Demand for mainframe and high-performance Unix servers is falling, but a new wave of Sparc and IBM Power chips for the servers will be unwrapped at the Hot Chips conference in late August. IBM, Oracle, and Fujitsu -- the main suppliers of Unix server chips -- will talk about their next-generation RISC (Reduced Instruction Set Computer) chips at the conference, which will be held Stanford University from Aug. 25 to 28. The chips typically go into high-availability servers, which are falling out of favor to the inexpensive and flexible x86 servers.