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The ConnectX 7 2x200 Gbps networking card in the DGX Spark alone is worth $700

To be fair the connectx-7 in the spark can't even push 2x200 Gbps since it is connected via 4 pcie lanes.

Technically it's connected via 8 PCIe gen 5 lanes (two 4x connections), allowing ~100Gbps per port.

Thanks for the correction. I should have looked it up; I only remembered it being somewhat odd.

Yes, ConnectX-7 itself is capable of 32x PCIe5 lanes, but the lane limitations of the GB10 SoC/chipset throttle it: