E5200 to Core 2 Duo E6420: WEI drop

Hello. I just replaced my E5200 dual core (2.5GHz) with a C2Duo E6420 (2.13GHz). My WEI dropped from 6.0 to 5.4 for the CPU, and from 6.0 to 5.3 for the RAM (4GB). I was under the impression that the core 2 duo was superior to the dual core. Am I wrong?

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