SONAR4 on Windows XP 64bit

Has anyone run the production version of SONAR4 on Windows XP 64 bit edition? Since SONAR4 is a 32 bit program, it would run thru the WOW64 translation layer, but should run OK... I think. I'm wondering if the WOW64 layer causes a significant slow down in general, and specifically, a higher mixing latency. I am expecting that 44kHz mixing with ASIO or WDM drivers, would normally provide a latency of less than 4 milliseconds on Windows XP (32 bit). It's kind of "leading edge", but they are selling XP64 now, and somebody out there must have tried.

I've personally found that 32 bit programs actually seem to run slightly better in WInX64. I'm assuming that it's because the OS is making proper use of my processor (AMD athlon64) and the simple fact that my windows x64 partition is empty apart from soundforge and sonar.

But whatever the cause, I'm certain that nothing actually runs slower.