Outside of the VRAM requirements, Doom: The Dark Ages also requires a GPU with ray tracing hardware. The game will support path tracing, as well as DLSS 4, according to Nvidia’s Jacob Freeman.
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The RTX 5070 has 12GB, while the RTX 3070 has 8GB VRAM. In addition, there is a difference between GDDR7 and GDDR6, with the former having 32 GB/s per pin speed and the latter having 50% with 16 GB/s.