[ubuntu-us-nm] Building own system and 64-bit
joseph at pfeifferfamily.net
Mon Apr 21 15:30:51 BST 2008
Some answers but not all:
Andrew Parker writes:
>Now the 64-bit questions.
> 1. Do I gain any advantage getting a 64-bit processor if Windows XP
> (in a VM) runs on 32-bit, other than upgradability?
No. If you're running 32-bit, having a 64-bit processor makes no
> 2. The processors that I am looking at say they support 64-bit.
> But are they really 64-bit? For example, are the Intel Core 2
> Quad, Core 2 Duo and the Dual Core all 64-bit? I do not think
Yes. Everything Intel calls "Core 2" is 64-bit. I'm not sure about
"Dual Core"; if you mean "Pentium Dual Core", the answer is yes for
that as well. See
> 3. If I get a 64-bit chip, can I run a 32-bit Ubuntu?
Yes. My wife has a 64-bit AMD laptop, which we run 32-bit Debian on.
> 4. But, if I run 64-bit Ubuntu can I run software built for 32-bit?
> Looking at the Grass website, there is a AMD64 version and an
> I386. Does the AMD64 apply to Intel 64-bit too? And the I386
> the 32-bit version?
Yes, though here you're reaching the limits of what I know about.
Apparently you can run a 32-bit kernel and 64-bit applications, or the
other way around, but it involves some sort of magic with putting the
right libraries in the right places. Haven't tried it...
> 5. What about VMware. If I run 64-bit Ubuntu, 64-bit Vmware, can I
> run my 32-bit Windows XP? And, if I run the 64-bit VWmware, can
> I transfer my existing VM running on a 32-bit Ubuntu to the
> 64-bit VMware Version?
> 6. If I go with a 64-bit processor and a 32-bit Ubuntu, will I be
> able to utilize 8GB of RAM?
Assuming Ubuntu's kernel is compiled with HIGHMEM enabled (which I
would guess to be a pretty safe assumption), yes.
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