Entry by Carlos S. M.
Soyo SY-025P2

Soyo SY-025P2


CPU support

Supported sockets:
  • Socket 3
Front Side Bus speed: 25/33/40/50 MHz
Supported architectures:
  • AMD Am486 DX P4
  • AMD Am486 DX2 (3.3V) P24C
  • AMD Am486 DX2 (5V) P24
  • AMD Am486 DX4 P24C
  • AMD Am486 SX P23
  • AMD Am5x86
  • AMD Enhanced Am486 DX2
  • AMD Enhanced Am486 DX4
  • AMD Enhanced Am486 DX4
  • Cyrix 5x86 M1sc
  • Cyrix Cx486DX M6
  • Cyrix Cx486DX2 (3.3V) M6
  • Cyrix Cx486DX2 (5V) M6
  • Cyrix Cx486DX4 M6
  • Cyrix Cx486S M5
  • Cyrix Cx487S M5
  • Intel i486 Overdrive P23T
  • Intel i486DX P4
  • Intel i486DX2 P24
  • Intel i486DX2 (WB) P24D
  • Intel i486DX4 P24C
  • Intel i486SX P23
  • Intel i486SX2
  • Intel i487SX P23N
  • Intel Pentium Overdrive P24T
  • UMC Green CPU U5D
  • UMC Green CPU U5S
  • UMC Green CPU U5SD
  • UMC Green CPU U5SX
Note! Some steppings might require updated BIOS/microcode to work properly.
Supports external cache up to 256 kB

System memory

  • Type: FPM 70/60 ns
    4x 72-pin SIMM
Max supported: 128.00 MB


Northbridge/MCH: SiS 471
Southbridge/ICH/PCH/MCP: SiS 407
512 kbit Parallel BIOS ROM

Power supply

Main board power: AT

Expansion slots

7 16-bit ISA slots
3 VESA Local Bus slots

Rear I/O ports

AT-style keyboard DIN connector

Internal I/O headers


Circuit board

AT form factor



BIOS image

  • BIOS [ZIP, 44.19 kB]
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The info you find here might not be 100% correct. This is due to a couple of reasons:
  • I'm an idiot and I misread/misspelled something
  • I have a different board revision from yours
  • The production date/plant is different and they might have used slightly different components
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