Power can be two things.1: performance:
Clock-per-clock, I believe a celeron core is faster. However, the Atom is a dual core. That will make it more powerful for most tasks.
Here's a benchmark of a single core
atom vs a single core
celeron. Note that you are comparing a dual core atom to a single core celeron:http://www.anandtech.com/show/2537/7
Based on this, I have changed my mind. It appears that clock-per-clock, the atom is so terrible next to the celeron, that the single core celeron is better.http://www.tomshardware.com/reviews/intel-atom-cpu,1947-9.html2: power consumption:http://ark.intel.com/Product.aspx?id=43098http://ark.intel.com/Product.aspx?id=29734
13W TDP atom vs 35W TDP celeron. The atom has lower power consumption.