Quick question: I am considering keeping the 3090 from my current setup to bolster my rendering speeds, instead of selling it with the rest of the rig. Since the new rig already has 2x 4090 inside, i would need to get the external enclosure for this one. Some people in my country are selling used Lenovo Legion BoostStation for cca 200 EUROs, so i was looking at that.
Here comes the question: the board (asus hero) has that USB4 port, which should work as Thunderbolt 3, if not 4. Apparently, per techpower-up article, it does share bandwith with first M1 slot, which i am going to populate (obviously). Will the bandwith of 4x PCI-E 5.0 lanes be enough for both PCIE 4.0 nvme drive and the GPU connected via the USB4? The GPU will be used for rendering obviously, not gaming, in which case the lesser USB/TB throughput compared to regular onboard PCIE 16x/8x should only be only affecting loading the scene into VRAM, but not actual render speed.
Anyway, from what i could gather 1 link of PCIE 5 is 4GB/s. So 4 of them = 16GB/s. The M2 drive is PCI-E 4.0, thus 4x 2GB = 8GB/s max. USB4 is 40Gbps thus = 5GB/s. 8 + 5 = 13, which is less than 16, so it should be fine for both at the same time. Am i doing this right? Or is there more nuance to it, something i dont know, not that straightforward?