PCIe rebar currently uses system RAM to VRAM communication. 3dvcache to VRAM via DMA could be made possible without even accessing RAM, this would completely eliminate 50+ ns of RAM access latency (of course the necessary data needs to be already available in 3dvcache from system RAM before any of this fancy stuff happens).

I feel proud to have owned R9-280X (HD 7970). Imo, it (HD 7970) was the best card.

So was the experience of Nvidia users back when DLSS 1 came out.

x86 was about to die since 80s LOL.