"Mem" refers to your board version, newest one is 6, and I'm pretty sure it's the only one that COPS2 compatible. COPS is WDP's paint detection system. It's acutally quite different than the eye on the impulse, as it uses a rod in the breach to put pressure on a sensor pad in the gripframe, but for the sake of argument, they both detect paint and prevent chops. LCD's don't have COPS, not even the 2k3's.