IBM 6275 - PC 300 GL, Technical Information Manual

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Chapter 2. System-Board Features
Chapter 2. System Board Features
This section includes information about system-board features. For an illustration of the system board,
see “System Board, Types 6862/6892 and 6275/6285” on page 14.
Microprocessor
PC 300GL (Types 6275 and 6285) and PC 300PL (Types 6862 and 6892) come with an Intel Pentium II
microprocessor with MMX technology. The microprocessor, which has a heat sink attached, plugs directly
into a connector on the system board. For information on replacing a microprocessor or installing an
upgrade, refer to
Installing Options in Your Personal Computer.
Pentium II Microprocessor with MMX Technology
The features of this microprocessor are as follows:
Optimization for 32-bit software
Operation at a lower voltage level than previous microprocessors
64-bit microprocessor data bus
66 and 100 MHz FSB
512 KB L2 cache with ECC
32-bit microprocessor address bus
Math coprocessor
MMX technology, which boosts the processing of graphic, video, and audio data
L2 cache integrated into the microprocessor
– 4-way set associative
– Nonblocking
– 50-percent processor speed performance increase over placement of L2 cache on the system
board
More information on these microprocessors is available at http://www.intel.com on the World Wide Web.
Chip Set Control
Two components, the Intel 440BX and PIIX4E, make up the chip set that is the interface between the
microprocessor and the following:
Memory subsystem
PCI bus
IDE Bus Master connection
High-performance, PCI-to-ISA bridge
USB ports
SMBus
AGP bus
Enhanced DMA controller
RTC
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Copyright IBM Corp. June 1998