Table 6-43: Pentium III Katmai Specifications
Processor Family Model Name Intel Pentium III Katmai
Performance Rating 600 MHz
Generation Sixth: 80686 IA-32
Operational Rates Level 1 Cache Speed 1.0× Core Rate
Level 2 Cache Speed 0.5× Core Rate
Front-side Bus Speed 100 – 133 MHz
Multiplier Ratio 4.5× – 6.0×
Physical Design Interface Packing 242-Pin Slot 1 Cartridge
Core Die Size .25 micron, 128mm2
Transistor Count ~ 9.5 Million
Voltage Interface Split Core and I/O
Core Voltage 2.00 − 2.05 volts
Table 6-43: Pentium III Katmai Specifications
Processor Family Model Name Intel Pentium III Katmai
I/O Voltage 3.3 volts
OOO and Speculative Execution RISC
Maximum Execution Rate 5 Micro-Ops per Cycle
Data Bus Width 64 bit
Maximum Memory
Support Physical = 64 Gigabyte
Virtual = 64 Terabyte
Multi-Processor Support 2-way SMP via APIC Level 1 Code Cache 16 KB 4-way
Static Branch Prediction Supported
Dynamic Branch
Prediction 512 Entry 4-way
RSB Branch Prediction 4 Entry
Floating-Point Processor Integrated
Multimedia Extensions MMX, SSE
Pentium III Katmai 450
Table 6-44: Pentium III Katmai 450 Specifications
Processor Family Model Name Intel Pentium III Katmai
Performance Rating 450 MHz
Front-side Bus Speed 100 MHz
Table 6-44: Pentium III Katmai 450 Specifications
Processor Family Model Name Intel Pentium III Katmai
Multiplier Ratio 4.5×
Physical Design Interface Packing 242-Pin Slot 1 Cartridge
Core Voltage 2.0 volts
Power Consumption 17 watts
Maximum Power 25.3 watts
Table 6-45: Pentium III Katmai 450 Overclocking Pentium III Katmai Model Rating 450 MHz
Overclocking Potential Multiplier Lock Support Locked Multiplier
Typical Multiplier O/C N/A
Typical Front-side Bus O/C Up to 112 – 124 MHz
Typical O/C Potential 504 – 558 MHz
Maximum O/C Potential 600+ MHz
Overclocking
Tolerances Recommended Cooling Type Forced-Air Heatsink
Recommended Heatsink Coolers Globalwin VES20
Alpha P3125
Recommended Peltier Active
Cooler Swiftech MC1000
PC-10a Cooler
Maximum Core Voltage
2.2 volts with Heatsink Cooler
Maximum I/O Voltage
3.5 volts with Chipset Cooler
Maximum Core Temperature 80 – 85° Celsius
Strategy
The Katmai 450 MHz introduced the new Pentium III core. This chip is solid for overclocking due to its highly refined .25-micron core, coupled with a low 4.5×
multiplier and 100-MHz front-side bus support. The Katmai shares many attributes with its Pentium II sibling, though the higher-quality cache memory chips allow the Katmai 450 to scale up to 600 MHz efficiently, given sufficient cooling.
The 4.5× multiplier is well suited for 124-MHz front-side bus overclocking, yielding a respectable 558 MHz. A small number of these chips will reach 600 MHz with quality cooling, but be prepared to bump the core voltage to 2.2 volts for stability. The
Katmai does demand power; alternative cooling methods based on Peltier or liquid technologies are desirable.
Pentium III Katmai 500
Table 6-46: Pentium III Katmai 500 Specifications
Processor Family Model Name Intel Pentium III Katmai
Performance Rating 500 MHz
Front-side Bus Speed 100 MHz
Multiplier Ratio 5.0×
Physical Design Interface Packing 242-Pin Slot 1 Cartridge
Core Voltage 2.0 voltage
Power Consumption 19 watts
Maximum Power 28 watts
Table 6-47: Pentium III Katmai 500 Overclocking Pentium III Katmai Model Rating 500 MHz
Overclocking Potential Multiplier Lock Support Locked Multiplier
Typical Multiplier O/C N/A
Typical Front-side Bus O/C Up to 112 – 124 MHz
Typical O/C Potential 560 – 600 MHz
Maximum O/C Potential 600+ MHz
Overclocking
Tolerances Recommended Cooling Type Forced-Air Heatsink
Recommended Heatsink Coolers Globalwin VES20
Alpha P3125
Recommended Peltier Active
Cooler Swiftech MC1000
PC-10a Cooler
Maximum Core Voltage2.2 volts with Heatsink
Cooler
Maximum I/O Voltage3.5 volts with Chipset
Cooler
Maximum Core Temperature 80 – 85° Celsius
Strategy
Overclocking the Pentium III Katmai 500 MHz works best with the 112-MHz front-side bus rate. Unlike the Katmai 450, this model is not suitable for 133-MHz bus
overclocking due to its higher 5.0× internal multiplier. Most Katmai 500 processors will reach maximum overclocking potential around 600 MHz, though many units will never see returns beyond the 560-MHz level.
Pentium III Katmai 550
Table 6-48: Pentium III Katmai 550 Specifications
Processor Family Model Name Intel Pentium III Katmai
Performance Rating 550 MHz
Front-side Bus Speed 100 MHz
Multiplier Ratio 5.5×
Core Voltage 2.0 volts
Power Consumption 21 watts
Maximum Power 30.8 watts
Table 6-49: Pentium III Katmai 550 Overclocking Pentium III Katmai Model Rating 550 MHz
Overclocking Potential Multiplier Lock Support Locked Multiplier
Typical Multiplier O/C N/A
Typical Front-side Bus O/C Up to 112 MHz
Typical O/C Potential 575 – 616 MHz
Maximum O/C Potential ~ 650 MHz
Overclocking
Tolerances Recommended Cooling Type Forced-Air Heatsink
Recommended Heatsink Coolers Globalwin VES20
Alpha P3125
Recommended Peltier Active
Cooler Swiftech MC1000
PC-10a Cooler
Maximum Core Voltage
2.2 volts with Heatsink Cooler
Maximum I/O Voltage
3.5 volts with Chipset Cooler
Maximum Core Temperature 80 – 85° Celsius
Strategy
The Katmai 550-MHz processor also offers minimal overclocking potential due to its 5.5× internal multiplier. Most Katmai 550 models will reach their maximum
overclocking rate around 575 MHz, just beyond the default core rate of this chip.
Accordingly, the retail Intel heatsink cooler should prove adequate for overclocking this processor.
Pentium III Katmai 600
Table 6-50: Pentium III Katmai 600 Specifications
Processor Family Model Name Intel Pentium III Katmai
Performance Rating 600 MHz
Front-side Bus Speed 100 MHz
Multiplier Ratio 6.0×
Physical Design Interface Packing 242-Pin Slot 1 Cartridge
Core Voltage 2.0 volts
Power Consumption 23 watts
Maximum Power 34.5 watts
Table 6-51: Pentium III Katmai 600 Overclocking Pentium III Katmai Model Rating 600 MHz
Overclocking Potential Multiplier Lock Support Locked Multiplier
Typical Multiplier O/C N/A
Typical Front-side Bus O/C 105 – 112 MHz
Typical O/C Potential 630 – 672 MHz
Maximum O/C Potential ~ 700 MHz
Overclocking
Tolerances Recommended Cooling Type Forced-Air Heatsink
Recommended Heatsink Coolers Globalwin VES20
Alpha P3125
Recommended Peltier Active
Cooler Swiftech MC1000
PC-10a Cooler
Maximum Core Voltage
2.2 volts with Heatsink Cooler
Maximum I/O Voltage
3.5 volts with Chipset Cooler
Maximum Core Temperature 80 – 85° Celsius
Strategy
The Pentium III 600 brought an end to the 100-MHz front-side-bus-compatible Katmai series of processors. The final model in this series, the Katmai 600, lacks
overclocking potential beyond the 112-MHz front-side bus rate, leading to a
theoretical maximum near 672 MHz. Earlier Katmai models offer better performance;
lower ranges of the Katmai series can often overclock to a speedier 133-MHz front-side bus rate.
Pentium III Katmai 533B
Table 6-52: Pentium III Katmai 533B Specifications
Processor Family Model Name Intel Pentium III Katmai
Performance Rating 533 MHz
Front-side Bus Speed 133 MHz
Multiplier Ratio 4.0×
Physical Design Interface Packing 242-Pin Slot 1 Cartridge
Core Voltage 2.0 volts
Power Consumption 20 watts
Maximum Power 29.7 watts
Table 6-53: Pentium III Katmai 533B Overclocking Pentium III Katmai Model Rating 533 MHz
Overclocking Potential Multiplier Lock Support Locked Multiplier
Typical Multiplier O/C N/A
Typical Front-side Bus O/C 140 MHz
Typical O/C Potential ~ 560 MHz
Maximum O/C Potential 600+ MHz
Overclocking
Tolerances Recommended Cooling Type Forced-Air Heatsink
Recommended Heatsink Coolers Globalwin VES20
Alpha P3125
Recommended Peltier Active
Cooler Swiftech MC1000
PC-10a Cooler
Maximum Core Voltage2.2 volts with Heatsink
Cooler
Table 6-53: Pentium III Katmai 533B Overclocking Pentium III Katmai Model Rating 533 MHz
Maximum I/O Voltage3.5 volts with Chipset
Cooler
Maximum Core Temperature 80 – 85° Celsius
Strategy
The Katmai 600 finished the 100-MHz front-side bus series. Taking a cue from the overclocking community, Intel slid the Katmai to a 133-MHz front-side bus rating. This new series is marked by the addition of a B modifier to each model's speed rating.
Still suffering from the .25-micron core design, the Katmai 533B provides modest overclocking potential. Perhaps worse than the processor's core limitation is the lack of support for extended front-side bus speeds in the popular 133-MHz-capable Slot 1 boards. After VIA introduced its Apollo Pro133A chipset, support for motherboard rates beyond 133 MHz began to appear in the mainstream markets. Intel released its own i815 and i820 chipsets and the latter of these offered RAMBUS memory support.
Most Katmai 533B chips can successfully overclock to 560 MHz. The retail Intel heatsink should be adequate; a core voltage increase of 0.1 volts is usually all that is required. Any increase in the front-side bus rate can offer significant performance returns through increased memory bandwidth when the memory subsystem is operating at or above the processor bus rate. The popular VIA Pro133A chipset introduced support for down-clocking memory, using asynchronous signaling.
Benchmarking will measure the performance gains, assuming memory down-clocking is employed to attain a higher front-side bus speed.
Pentium III Katmai 600B
Table 6-54: Pentium III Katmai 450 Specifications
Processor Family Model Name Intel Pentium III Katmai
Performance Rating 600 MHz
Front-side Bus Speed 133 MHz
Multiplier Ratio 4.5×
Physical Design Interface Packing 242-Pin Slot 1 Cartridge
Core Voltage 2.05 volts
Power Consumption 23 watts
Maximum Power 34.5 watts
Table 6-55: Pentium III Katmai 450 Overclocking Pentium III Katmai Model Rating 600 MHz
Overclocking Potential Multiplier Lock Support Locked Multiplier
Typical Multiplier O/C N/A
Typical Front-side Bus O/C ~ 140 MHz
Typical O/C Potential 630 – 650 MHz
Maximum O/C Potential 675+ MHz
Overclocking
Tolerances Recommended Cooling Type Forced-Air Heatsink
Recommended Heatsink Coolers Globalwin VES20
Alpha P3125
Recommended Peltier Active
Cooler Swiftech MC1000
PC-10a Cooler
Maximum Core Voltage
2.2 volts with Heatsink Cooler
Maximum I/O Voltage
3.5 volts with Chipset Cooler
Maximum Core Temperature 80 – 85° Celsius
Strategy
The Pentium III Katmai 600B offers overclocking potential similar to its 533-MHz counterpart. Notice the increase to 2.05 volts for the core voltage rating compared to 2.0 volts for older Katmai models. Intel must have recognized the limitations of its .25-micron fabrication process. A 0.05 volt increase appears minimal, but the reality is that Intel needed the bump in voltage to sustain its sales model at this higher frequency.
The Katmai 600B marked the end of a generation. It was the last .25-micron processor offered by Intel's desktop computing division. Overclocking this model proves difficult beyond 650 MHz; many chips never reach beyond the factory default of 600 MHz at a 2.05 volts core. Due to a peak power demand of 34.5 watts, the Katmai 600B will require massive cooling if overclocking returns exceeding 650 MHz are to be attained. Peltier cooling is a popular solution for this model, but the costs can be prohibitive given the small potential performance gains.