HP and Dell, among other workstation manufacturers, have been shipping their systems with the function turned off. Right now, workstation makers say, the broad array of software used in that segment of the market doesn’t take advantage of the technology yet. Users, though, can easily turn on the hyperthreading function if they wish (in the BIOS). Although the situation will change, the wrinkle in the workstation market–where Intel said users could see performance benefits of up to 30 percent on select applications–underscores the difficulties in gaining broad acceptance and use for a new technology. Only 30 apps had been fully optimized for the Pentium4 CPU in the first 9 months the chip was on sale.