You can almost triple your frame rate in Cyberpunk 2077 using multiple GPUs, but SLI this ain't

pcgamer.com:

Artificial frame generation technology. Even typing those words feels vaguely science-fiction, but ever since the release of Nvidia's DLSS 3 Frame Generation (and much later, AMD's Fluid Motion Frames), it's become a concept that's gone beyond the theoretical into the everyday. However, Korean technology website QuasarZone (via Videocardz) has taken things to a new extreme by managing to run both methods at the same time via an impressive bit of GPU wrangling, and the performance gains are, on the surface at least, rather impressive.

To achieve this mind-bending result, both an RTX 4090 and Radeon RX 6600 were installed on the same motherboard, with the monitor connected to the AMD GPU. The RTX 4090 was then forced to render a game with DLSS 3 Frame Generation enabled, while the RX 6600 was used as an output source to the monitor using AMD Fluid Motion Frames. This means the eventual output was rendered at a higher frame rate using DLSS 3 Frame Generation, then interpolated once more through the RX 6600 to even higher levels still.

The results at first glance seem very good indeed. Cyberpunk 2077 at a 4K output resolution jumped from an average of 71.7 fps all the way up to a gigantic 209.3 fps with both DLSS 3 FG and AFMF enabled. That's nearly triple the frames, and quite an impressive demonstration, as proof of concepts go.

It wasn't just Cyberpunk either. Call of Duty: Modern Warfare III nearly doubled its frames using the technique, with a leap from just under 128 fps all the way to nearly 226 fps, while Ratchet and Clank: Rift Apart managed 233 fps with both methods enabled, up from an average native frame rate of just over 121 fps. Even the notoriously CPU-bound Starfield received a significant performance jump,