Jeezy is talking about how much he pays for a pound of cocaine. Paying less is a status symbol; it means he's farther up the drug ladder. He used to pay 24 (Kobe Bryant's jersey #) and now he pays 23 (LeBron James). Compare to JayZ in Empire State.
Lil Wayne is comparing his massive amount of chips (meaning money, from poker chips which can be cashed in for money) with the number of chips the giant company Hewlett-Packard has (in their case computer chips).
The full line is: "Chest cold, diamonds make a n*gga wanna cough." Diamonds are colloquially refered to as Ice. He has so many diamonds on his chest that his chest is cold, and chest colds cause caughing.