The GX5961 has 7 connectors on the front (Power, IO, Analog I/O, High Voltage, Probe, Probe Power, and Auxiliary) and 3 PXI connectors on the rear of the module.
GX5961 Board
The GX5964 has 3 connectors (Power, I/O and Analog I/O) on the front and 3 PXI connectors on the rear of the module.
GX5964 Board
The GX5964A has 4 connectors (Power, 2 I/O and Analog I/O) on the front and 3 PXI connectors on the rear of the module.
GX5964A Board