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compare-processors.com/a ··· 0m/5607/A8-4500M will win hands down. More cores(2 more cores than A6.), more cache memory(another 3MB L2 cache), same watt usage, Has a better graphics HD7640G.
You will say "but it has more Frequency". In this case. Cache plays a major role. Making the A8-4500M faster than A6-4400M