There are some special code in dolphin that run in x64 only and some of 64 bit calculations in the recent revs.These will explain why people will get more benefit when run dolphin x64 recent build .But if you try to run win32 build in x64 windows speed will close to windows 32bit.anyway about 200-300 revs ago speed still vary depend on game but right now most of the game I have run best with x64 build.
My comp Has 2 OS,Windows XP 32 and Windows 7 64 both has minimal program install and speed defference is more than noticable.I test with all my build start from rev 5000 to now in both OS to make sure they run.
My comp Has 2 OS,Windows XP 32 and Windows 7 64 both has minimal program install and speed defference is more than noticable.I test with all my build start from rev 5000 to now in both OS to make sure they run.