I understood what you meant, but 2 *full* 4k feeds for each eye is not up to the GPU makers, but is instead up to the HMD ones. If your HMD only supports a single large input cable but twin displays with independent resolution, then VR SLI already caters to one GPU per eye, regardless of resolution. If you're talking 2 display cables feeding separately to keep up with display needs, it's not necessary until bandwidth requirements for each display exceeds current standards. Pimax's design is an outlier - they basically have an HMD that cannot be utilized at full 200 FOV by most GPUs out there, both due to display and rendering power requirements. Even the HTC Vive Pro isn't 4K per-eye yet. Once more production HMDs start requiring a lot more bandwidth, one could reasonably expect something like a newer VirtualLink or maybe something like a Dual-Link VL tech that will allow this.