Re: Regarding Intel Core 2 Duo and Operating systems
- From: Yousuf Khan <bbbl67@xxxxxxxxx>
- Date: Thu, 20 Mar 2008 12:12:27 -0400
Jens wrote:
Maybe someone here can enlighten me. I got a laptop with a Intel Core
2 Duo T7500 processor 2.2 Ghz.
I've heard it has several cores, and only that it can run a ia64
instruction set.
However i've taken a look at the version of windows that installed and
it doesn't say anywhere
that it's the 64 bit version. It used to be that you needed at special
version of the OS to run another
architecture (like Windows NT for Alpha Workstations).
One thing to note, there is not just one type of 64-bit. The instruction set on Itanium is known as IA64, but the instruction set that runs on PC processors is known as x86-64 (usually shortened to x64, sometimes also known by their commercial brandnames AMD64 or EM64T). IA64 and x64 are not compatible with each other, even though they are both 64-bit instruction sets. English and Swahili are also not compatible with each other, even though they are both human languages.
Anyways, the x64 instruction set is a direct derivation of the 32-bit x86 instruction set, so operating systems designed for x86 work without modification on x64 processors, right out of the box. So usually you will see most manufacturers package the machine with a 32-bit Windows rather than an x64 Windows, even though they can run the 64-bit Windows.
Does that mean that the processor is operating a 32bit compatibility
mode or something?
Am i not getting the full benefit of the processor or is it designed
to run effeciently in 32bit
mode as well?
There is a few features that are not available to you in 32-bit mode that you get in 64-bit mode. It's mostly things like the extra memory addressing, and there are more registers available to programs which should make them faster. But I doubt it'll add to much more than 25% of additional performance.
Yousuf Khan
.
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