# Designing an open-source budget 4x V100 SXM2 NVLink backplane — passive PCIe vs PEX8749?

> Source: <https://forum.level1techs.com/t/designing-an-open-source-budget-4x-v100-sxm2-nvlink-backplane-passive-pcie-vs-pex8749/250801?page=2#post_41>
> Published: 2026-08-30 07:29:59+00:00

Do you actually have a good source for info on the 1CATai developments? The best I’m aware of is this [The Most Esoteric eGPU: Dual NVIDIA Tesla V100 (64G) for AI & LLM](https://blog.rexyuan.com/2025/09/30/v100/)

I gotchu [Reverse Engineering the NVIDIA SXM2 Socket | Benchoff Design Portfolio](https://bbenchoff.com/pages/SXM2PCIe.html) . I actually already had this open.