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4 Gb is the limit of addressable memory for 32-bit machines. The
amount of usable memory (RAM) is anywhere from around 2-3 Gbyte
depending on hardware configuration. Some hardware (e.g., a graphics
card) reserves memory space for itself, decreasing the amount
available for usable RAM.<br>
<br>
I believe all relatively modern (last 5-10 years?) CPUs are 64-bit
capable. A 64-bit machine should be able to address 16 Gbyte of
memory. (Minus hardware deductions for usuable memory space.)<br>
<br>
Cheers,<br>
<br>
_______________________________________<br>
Roger S. Rowlett<br>
Gordon & Dorothy Kline Professor<br>
Department of Chemistry<br>
Colgate University<br>
13 Oak Drive<br>
Hamilton, NY 13346<br>
<br>
tel: (315)-228-7245<br>
ofc: (315)-228-7395<br>
fax: (315)-228-7935<br>
email: <a class="moz-txt-link-abbreviated" href="mailto:rrowlett@colgate.edu">rrowlett@colgate.edu</a><br>
<br>
<div class="moz-cite-prefix">On 5/14/2014 11:05 AM, Nathaniel Echols
wrote:<br>
</div>
<blockquote
cite="mid:CALeAa1MiGvgvHi2rzj6C9XgfP9BdgqOi1Tq1bLg4M2GQp7m+XA@mail.gmail.com"
type="cite">
<div dir="ltr">On Wed, May 14, 2014 at 1:44 AM, Matteo Colombo <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:Matteo-Maria.Colombo@ibs.fr" target="_blank">Matteo-Maria.Colombo@ibs.fr</a>></span>
wrote:<br>
<div class="gmail_extra">
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"><font
color="#3333ff">My OS is Ubuntu precise 12.04 LTS,
system 32 bit</font></div>
</blockquote>
<div><br>
</div>
<div>One note of caution: if you are running a 32-bit
architecture or OS, upgrading the memory may not help,
because it will be limited in how much it can address at
once. (I forget if the limit is 2GB or 4GB; it may be
OS-dependent.) At this point I would recommend using
64-bit for everything if possible, and especially not
purchasing any systems that are 32-bit only. (Are these
even sold any more?)</div>
<div><br>
</div>
<div>-Nat</div>
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