mmoy said:
Pentium 4s and Pentium Ds have EM64T. Pentium Ms do not yet. Sometime in the second half of the year according to the current schedule.
From what i have read EM64T are not 64Bit Cpu's but are capable of running on Windows x64 ????
I dont get it!?
"Intel produces no consumer 64 bit chips.
The Prescott "J" model with the EMT64 designator is a Pentium 4 chip. Like
all other P4 chips, it is 32 bit. The EMT64 stands for Extended Memory
Technology, and allows the processor to use the x64 core coding to address
more than 4GB of RAM. It will emulate running the 64 bit code in Windows Xp
x64, but will run it in 32 bit mode only."
"the EMT64 chips are still 32 bit
chips. Intel will not have any 64 bit consumer chips until next year
(hopefully). EMT64 (Extended Memory Technology 64) chips allow a P4 chip to
use the same registers that a 64 bit chip accesses, so that they can use
more than the 4GB that a non-EMT64 P4 can access. As a side advantage of
this, the chip can "execute" the x86 code, but it does so through emulation
using a 32 bit thunking layer. It does not run the 64 bit OS as a 64 bit
OS, but as a thunked OS. This is slow and clumsy at best. The point I am
trying to make is that the EMT64 bit chips *ARE NOT* 64 bit chips. They are
able to use certain functions of the x86 extensions that allow it to access
the same registers, but that is all. It is *NOT* a 64 bit chip, not will it
ever be. Intel has announced that it *WILL* produce 64 bit chips next year.
I want those who are considering buying a 64 bit computer to understand that
while the EMT64 can emulate execution of the code, it is *NOT* a 64 bit
chip. Never was, never will be."
So in short i would of liked it much better if Apple went with AMD their CPU line up now (AMDs) is far advanced over Intel.