mac smith :
Hello,
can Intel(R) Pentium(R) 4 CPU 3.00GHz processor support 4 GB of ram
the Answer is more of a sorta/kinda, while the processor couls, your motherboard & it's bios may not, also if you have a 32 bit OS, you will only see 3.2 gb (give or take, depending on your exact system).
As Karmen states, it's not really going to benefit you much.
Jim