Aptix GP4 is a programmable circuit board. This means that the routing between circuits (eg. FPGA's) on the board is handled automatically by programming four interconnect circuits (FPIC's) residing on the board. These interconnect circuits utilize predrawn wires inside the board (which has 10 layers) to make connections between the design circuits (the FPGA's). The interconnection is specified by the designer on a ViewDraw schematic which is then loaded into Axess (the program used to route the FPIC's on the programmable circuit board). After making a virtual routing internally, Axess dumps the routing information to the FPIC's which then makes physical interconnections on the board, connecting all specified circuits.

The GP4 can handle clock speeds up to 30 MHz with a fanout of 1, 15-20 MHz for a fanout of 5. Higher fanouts reduce the speed.

With this type of interconnection system the designer can postphone the layout and routing of the (to be manufactured) circuit board until the whole system has been proven to work correctly. Aptix claims that the time to market can be halved by using this board in the design process.