486SLC2 CPU Upgrade

192-145 IBM 486SLC2 Processor Upgrade 85xx
192-227 PS/2 486SLC2 Processor Upgrade For PS/2 57 SX (?)
194-377 Options by IBM: Processor Upgrade Products
392-223 IBM PS/2 Models 56 SLC and 57 SLC 486 SLC Upgrade Modification

slc_util.exe 8555-SLC2 processor upgrade utility disk (720K image!)


IBM 486SLC2 Processor Upgrade
FRU 10G7103 P/N 32G3672 (EMEA) P/N 2609582-2620 (USA)

U1 Socket for PLCC 387SX
U3 Reverse of mounting pins
U8 486SLC2 CPU


Upgrade Installation

This can be installed on a 8556 SX/SLC and 8557 SX/SLC.

  1. Remove any installed Math-Co (and also any math-Co empty socket)
  2. Install plastic guide and plastic insert on planar.
  3. Insert any removed Math Copro into 486SLC2 Processor Upgrade board in U1.
  4. Install Upgrade board until pins are fully-seated, and edge-snaps click into place.


Features and Performance Enhancements

  • IBM 486SLC2 microprocessor (40MHz internal/20MHz external)
  • 486SX-compatible Instruction Set
  • Internal memory cache controller and integrated 16KB cache memory
  • Improves CPU throughput up to 271% for 386SX-20, 99% for 386SLC-20 systems. Throughput is up to 53% better than for 486SX-20 based systems and up to 20% greater than 486SX-25 based systems.
  • 16-byte wide cache line size
  • Enhances performance, particularly computer-intensive applications
  • Allows upgrade of Model 56 SX / SLC and Model 57 SX / SLC and M57 SLC systems
  • Installs into a Math Co-Processor socket connector
  • Provides a socket for 80387SX 20MHz, or equivalent Math Co-Pro
  • 16MB real memory addressability
  • 64TB (TB = terabytes) virtual memory addressability


PUZZLE Benchmark

   The diskette utility provided with the 486SLC Processor Upgrade contains a benchmark test called PUZZLE.EXE. When this test is performed on a system with the processor upgrade, the results are consistent with the test results of the original system board with the Intel 386SX processor installed (45-125 seconds).


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