Editing Pentium II (section)

==={{Anchor|Klamath}}Klamath===
The original ''Klamath'' Pentium II microprocessor (Intel product code 80522) ran at 233, 266, and 300&nbsp;[[Megahertz|MHz]] and was produced in a 0.35 [[micrometre|μm]] process.<ref name=TomsPIIKlamath /><ref name=sandpileP2>[http://sandpile.org/impl/p2.htm IA-32 implementation Intel P2 (incl. Celeron and Xeon)] {{webarchive|url=https://archive.today/20070927222115/http://sandpile.org/impl/p2.htm |date=2007-09-27 }}, SandPile.org, accessed May 5, 2007.</ref> The 300&nbsp;MHz version, however, only became available in large quantities later in 1997.<ref name=sandpileP2 /> These CPUs had a 66&nbsp;MHz [[front-side bus]] and were initially used on motherboards equipped with the aging [[List of Intel chipsets#Pentium Pro/II/III chipsets|Intel 440FX]] ''Natoma'' chipset designed for the Pentium Pro.<ref>[http://www.pcguide.com/ref/mbsys/chip/pop/g6I440FX-c.html Intel 440FX], PCGuide, accessed May 5, 2007.</ref> Pentium II-based systems using the [[List of Intel chipsets|Intel 440LX]] ''Balboa'' chipset widely popularized [[SDRAM]] (which was to replace [[Dynamic random access memory|EDO RAM]] and was already introduced with 430VX), and the [[Accelerated Graphics Port|AGP]] graphics bus.<ref>[http://www.pcguide.com/ref/mbsys/chip/pop/g6I440LX-c.html Intel 440LX], PCGuide, accessed May 5, 2007.</ref>

On July 14, 1997, Intel announced a version of the Pentium II ''Klamath'' with 2× 72-bit ECC L2 cache for entry-level servers, as opposed to the 2× 64-bit non-ECC L2 cache on regular models.<ref>[http://www.intel.com/pressroom/archive/releases/1997/SP071497.HTM], Intel, accessed February 4, 2017.</ref> The extra bits give it error-correction capability built into hardware, without impacting performance. The variant can be determined through the CPU part number.

In Intel's "Family/Model/Stepping" scheme, Klamath CPUs are family 6, model 3.