Is it a big performace hit from cas2 to cas2.5 on an nForce2 MoB? I probably will Not OClock. I have a 2100XP+ cpu, and in a year or so I'll upgrade to the highest processor the board can take. I understand that It's best to install two sticks of the same sdram. If so then why? The cas2 is very expensive. I thought that I could go with PC2100 cas2.5, then when I upgrade to a 333fsb processor I would get a higher grade of memory. I have about $150 for memory and I just don't know what to do. I sure could use some help.