Crucial is designing RAM that includes heatsinks built to the types of heatsinks used on Apple-included RAM for silent operation. Stop spreading FUD about non-two-pound-heatsink'd RAM "overheating"; if it overheated, they wouldn't sell it.
It's just designed to not break the Apple-provided luxury of slow fan speeds; third party RAM without gigantic heatsinks will work just fine, but your system will say "hey, it's getting hot in here" and crank the fans up a notch to compensate, but no burning silicon should result.