You can tell by the shape of the board that it's meant to go into a server chassis behind a stack of 80mm blower fans. It's not meant for consumers, but you will be able to buy it used for $200 off ebay in 7 years to put in your home lab.
I know modern card architecture doesn't support this out of the box, but what is the actuall problem of forwarding a once-rendered frame to another card for output? Sureley DMA transfers PCIe->RAM->PCIe nowaday are fast enough to saturate 60fps at 4K?
I had a crazier setup in the past with the Intel i7-8809G APU: it had an AMD iGPU for desktop connected to the display, nVidia eGPU for games and the Intel iGPU for video encoding.
Of course there is additional latency due to frame copying, but I can’t notice it in practice.
While transfers have improved a lot the amount data needed for 4K60 with HDR is about 18Gbps. There's no way that doesn't have an impact.
> We want to render applications on the more powerful card and send the result to the card which has display connected.
I wonder how they feel about selling their RAM business a few years ago.