MCBastos wrote:
Interviewed by CNN on 23/04/2011 02:57, Rufus told the world:
I found a Terminal command line to change my 'Book and now it boots 64
bit by default. It felt snappier at first, but now that it's settling
in I'm not really sure what all the fuss is about...or maybe I've just
gotten used to it - I'm thinking that all I'm really getting is more
efficient use of RAM?. Haven't encountered an installed app that won't
run as of yet...which I guess I shouldn't expect to?
Well, it's not so much "more efficient use of RAM" but "capable of using
more RAM." The Intel 32-bit architecture cannot address more than 4 Gb
directly. There are indirect methods to do so, but they are a bit
tricky. I don't know how Apple managed the issue, but in the Windows
world at least, Microsoft opted to not allow consumer-level machines and
low-end servers (which, back in the days before AMD64 and E64T
extensions, didn't even have enough sockets for more than 4Gb anyway) to
use those indirect methods.
Rule of the thumb: if you have less than 4Gb of RAM, 64-bit mode won't
make much of a difference. If you have 4Gb, depending on a number of
factors, you may see some more free RAM. If you have more than 4Gb, you
probably should be using 64-bit mode.
My MacBook Pro, has 8 GB DDR3 1067MHz Memory.
--
Phillip M. Jones, C.E.T. "If it's Fixed, Don't Break it"
http://www.phillipmjones.net mailto:[email protected]
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