Pentium II Klamath 233

Table 6-2: Pentium II Klamath 233 Specifications
Processor Family	Model Name	Intel Pentium II Klamath

	Performance Rating	233 MHz
	Front-side Bus Speed	66 MHz
	Multiplier Ratio	3.5×
Physical Design	Interface Packing	242-Pin Slot 1 Cartridge
	Core Die Size	.28 micron, 203 mm²
	Transistor Count	7.5 Million
	Voltage Interface	Split Core and I/O
	Core Voltage	2.8 volts
	Power Consumption	23 watts
	Maximum Power	34.8 watts

Table 6-3: Pentium II Klamath 233 Overclocking
Pentium II Klamath	Model Rating	233 MHz

Overclocking Potential	Multiplier Lock Support	Unlocked Multiplier
	Typical Multiplier O/C	Up to 4.0×
	Typical Front-side Bus O/C	Up to 75 MHz
	Typical O/C Potential	266 – 300 MHz
	Maximum O/C Potential	300 – 333 MHz
Overclocking Tolerances	Recommended Cooling Type	Forced-Air Heatsink
	Recommended Heatsink Coolers	Globalwin VEK 16
		Vantec PIID-4535H
	Recommended Peltier Active Cooler	STEP-UP-53X2
	Maximum Core Voltage	3.0 volts with Heatsink Cooler
	Maximum I/O Voltage	3.5 volts with Chipset Cooler
	Maximum Core Temperature	72° Celsius

Strategy

The Pentium II 233 is Intel's first entry in the series. As you might expect, overclocking potential for this processor is limited. The majority of the P2 233 chips in circulation are not multiplier locked. The lack of multiplier locking with the P2 233 is helpful, as most of early Slot I motherboards lack support for frontside bus speeds above 66 MHz. Overclocking can therefore be accomplished by changing the clock multiplier alone.

The simplest way to overclock the Pentium II 233 is to increase the core multiplier value from the default of 3.5× to 4.0×, and thus achieve 266 MHz. Higher speeds may be possible with some configurations, but limitations in the 0.5× cache architecture will maximize returns at 337.5 MHz (83-MHz front-side bus × 4.5 multiplier). The external Level 2 cache chips found with the P2 233 often fail at speeds above 166 MHz. Some users may be tempted to disable the L2 cache to reach higher core speeds, but removing this important buffer will result in serious performance losses, outweighing any benefits.