RTX 4080 does not offer NVLink or SLI support so you are probably out of luck.
The only way you could use them if you could assign specific task to separate GPUs for calculations (that don’t depend on variables between them). That is a very specific scenario that I doubt Epic will add to the engine.
With no VNLink you are also limited to the VRam of 1 card (no joined memory pooling)
