What? I think you missed some years dude…
Redshift is not hybrid its GPU only.
Also its cheaper to buy some GPUs than to buy a whole new workstation.
GPU Renderers are Rock solid in the meanwhile.
Also VRay, Arnold and Renderman are going GPU already (partly).
Why is trusting Nvidia suicidal?? I use Nvidia Cards since ever without a single problem.
You wait months and weeks for a render? Maybe you should consider switching from your old Xeons to GPU? You know time is money.
Before i had a 15 PC Renderfarm, now i render on 2 PCs each 3 Nvidia cards and a lot faster.