I thought I saw this coming when it was 16-32. Q: what does native data registers have in common between 32 and 64 bit? A: they load data in the same time period Q: any 64bit app, os or driver not using native data registers? A: No, except for the ones not recompiled to native. Q: anything special an app has to do 32bit-64bit? A: Yes, recompile. Wake me up when its 64-128, yaawwn......