Pricing 150, 000 equity options in a second or assessing how much crude oil sits in a pocket 6 miles below the earth's surface are massively parallel mathematical computing problems for which graphics processors are peculiarly equipped.
Fusion blends (fuses) traditional x86 computing cores, which compute things serially or one after the other, with graphics processors, which compute them in parallel or all at the same time.
Early in my career I worked at a company called MasPar which relied on thousands of processors to conduct massive amounts of coordinated computations in parallel.