Hi niranjan94,
did you get this solved? Nvidia does not like you to use their "cheap" GPUs in VMs.
If not you can try the following:
1. Pass the GPU AND! the Sound Card through
2. set a value for the vendor_id (<vendor_id state='on' value='2DAH34DEBB0E'/>) - exactly 12 characters
3. hide that it you use a vm (seems that u tried it already)
<kvm>
<hidden state='on'/>
</kvm>
</features>
4. Download the GPU Bios (https://nvidia.custhelp.com/app/answers/detail/a_id/4188/~/extracting-the-geforce-video-bios-rom-file)
- 4a. Give Unraid the downloaded BIOS for booting (You've tried this already)
- 4b Edit the downloaded BIOS with a HEX Editor
-- 4b.I. Search for the first existing U² remove everything before this (Keep the U²)
-- 4b.II Save the BIOS to a new file and do step 4a with it
I hope one of the tips lead to success.
Regards
Markus