Hi. 

Currently own a Poweredge T430 that's used as a Plex server. Has a mixture of Dell / HP enterprise HDD's and Seagate + a 1TB NVME drive using PCIE adaptor.

I'm going to be installing a Intel Arc A750 Graphics Card, at the moment I've only got 1x 495W PSU connected. Will this be more than ample for this setup?

Specs:

E5-2640 V4 - 60GB RAM

8x HDDs
H330 - NVME PCI-E Adaptor

1x 495W PSU