see https://www.techpowerup.com/gpu-specs/rtx-spark-n1x-6144-cor...
But many of the specs on that page are estimates, but given this is a mobile-specific SoC, you can assume that the perf-envelope is lower than the DGX Spark SoC.
Not sure what the speeds are, but a CAT6 port seems to be present.
The pics for the Microsoft Surface Laptop Ultra are pretty dark, especially around the ports, as well. I don't see an Ethernet RJ45 port nor is any listed under Key Tech Specs for the Laptop Ultra.
The engadget article just mentions "Ethernet port" for the RTX Spark Dev Box - no speed rating. see https://www.engadget.com/2280520/microsofts-surface-rtx-spar...
The DGX Spark has 10G Ethernet, so you'd hope for about $1K less, you'd still get 10G.
The top looks like a crumb/dust magnet.
from the main RTX Spark Dev Box page,
"Surface RTX Spark Dev Box features an anodized aluminum body with 1,000 air vents built into its grid chassis—a nod to its 1,000 teraflops of compute performance."
Why is the headphone jack on the back???
I think there are two buttons on the top rear left of the box - I'd hope power and reset buttons.