Can someone explain this?

I have two GPUs I was using furmark to stress HD 3000 and i came up with this activity. Furmark kept jumping from 6-12-6-12 etc fps. Is this reasonable at all? Temp was 61-61C.This does not happen always sometimes it will be at 90% constantly. When i stress 525m together then the 525m starts making something like big pauses sometimes being at 55% sometimes at 85% while the HD 3000 being at 90% constantly. When i stress CPU at the same time too then 525m drops to `33% constant. 525m never throttles on my machine no matter what the temps so its not a throttling problem. Sometimes when i game using 525m the CPU will throttle to 0.9 Ghz with temps being below 70 which is unusual.

Sometimes not always when i charge the battery i get a message your power supply does not give enough watt or is not appropriate (dell) purchase a correct one.

Do i have a faulty brick? Its 90W. How do i prove that to the service guy?
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First get a power meter and make sure the adapter is drawing the full 90 watts, also try removing the battery while stressing the computer so no power is redirected to charging the battery.