List of Intel Pentium III processors
The Pentium III from Intel is a sixth-generation CPU targeted at the consumer market. == Desktop processors == === "Katmai" (250 nm) === 9.5 million transistors All models support: MMX, SSE The 'B' suffix denotes a 133 MHz FSB The '80525PYxxx512' number denotes an OEM CPU while the 'BX80525xxxx512' or 'BX80525xxxx512E' number denotes a boxed CPU The L2 cache is off-die and runs at 50% CPU speed.
Source: Wikipedia — List of Intel Pentium III processors (CC BY-SA 4.0)