A few additional points:
SSL TPS, or Transactions Per Second, is the initial (or renegotiated) SSL handshake process and key exchange. It happens once at the beginning of an SSL session and potentially again at renegotiation points. This is different than "bulk" encryption, which 1) generally uses smaller keys, and 2) has MUCH greater capacity than TPS. The TPS number is not necessarily equal to the total number of connections, unless all of those connections start at the same time.
Also, SSL certificates and keys are loaded into running memory so the practical limitation is the hardware's capacity. The smallest BIG-IP platform can handle thousands of certificate/key pairs.