed working display port cable.

I've had a few oem cables die on me at work - symptoms are similar.
 
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