Intel GPU Architecture and Programming
https://software.intel.com/sites/default/files/managed/89/92/Intel-Graphics-Architecture-ISA-and-microarchitecture.pdf [software.intel.com]
2016-11-30 22:31
Starts off with some marketing stats, but then starts diving down into details about how modern Intel graphics designs work.
More info and papers available at https://software.intel.com/en-us/articles/intel-graphics-developers-guides