Amd athlon x4 870k 41 ghz socket fm2 4mb cache retail boxed processor amd athlon x4 870k specifications general information type cpu microprocessor market segment desktop family amd athlon x4 model number 870k cpu part number ad870kxbjcsbx is a boxed microprocessor with low noise fan and heatsink frequency 3900 mhz turbo frequency 4100 mhz package 906 pin lidded micro pga package socket socket fm2 size 157 x 157 4cm x 4cm architecture microarchitecture micr