Inside the Snapdragon 855’s iGPU

Qualcomm's Adreno 6xx architecture has been superseded Adreno 7xx, but it's still used in countless devices, including the current-gen Snapdragon 8cx Gen 3. Here, I'll be looking at the Adreno 640 GPU in the Snapdragon 855. Zarif98 on Reddit kindly provided a OnePlus 7 Pro, and I'll be using that to check out Adreno 640.

Compared to the older Snapdragon 821's Adreno 530, Adreno 640 dramatically increases compute throughput while still working within a very constrained power and thermal envelope. Process node improvements help, and TSMC's 7 nm process should be far better than the 14 nm Samsung node used in the Snapdragon 821. But cell phone SoC constraints meant Qualcomm couldn't go around copy-pasting basic GPU building blocks and call it a day.

Chips and Cheese

Chips and Cheese with another deep dive.