I have a dell dimension 2400 with a 2.4 celeron. I have a pentium 4 3.0GHZ i am installing but i dont what kind of ram that i will need to run my pc. the processor will be sustainable on the motherboard that i am useing along with the chipset i have a Dell 0F5949 motherboard. So what kind of ram should i get? PC2100 or pc2700? I am running PC3200 right now.