[jms55]

Yep, this is another great callout. Desktop GPUs are (in my experience) often heavily memory limited, and that's with their big high bandwidth memory chips. The latency is a problem, but latency hiding means overall throughput is good and it works out in practice.

iGPUs have less latency, but also much less bandwidth. So all those global memory fetches in modern GPU algorithms become much slower, when looking at a birds-eye level of overall throughput across the dispatch. It's why things like SSAO are way more expensive on iGPUs, despite needing to operate at a lower resolution.