xSeries range
IBM eServer xSeries 100, 130, 135, 150
IBM eServer xSeries 200, 205, 206, 206m, 220, 225, 226, 230, 232, 235, 236, 240, 250, 255, 260
IBM eServer xSeries 300, 305, 306, 306m, 330, 335, 336, 340, 342, 345, 346, 350, 360, 365, 366, 370, 380, 382
IBM eServer xSeries 440, 445, 450, 455, 460
Numbering scheme
100 series are entry-level tower servers
200 series are tower servers
300 series are rack-mount servers
400 series are rack-mount scalable servers