eGPU with Mac Pro 2013

How much would an eGPU help me out with blender performance?

I have a Mac Pro 2013.

  • 3.5GHz 6-core with 12MB of L3 cache
  • 64GB of 1866MHz DDR3 ECC
  • Dual AMD FirePro D500 GPUs with 3GB of GDDR5 VRAM each
  • 256GB PCIe-based SSD

Just wondering if an eGPU would get me better viewport performance and render times.

I’m thinking of buying this product:
Sonnet eGFX Breakaway Box 550W

NVIDIA GTX 1080 Ti, 11 GB, 3 DP, HDMI (3584 CUDA Cores)

Apple Thunderbolt 3 to Thunderbolt 2 Adapter


A known limitation is the OS version : 10.12.6 -> 10.13.3.