IBM HANDBOOK 260 - Manual (Page 20)

2 RS/6000 43P 7043 Models 150 and 260 Handbook
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Figure 1. RS/6000 PCI Workstation/Server Family
The RS/6000 naming convention is patterned similarly to many of IBM’s
product lines. A product is represented as a four digit machine code followed
by a model number. A unique machine code is assigned to each series of
machines that fit together using similar designs or customer solutions. The
first character of the model number groups machines with a specific
enclosure together, and the remaining digits are typically used to indicate
performance within similar models. This convention is not without variations.
However, with this in mind, you can determine that the Models 140 and 150
are related, with the 150 being more powerful. This is also valid for the
Models 240 and 260.