Method for testing synchronization and connection status of a graphics processing unit module

A computer readable medium containing a program which, when executed, performs an operation, comprising:

• detecting whether an incoming synchronization signal has been received;
• determining whether the incoming synchronization signal is received from one of the first graphics processing unit, the second graphics processing unit and an external synchronization signal;
• and
• indicating on a control panel one of a first and second synchronization input/output ports on one of the first graphics processing unit and the second graphics processing unit as an input port and the other one of the first and second synchronization input/output ports as an output port, if the incoming synchronization signal is received from the one of the first graphics processing unit and the second graphics processing unit.

An apparatus for testing synchronization between a first graphics processing unit coupled to a second graphics processing unit, comprising:

• means for detecting whether an incoming synchronization signal has been received;
• means for determining whether the incoming synchronization signal is received from one of the first graphics processing unit, the second graphics processing unit and an external synchronization signal;
• and
• means for indicating on a control panel one of a first and second synchronization input/output ports on one of the first graphics processing unit and the second graphics processing unit as an input port and the other one of the first and second synchronization input/output ports as an output port, if the incoming synchronization signal is received from the one of the first graphics processing unit and the second graphics processing unit.