EXPreview.com website has published detailed pics of EVGA GTX 275 CO-OP PhysX – card with exceptional design, which combines two different GPU,  G200 (GTX 275) and G92 (GTS 250), on one PCB.

55nm GT200b graphics-rendering chip (left one on a pic below) operates at a 633MHz core, 1296MHz shaders and has 896MB of GDDR3 memory, running at 2268MHz. 55nm G92b chip (right one), fully dedicated to PhysX processing,  runs at a 738MHz core, 1836MHz shaders, and has 384MB of 2200MHz GDDR3 memory.

Cooling system consist of two heatsinks with heatpipes, fan in the middle.

Source: EXPreview.com