https://wccftech.com/nvidia-confirms-ampere-geforce-rtx-30-gpus-to-get-its-own-smart-access-memory-sam-tech/

It looks like NVIDIA has just confirmed to GamersNexus that they are working on their own SAM (Smart Access Memory) technology which will be enabled on all GeForce RTX 30 Ampere GPUs in future software updates.

According to the tweet which quotes NVIDIA's official response to AMD's SAM (Smart Access Memory) technology, the green team confirmed that resizable BAR is a part of the PCI express specifications and that NVIDIA's existing hardware fully supports this functionality. NVIDIA didn't see the need to enable this technology feature until now as its competitor (AMD) is already adding support on its next-gen Radeon RX 6000 series graphics cards based on the RDNA 2 architecture.