In fact, according to The Register, the GPU computing performance of the GB10 chip is roughly equivalent to an RTX 5070. However, the 5070 is limited to 12GB of video memory, which limits the size of AI models that can be run on such a system. With 128GB of unified memory, the DGX Spark can run far larger models, albeit at a slower speed than, say, an RTX 5090 (which typically ships with 24 GB of RAM). For example, to run the 120 billion-parameter larger version of OpenAI's recent gpt-oss language model, you'd need about 80GB of memory, which is far more than you can get in a consumer GPU.
Or you could've just made GPUs, and then we'd all be gaming and calling each other shitheads in Valorant instead of - checks notes - literally stealing the water from poor communities.