Think that only Netkas can help understand this...
My rig is an almost perfect Dell Optiplex 755 with USB (creative xmod) sound, ASUS nVidia 7300GS, 3com 3c509nic 'cause the integrated Intel 82566 is still unsupported. EFI8 allows the bootstrap of a fine-tuned GUID disk with vanilla kernel.
The processor is an Allendale T4400 correctly recognized as "Core2 Duo".
Pls. note that I also own a REAL iMac 24 featuring a T7300 processor. My Hackintosh and my Macintosh work the same with any application. Or at least I thougth, before trying to install Vista 64 on a Virtual Machine (with both Parallels and VmWare Fusion 1.1.1).
Here the two machines had a dramatic difference of performance.
My REAL iMac allows to bootstrap and install VISTA64. When I try the same with the vanilla EFI8 Hackintosh, VISTA64 doesn't start because the emulator (VmWare or Parallels, don't care) doesn't see the 64 bits capability.
Pls note that Vista64 can be installed (and actually installs) natively on the same T4400-based machine (Optiplex 755). Thus it's not a matter of the processor.
How can I get 64 bit support on my Hackintosh ?
Thankz in advance