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If you we're running them on 100% load there would be about a 30W difference which is 720W Extra a Day.
About 5-6p difference a day dependant on how you a kw/h costs you and assuming it will be on full load which i doubt.
You may also want to take into consideration the extra fan wattage to cool the Q6600 and the noise it will add.
My Everest ultimate (lastest build) doesn't have the GPU A or CPU wattage ratingsAny ideas?