Check that the 12v rails provide enough amps for the GPU. If the performance is good enough, I'd use it.
I run power supplies until they become insufficient, die, or no longer have the connectors I need.
I use a 2.5gbps Trendnet TEG-25GECTX as the LAN connection of my PFsense. Hosted as a VM in Hyper-V. Works fine. I occasionally use the iperf package on it for testing network performance on the network.
I find it more interesting now than I did at launch due to the price. For the same price as a 7800X3D and being sub $400, those extra four cores are enticing. My personal use computers will be solely full power, full feature cores, until I'm not...