I searched for info about this but I couldn’t find.
I have the following setup:
Dell Dimension 5150 (Pentium D @ 2.8 GHz with EM64T) running Ubuntu (32bit).
Inside Ubuntu, I am running VMware Server with Windows Server 2003.
We got a new computer that is a bit better (Dell Dimension E520 – Pentium D @ 3 GHz, cache is twice the size, faster memory, etc, and also EM64T).
I was planning to install Ubuntu on the new system, and moving the virtual machine.
When I was comparing both system’s specs, I realized they both have EM64T. I didn’t know that.
Then I realized I am running 32 bit OSs (both Ubuntu and Windows Server) on 64 bit capable systems.
As far as I know, EM64T is an extension to the x86 instructions set… so the processor wouldn’t be emulating 32bit mode, right?
So the question is, is it worth it reinstalling everything?
Is a system slower because of running a 32 bit OS, or just not taking advantage of the larger memory addressability (which I won’t use soon)?
Or am I missing some other feature of EM64T?
What if I install 64bit Ubuntu and keep running 32bit virtual machine?
I also realized that I have a few systems like this one running 32bit Windows XP. The same question…
What would you do?
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