p-iiis

recently i hired 3 PCs 4 work,the vendor was spposed 2 give me 1 P-IV and 2 P-IIIs,wen i chekd the P-IIIs had clok speeds 450 and 500 mhz,and he gave me an AMD 1.1Ghz instead of P-IV,he sayz its the same as p-IV.is he rite? also one of the P-IIIs shows P-II 500Mhz,MMx processor in the bios,y...