It depends on the application/duty, but maximum/rated power is not usually relevant for power consumption on home servers like this - they’re rarely running at mother than a few percent load.

Idle power consumption is the main concern. Server boards often have a lot of NICs and chipsets that don’t idle well. Consumer gear is generally much better for that.

Neither Westmere nor the AM3 platform are known for low power consumption. A modern LGA1150 or later desktop platform would probably be preferable.