Ok, I have what may be a stupid question, but I've googled around and couldn't find an answer to this, so I figured I'd ask here.
First off, here's my general system specs:
Pentium D CPU 2.80 GHz, 2.79 GHz
3.50 GB RAM
Windows XP 32-Bit
Anyway, I used to have just 1 GB RAM, but for XMas upgraded to 4GB (2x2GB RAM cards/sticks/whatever they might be called). Now, I know all about the problem with 32-Bit OS's which is why my RAM's capped at 3.5, so that's not what my question is about.
My question is, when running Photoshop and going into the memory usage settings in Preferences it says that 1777 MB of RAM is available. So, that's almost 2 GB. Why is the other 1.5 GB I supposedly have access to not available in Photoshop?
Actually, since I'm here I might as well ask another question. I upgraded the RAM with the intention of eventually getting a 64-Bit OS which would give me access to more RAM, and then upgrading PS to CS4. Is that even worth it, or should I just wait until I can afford a whole new rig? I ask, because I read conflicting things online as to whether or not the Pentium D CPU and chipset is even true 64-Bit and might be slowed down by a 64-Bit OS.
Thanks for any insight.