The Xeon D-1540 is running 73 watts under load according to anandtech http://www.anandtech.com/show/9185/intel-xeon-d-review-performance-per-watt-server-soc-cha

The Xeon D-1540 is running 73 watts under load according to anandtech http://www.anandtech.com/show/9185/intel-xeon-d-review-performance-per-watt-server-soc-champion/16 http://www.anandtech.com/show/9185/intel-xeon-d-review-perfo... Across all the SKUs in OP the TDP is 35-65 watts. 20 More watts for the new 1587 SKU compared to the benchmarked 1540 in the anandtech article. So a rough estimate would be maybe ~95 watts at under load? Assuming the board is the same and only the CPU has changed that should be a pretty good estimate. You're right it mostly doesn't make sense to compare machines in that way due to all of the variables surrounding colo costs, max load wattage is the metric I should be interested in.