Chicony CH-498B
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Form factor:
Baby AT
PSU connector: AT-Style (P8-P9)
Chipset: UMC UM8498/8496 (486 VL Chipset "Super Energy Star Green") [UM8496, UM8498]
Dimensions: 220mm x 260mm
CPU socket: Socket 3 (PGA237)
CPU platform: 486486 (DX4)
Supported FSB speeds: 20MHz 25MHz 33MHz 40MHz 50MHz
Cache: 64 KB 128 KB 256 KB 512 KB 1 MB
Supported RAM size: 128 MB
Supported RAM types: 30-pin SIMM, 72-pin FPM
I/O ports: Expansion slots: Known issues:
  • 1x AT Keyboard
  • 3x 32-bit VLB
  • 1x 8-bit ISA
  • 7x 16-bit ISA
  • Leaky Ni-Cd clock battery
Last updated: 2021-12-26T10:53:54Z
Drivers: not available
BIOS images: 4 files
Manuf. POST String Note Core Ver. BIOS Ver.
AMI 40-P307-001116-00101111-072594-UMC498-H 072594 3.07
AMI 40-P305-001116-00101111-072594-UMC498-H 072594 3.05
AMI 40-P303-001116-00101111-072594-UMC498-H 072594 3.03
AMI 40-E301-001116-00111111-121593-UMC498-H 121593 3.01
Documentation: 1 entry
Model Speed FSB Voltages L1 Cache L2 Cache L3 Cache Core Process TDP
UMC U5S-SUPER40 40MHz 40MHz 5V 8KB - - U5S 600nm -
UMC U5S-SUPER33 33MHz 33MHz 5V 8KB - - U5S 600nm -
UMC U5S-SUPER25 25MHz 25MHz 5V 8KB - - U5S 600nm -
AMD Am486 DX2-80 80MHz 40MHz 5V 8KB - - - - -
AMD Am486 DX-40 40MHz 40MHz 5V 8KB - - - - -
AMD Am486 DX4-120 120MHz 40MHz 3.3V 8KB - - - 500nm 3W
AMD Am486 DX4-120 120MHz 40MHz 3.3V 8KB - - - 500nm 3W
AMD Am486 DX2-80 80MHz 40MHz 3.3V 8KB - - - 500nm 2W
AMD Am486 DX2-80 80MHz 40MHz 3.3V 8KB - - - 500nm 2W
AMD Am486 DX4-100 100MHz 33MHz 3.3V 16KB - - - 350nm 2W
AMD Am486 DX4-100 100MHz 33MHz 3.3V 8KB - - - 500nm 2W
AMD Am486 DX4-100 100MHz 33MHz 3.3V 8KB - - - 500nm 2W
AMD Am486 DX2-66 66MHz 33MHz 3.3V 8KB - - - - 2W
AMD Am486 DX2-66 66MHz 33MHz 3.3V 16KB - - - 350nm 2W
Cyrix Cx486 DX-50 50MHz 50MHz 5V 8KB - - M6 - -
Cyrix Cx486 DX2-80 80MHz 40MHz 5V 8KB - - M7 - -
Cyrix Cx486 DX-40 40MHz 40MHz 5V 8KB - - M6 - -
Cyrix Cx486 DX2-66 66MHz 33MHz 5V 8KB - - M7 - -
Cyrix Cx486 DX2-66 (WB) 66MHz 33MHz 5V 8KB - - M7 - -
Cyrix Cx486 DX-33 33MHz 33MHz 5V 8KB - - M6 - -
Cyrix Cx486 DX2-50 50MHz 25MHz 5V 8KB - - M7 - -
Cyrix Cx486 DX2-50 (WB) 50MHz 25MHz 5V 8KB - - M7 - -
Cyrix Cx486 DX2-v80 80MHz 40MHz 3.45V 8KB - - M7 - -
Cyrix Cx486 DX2-v66 66MHz 33MHz 3.45V 8KB - - M7 - -
Cyrix Cx486 DX2-v66 (WB) 66MHz 33MHz 3.45V 8KB - - M7 - -
Cyrix Cx486 DX-v33 33MHz 33MHz 3.3V 8KB - - M6 - -
Cyrix Cx486 DX2-v50 50MHz 25MHz 3.45V 8KB - - M7 - -
Intel i486 DX 50 50MHz 50MHz 5V 8KB - - P4 1000nm -
Intel OverDrive 486DX4-100 (PGA168) 100MHz 33MHz 5V 8KB - - - - -
Intel OverDrive 486DX4-100 (PGA169) 100MHz 33MHz 5V 8KB - - - - -
Intel Pentium OverDrive 83 83MHz 33MHz 5V 32KB - - P24T 350nm -
Intel OverDrive 486DX2-66 (PGA169) 66MHz 33MHz 5V 8KB - - P4T - -
Intel OverDrive 486DX2-66 (PGA168) 66MHz 33MHz 5V 8KB - - P4T - -
Intel OverDrive 486SX2-66 (PGA169) 66MHz 33MHz 5V 8KB - - P23T - -
Intel i486 DX2 66 66MHz 33MHz 5V 8KB - - P24 800nm 5W
Intel i486 DX2 66 (WB) 66MHz 33MHz 5V 8KB - - P24D 800nm -
Intel i486 SX 33 33MHz 33MHz 5V 8KB - - P23 1000nm -
Intel i486 DX 33 33MHz 33MHz 5V 8KB - - P4 1000nm -
Intel OverDrive 486DX4-75 (PGA168) 75MHz 25MHz 5V 8KB - - - - -
Intel OverDrive 486DX4-75 (PGA169) 75MHz 25MHz 5V 8KB - - - - -
Intel Pentium OverDrive 63 63MHz 25MHz 5V 32KB - - P24T - -
Intel OverDrive 486SX2-50 (PGA169) 50MHz 25MHz 5V 8KB - - P23T - -
Intel OverDrive 486DX2-50 (PGA168) 50MHz 25MHz 5V 8KB - - P4T - -
Intel OverDrive 486DX2-50 (PGA169) 50MHz 25MHz 5V 8KB - - P4T - -
Intel i486 DX2 50 50MHz 25MHz 5V 8KB - - P24 800nm -
Intel i486 SX2 50 50MHz 25MHz 5V 8KB - - - 800nm -
Intel i486 DX2 50 (WB) 50MHz 25MHz 5V 8KB - - P24D 800nm -
Intel i486 SX 25 25MHz 25MHz 5V 8KB - - P23 1000nm -
Intel i486 DX 25 25MHz 25MHz 5V 8KB - - P4 1000nm -
Intel OverDrive 486SX2-40 (PGA168) 40MHz 20MHz 5V 8KB - - P23T - -
Intel i486 SX 20 20MHz 20MHz 5V 8KB - - P23 1000nm -
Intel i486 DX4 100 100MHz 33MHz 3.3V 16KB - - P24C 600nm -
Intel i486 DX4 100 100MHz 33MHz 3.3V 16KB - - P24C 600nm -
Intel i486 DX2 66 66MHz 33MHz 3.3V 8KB - - P24C 600nm -
Intel i486 DX4 75 75MHz 25MHz 3.3V 16KB - - P24C 600nm -
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