Could you please help me the RAM required to configure for FEDORA 8 Linux?
I think installing Fedora 8 would generally be a bad idea. Security update support for Fedora 8 ended more than 6 months ago. Thus, either you need to apply security-relevant patches yourself or be stuck with a vulnerable system.
Moreover, if you have enough RAM for Fedora 8, you likely have enough RAM for Fedora 9 or 10 as well.