Some details that may help you :
I have linux mint 14 x64 installed on an old PC (AMD Athlon(tm) 64 X2 Dual Core Processor 4000+) with onlu 890 MB of RAM.
It isn't problematic when I only have firefox and one tab opened, but when I want to open multiple tabs or open other software at the same time my slow hard drive is being used since I don't have much RAM.
If have a "GeForce 6100 nForce 405/integrated/SSE2" with 2GO of RAM inside it. I don't play videogames on this PC since it's too old anyway, so is there a way to use it as RAM ? Thanks.