Entry by Carlos S. M.
PCChips M590

PCChips M590 Revision 1.2


CPU support

Supported sockets:
  • Socket 7
Front Side Bus speed: 60/66/75/83*/100* MHz MHz
Supported architectures:
  • AMD K6 Little Foot
  • AMD K6 Model 6
  • AMD K6-2 Chomper
  • Cyrix 6x86L M1L
  • Cyrix 6x86MX / MII MII
  • IDT Winchip C6
  • Intel Pentium P54C
  • Intel Pentium P54CQS
  • Intel Pentium P54CS
  • Intel Pentium MMX P55C
Note! Some steppings might require updated BIOS/microcode to work properly.
Supports external cache up to 1024 kB
100 MHz support is unofficial, so it technically doesn't qualify as Super Socket 7.

System memory

  • Type: SDRAM 66/100 MHz
    2x 168-pin DIMM
  • Type: EDO 70/60 ns
    2x 72-pin SIMM
Max supported: 384.00 MB


Northbridge/MCH: SiS 5591
Southbridge/ICH/PCH/MCP: SiS 5595
SuperIO: ITE IT8770F
SiS 6326 integrated graphics, with max 8 MB of EDO VRAM
SoundPRO HT1869V+ audio IC over PCI bus
1 Mbit Parallel BIOS ROM

Power supply

Main board power: 20-pin ATX
Additional power sources: Optional AT power supply input

Expansion slots

3 PCI slots
2 16-bit ISA slots

Rear I/O ports

AT-style keyboard DIN connector

Internal I/O headers

2x USB 1.1 (15 Mb/s)
2x RS232 serial
1x parallel
Audio headers: Line out, Microphone in, Aux in, CD in, S/PDIF
MIDI/gameport header
IrDA header


2 IDE channels, up to 33 MB/s
Floppy connector, up to 2 drives

Circuit board

Baby AT form factor
PCB manufactured in the year 1998


This board uses the PC100 PCChips relabel for the chipset.
Proprietary headers for breakout cards (for pinouts refer to manual):
- J1: sound and game port
- J3: PS/2 mouse, IrDA, 2 USB ports
- JP4: VGA output
The sound chip is a rebranded C-Media CMI8330.




All files are checked before upload to make sure no harmful software is included. If your antivirus software gets triggered, it's most likely a false positive.


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
Feel free to improve the quality and quantity of this database by contributing with your entries. Use the contact links in the footer to get in touch.

Share this board

Latest motherboards

Gigabyte GA-EP45-UD3LR

Intel P45/Intel ICH10R motherboard for LGA775 CPUs.


VIA VT82C694X/VIA VT82C686B motherboard for PGA370 CPUs.

Gigabyte GA-EX58-UD4

Intel X58/Intel ICH10R motherboard for LGA1366 CPUs.

Latest articles

So... you want to build a Windows 98 retro PC?

By realismbro285, published 2021-05-20

A few notes on the hardware database

By bobosG, published 2021-04-19