Sierra Madre Chip

 is a miscellaneous item in the Fallout: New Vegas add-on Dead Money.

Use
They can be used to purchase items (mostly food items, but chem requisites can be found in the clinic) from Sierra Madre vending machines.

Can also be used in the Casino to gamble.

The chips can be exchanged into Pre-War money in the Casino, at a rate of one chip to one Pre-War money (a value of 10 caps). As the PC can earn 12000 chips before getting banned, one can earn a very large number of caps with this method.

Location
These little chips are found all throughout the Sierra Madre. - in The Villa, many can be found in fountains, whereas in the Sierra Madre Casino, many can be found in cupboards, suitcases etc, most notably, 303 can be found in a suitcase in a room on the Suites level of the casino.