Saw this great article about using the RAM that windows XP can't. By nature, the 32 bit OS is limited to ~2.5GB of RAM, so if you have 4GB (or more than 2.5) installed, it's not being used.
RAMShop allows you to allocate that unused RAM as a RAM disk and let photoshop use it as the swap disk. Much faster than traditional HD!
Took a bit of finessing for me to get this running, the software he mentions didn't play nice at first with my copy of XP. Feels like running the Photoshop scratch disk off a SSD though once it gets going!
Hmm... does this happen in Vista? I didn't check this out yet. I also have 8GB of ram. I know Mudbox 2009 can use all of it... heh... or does CS4 work differently? Using ram more than hdd?
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So if this works that may be very cool.
[edit] Actually this would probabbly be a bad idea to do on a 64 bit os, as it would keep that % of ram from other programs that may need it.
What? I thought we were just talking about a 32-bit restriction here?
A 32-bit XP (or vista) system with 4GB will read as 2.5-3.5GB of ram once you're booted up.
http://www.acropdf.com/
check out the bottom page.