Are Nvidia using ecc ram? If not this should mean it is less supply constrained than regular ram.

I'm open to being wrong, but so far as I understand it ECC mostly lives at the controller level and shares the same DRAM chips across all forms of server memory (including non-ecc), which is why we see price increases across all sectors including consumer.

Those DRAM chips being the bottleneck that would require hard to build new silicon fabs to increase supply.