Jwoolington :
migronesien :
The one without the "P" is a bit faster.
P4600 = 350Mhz clock
4600 = 400Mhz clock
Intel site says they are both 350MHz
Just looked it up. It depends in which CPU the chip will be. It's 200-400Mhz base clock depending on the CPU model upto 1350Mhz boost.
So depending on the CPU there may be no difference, if both are clocked the same.