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DGX Spark is $4700, so I kind of doubt that RTX Spark's top configs will be cheaper than that.

The DGX also contains the 200 GbE networking and linux support.

Laptops will also have to contain a much tighter configuration, display, keyboard, camera, etc ;)

there is desktop variant as well

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:

isn't dgx ai first and rtx prosumer first. I think it will be cheaper longer term not atm with component inflation