I doubt that identifying your system differently could physically effect your hardware.
Perhaps I wasn't clear. I did not misidentify my machine. I modified my MacPro4_1.plist as per d00ds instructions on page 1. It had a substantial effect on my performance. Why? I'm not sure. As a result, I'm using the vanilla version of IOPlatformPluginFamily that gets installed with Mac Pro Audio Update.
I guess what I'm trying to say is that maybe we don't need that MacPro4_1.plist mod after installing that update. It's possible that people have updated and didn't realize that kext got changed in the first place.