No AMDs are NOT like Pentium 4s. Oh that is a baad comparison. Pentium 4s had horrible temps and huge TPD when IDLE. AMD A-10's have good low watts consumption when Idle, and good low(er than Pentium by a lot) temps when idle.
If you are in a more idle state, then the A-10 can be lower power than the i3. It depends on your other components though. Things that measure TPD measure the entire watts of the computer, not just the watts of the CPU. Meaning the MB harddrive/ssd, fans. And other stuff. They use knowledge of how the power input is measured to estimate out the watts just the CPU is using.. And somesuch, don't remember the exact way some sites use to measure it.
Don't assume it will be at max at all times, unless you are going to use it to max at all times. :/
Otherwise at max i3 have better power usage.
Remember though, that those power levels for the A-10 where achieved when both the CPU and GPU where overclocked and both GPU and CPU were stressed. Standard everyday watt usage isn't as high as the benches can make it go.
n'stuff
I thought this was obvious but Im stating it so it's out there.