The math coprocessor business rapidly increased starting in 1984 with software products that accelerated applications like Lotus 123. At the same time the advent of the 80286 based IBM-AT with its 80287 math coprocessor provided new opportunities for companies that had grown up selling 8087s and supporting software. This included products like Hauppage's "287 Fast/5," a product that took advantage of the 80287's design that used an asynchronous clock to drive its FPU at 5 MHz instead of the 4 MHz clocking provided by IBM, making it possible for the 80287s that came with the AT to be overclocked to 12 MHz.