Cooling plate and data processing system provided with cooling plates

A data processing system provided with cooling plates which use a coolant to cool heat generating devices mounted on a board on which data processing circuits are formed, each said cooling plate comprising

• a main body provided with an upper space and a lower space separated by a separating wall and having a bottom surface placed on a heat generating member,
• a partition wall provided sticking out at said upper space side of said separating wall and partitioning the inside of said upper space into a first channel through which the coolant before absorbing heat flows and a second channel through which said coolant after absorbing heat of said heat generating member flows,
• a plurality of through holes provided in said separating wall for running said coolant in said first channel into said lower space and running said coolant in said lower space into said second channel, and
• a third channel provided in said partition wall and running part of said coolant before absorbing heat.