Will DDR5 RAM improve game load times on an NVMe SSD?

No, it won’t. If your games are already on a decent NVMe SSD (PCIe 3.0 or faster), load times are limited by the SSD’s read speed and the CPU’s decompression work, not by RAM bandwidth. DDR5 helps in tasks that hammer memory bandwidth, but for loading a level from an NVMe drive, you’re already in the zone of diminishing returns. Don’t waste the money upgrading from a DDR4 system just for faster game loads.