(Investor's Business Daily) For years, the ranking of the largest makers of memory chips has held steady. South Korea's Samsung Group is No. 1. Micron Technologies Inc. of Boise, Idaho, is No. 2. And Germany's Infineon Technologies AG meanders in at No. 3. But thanks to Infineon, suddenly there's some sizzle in the staid memory chip world. Infineon set a brisk first-quarter pace, gaining share on its main rivals. The company's share of the DRAM memory chip market jumped 4.2%, an unusually high percentage rise for one quarter, says tracker iSuppli Corp. The company sold $613 million in DRAMs, the most common type of memory chip.