I've been using this 660Ti (NVE4) card with nouveau and tested several kernels:
4.14, 4.19 and 5.3, all with the same problem. During different usage or games,
the system freezes. It is recoverable with SysRq + RE, though. It might be
possible to SSH into the system and kill this process manually, but I'm not
sure.

This freezes happens with multi-monitor and single-monitor setups. The machine
has two videocards.

I also would love to help with traces, if anyone has ideas.