Overdraw actually matters quite a bit for integrated GPUs, especially on HiDPI. On high-end NVIDIA or AMD GPUs, sure, 2D overdraw doesn't matter too much. But w

Overdraw actually matters quite a bit for integrated GPUs, especially on HiDPI. On high-end NVIDIA or AMD GPUs, sure, 2D overdraw doesn't matter too much. But when power is a concern, you don't want to be running on the discrete GPU, so it's worth optimizing overdraw.