32-bit processors: the 80486 range

80486DX
• Introduced April 10, 1989
• Clock speeds:
o 25 MHz with 20 MIPS (16.8 SPECint92, 7.40 SPECfp92)
o 33 MHz with 27 MIPS (22.4 SPECint92 on Micronics M4P 128 KB L2), introduced 7 May 1990
o 50 MHz with 41 MIPS (33.4 SPECint92, 14.5 SPECfp92 on Compaq/50L 256 KB L2), introduced 24 June 1991
• Bus Width 32 bits
• Number of Transistors 1.2 million at 1 µm; the 50 MHz was at 0.8 µm
• Addressable memory 4 GB
• Virtual memory 1 TB
• Level 1 cache of 8 KB on chip
• Math coprocessor on chip
• 50X performance of the 8088
• Used in Desktop computing and servers
• Family 4 model 3
80486SX
• Introduced April 22, 1991
• Clock speeds:
o 16 MHz with 13 MIPS
o 20 MHz with 16.5 MIPS, introduced 16 September 1991
o 25 MHz with 20 MIPS (12 SPECint92), introduced 16 September 1991
o 33 MHz with 27 MIPS (15.86 SPECint92), introduced 21 September 1992
• Bus Width 32 bits
• Number of Transistors 1.185 million at 1 µm and 900,000 at 0.8 µm
• Addressable memory 4 GB
• Virtual memory 1 TB
• Identical in design to 486DX but without math coprocessor. The first version was an 80486DX with disabled mathco in the chip and different pin configuration. If the user needed math co capabilities, he must add 487SX which was actually an 486DX with different pin configuration to prevent the user from installing a 486DX instead of 487SX, so with this configuration 486SX+487SX you had 2 identical CPU's with only 1 turned on)
• Used in low-cost entry to 486 CPU desktop computing
• Upgradable with the Intel OverDrive processor
• Family 4 model 2
80486DX2
• Introduced March 3, 1992
• Clock speeds:
o 40 MHz
o 50 MHz
o 66 MHz
o 100 MHz (This was only made a short time due to high failure rates.)
80486SL
• Introduced November 9, 1992
• Clock speeds:
o 20 MHz with 15.4MIPS
o 25 MHz with 19 MIPS
o 33 MHz with 25 MIPS
• Bus Width 32 bits
• Number of Transistors 1.4 million at 0.8 µm
• Addressable memory 4 GB
• Virtual memory 1 TB
• Used in notebook computers
• Family 4 model 3
80486DX4
• Introduced March 7, 1994
• Clock speeds:
o 75 MHz with 53 MIPS (41.3 SPECint92, 20.1 SPECfp92 on Micronics M4P 256 KB L2)
o 100 MHz with 70.7 MIPS (54.59 SPECint92, 26.91 SPECfp92 on Micronics M4P 256 KB L2)
• Number of Transistors 1.6 million at 0.6 µm
• Bus width 32 bits
• Addressable memory 4 GB
• Virtual memory 64 TB
• Pin count 168 PGA Package, 208 sq ftP Package
• Die size 345 mm²
• Used in high performance entry-level desktops and value notebooks
• Family 4 model 8