HOw to tell max capacity for RAM?

I have a couple of p4 1gb machines. I want to hook them up to screamernet for a make shift renderfarm. My question is how can I tell what is the max capacity of ram I can put in? I have 3 slots and planned on buying 512’s fr each slot but someone said I could mess things up by puttin to high of a capacity of ram in there. Is this true? ANy advice appreciated.

you might also want to get freeram xp, i use that, it displays how much free ram you have :stuck_out_tongue: you can configure it to free you ram when ever you want, but be warned it does also slow you down a little too

OSX has things like that built in.

and your point was? I have a PC (p4)

My point was that you should switch to Apple branded things. :b

Also, third party programs like some of the other people were talking about usually eat up more system resources.