There is a copper content in all PCB (printed circuit boards), Gigabyte is telling you, they have 2.0 oz in theirs. You can see the copper in the pads that you insert in to your motherboard pci-e slot.
A printed circuit board, or PCB, is used to mechanically support and electrically connect electronic components using conductive pathways, tracks or signal traces etched from copper sheets laminated onto a non-conductive substrate. It is also referred to as printed wiring board (PWB) or etched wiring board. A PCB populated with electronic components is a printed circuit assembly (PCA), also known as a printed circuit board assembly (PCBA). http://en.wikipedia.org/wiki/Printed_circuit_board
The factory clock speed for the GTX 460 is 675mhz, Gigabyte clocks theirs slightly higher giving it a few % more performance. What you can see with that card that they are not telling you in text is a custom dual fan cooler. Which is also a nice plus. That card seems to be a good value compared to other 1gig cards that are priced at 229.00.