DDR5 helps, but not as much as you would think.

Yes, higher bandwidth helps a little, but DirectStorage is designed to make the GPU do most of the heavy lifting. The bottleneck usually shifts from CPU/Storage to GPU decompression speed and VRAM bandwidth long before DDR5 speed matters.

DirectStorage bypasses the CPU and feeds compressed texture data straight from the NVMe drive into GPU memory. The GPU decompresses it and then uses it. DDR5 bandwidth comes into play when the system has to shuttle decompressed data from system RAM to VRAM. That can be a factor if your VRAM fills up and the game starts swapping—but that’s a capacity problem, not a bandwidth one.

In practice, the difference between DDR4 and DDR5 in DirectStorage games is a handful of frames at best. You’ll see bigger gains from a faster GPU with more VRAM and a good NVMe drive. DDR5 is nice to have, but it’s not the weak link. If you already have a fast SSD and a GPU that supports DirectStorage, spend your money there first.