First one Pre-baked MLL at 4k was a 4% difference, For Honour 4k was a 15% hit, The division 4k was 15% difference, Hitman 4k was 6%, ROTTR 4k was 9%, SOTTR 4k was 8%, Deus Ex 4k was 3%. These were all the canned benchmarks which the majority of reviewers use to save time. On not one occasion was the new driver faster and there are some big differences in there. As i said the in game tests showed varying results but they were also just one run through and pretty random in some cases.
I am not saying it's 100% proof of gimping but why in not one canned game bench is the new driver faster and way slower in half of them.