overclock possible?

[tango.charlie]

Hi my PC is about 3 years old now and in real need of a boost so i thought i would give overclocking a try.

Intel E8400
MSI P35 Neo-F
4GB (2x2GB) DDR2 800
ATI HD3870 X2
Hiper Type-M 630W

I understand the E8400 overclocks well but i don't understand how overclocking the CPU affects the other components. Will the rest of my setup be O.K.?

Thanks