Smart Access Memory (SAM)

DirectX 12 Update Allows CPU and GPU to Access VRAM Simultaneously

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Microsoft has announced a new DirectX12 GPU optimization feature in conjunction with Resizable-BAR, called GPU Upload Heaps (opens in new tab), that allows the CPU to have direct, simultaneous access to GPU memory. This can increase performance in DX12 titles and decrease system RAM utilization since the feature circumvents the need to copy data from the CPU to the GPU. The new feature is available now in the Agility SDK.

We don’t know the actual implications of this feature, but the performance advantages could be significant. Graphics card memory sizes and video game VRAM consumption are getting larger and larger every year. As a result, the CPU needs to move more and more data between itself and the GPU.

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