Redundant module and systems for high density servers

A server chassis of an electronic rack, comprising:

• one or more electronic devices, representing one or more servers, that generate heat while operating;
• and
• a cooling device, comprising:
• single phase cooling plates attached to the one or more electronic devices, the single phase cooling plates dissipate a majority of the heat from the one or more electronic devices while a first coolant is circulated through the single phase cooling plates;
• and
• a unified cooling plate disposed on top of the single phase cooling plates, the unified cooling plate dissipates a portion of the heat transferred from the single phase cooling plates to the unified cooling plate, the portion of heat dissipated via a second coolant circulated through the unified cooling plate, wherein the second coolant comprises a two phase coolant.

An electronic rack, comprising:

• a plurality of server chassis arranged in a stack, wherein each of the plurality of server chassis comprises:
• one or more electronic devices representing one or more servers, which when operate, generate heat, and
• a cooling device, comprising:
• single phase cooling plates attached to the one or more electronic devices, the single phase cooling plates dissipate a majority of the heat from the one or more electronic devices while a first coolant is circulated through the single phase cooling plates, and
• a unified cooling plate disposed on top of the single phase cooling plates, the unified cooling plate dissipates a portion of the heat transferred from the single phase cooling plates to the unified cooling plate, the portion of heat dissipated via a second coolant circulated through the unified cooling plate, wherein the second coolant comprises a two phase coolant.