AMD, Intel unwrap their latest server chips
 

Tulsa sports a thermal design power (or thermal ceiling) of 150 watts. That's lower than Paxville, which comes with a 165-watt TDP. Chips usually don't hit their thermal ceilings, but server manufacturers have to compensate for it in their designs. A high thermal ceiling can also translate to a high average power consumption.

By contrast, the Pacifica chip coming from AMD has a 95-watt thermal ceiling and will come with AMD's own virtualization technology, according to the company.