(03-04-2014, 10:26 AM)NaturalViolence Wrote:drhycodan Wrote:Well it just proves Haswell is much faster in single threaded performance and IPC over Ivy Bridge. Maybe no other app has tapped into Haswell's true potential because they are mostly multi-threaded based? Why do you think the hexa-core i7 extremes always come out on top? Surely, it's not about their single threaded performance.
That doesn't make any sense. The performance per core should not change between singlethreaded and multithreaded applications. Haswell is usually around 5-15% faster clock for clock than ivy bridge in either case. In dolphin and PCSX2 however it's 30% faster. i7 extremes only come out on top in highly multithreaded applications. They perform the same as regular sandy/ivy bridge cpus in applications that use 4 or less cores (most apps) including dolphin.
degasus Wrote:Maybe haswell just improved on executing our shitty jit code.
Well obviously, but why? Which specific optimizations are doing this? 30% is a really big gain.
My guess seeing the impact in ipc faster cache has in the dolphin benchmark for people who overclocked their cpu cache and the graph below:
http://media.bestofmicro.com/K/0/386928/original/cache.jpg
is that perhaps is due to faster cache memory.