The chipmaker, in a regularly scheduled price adjustment, followed the introduction of higher-performance Opteron server chips with cuts of up to 35 percent on existing Opterons. AMD also lowered the prices of its Athlon 64 chips for desktop and notebook PCs by as much as 34 percent and cut its Sempron value chips by between 6 percent and 19 percent. But in a twist, it also slightly raised the prices on a handful of processors, including a pair of Athlon MP server chips and a Sempron for desktop PCs.