Amd athlon x4 840 38ghz socket fm2 4mb cache reatail boxed processor amd athlon x4 840 specifications general information type cpu microprocessor market segment desktop family amd athlon x4 model number 840 frequency 3100 mhz turbo frequency 3800 mhz package 906 pin lidded micro pga package socket socket fm2 size 157 x 157 4cm x 4cm architecture microarchitecture microarchitecture steamroller processor core kaveri core stepping kv a1 cpuid