Vintage Gigabyte GA-486AM Socket 3 motherboard bundled with an Intel 486DX4-100 CPU and 32MB RAM – fully tested and ideal for retro computing enthusiasts or collectors. The GA-486AM utilizes a UMC chipset, supporting a range of 486-series processors including SX, DX, DX2, DX4, and Pentium OverDrive up to 100MHz internal clock speeds, with jumper-configurable CPU voltage (3.3V for the DX4-100 or 5V for earlier models) and clock multipliers (e.g., 3x on a 33MHz bus for 100MHz operation). It offers up to 128MB of onboard DRAM via four banks of 72-pin SIMM modules (FPM parity type, configured here as 32MB total), expandable cache from 128KB to 1MB in write-back or write-through modes, three 32-bit PCI expansion slots, onboard floppy and dual IDE controllers, parallel and dual serial ports, and an Award BIOS for reliable setup. This setup has been thoroughly tested, with verification photos uploaded, and includes a new replacement for the Dallas RTC chip to maintain accurate timekeeping and CMOS settings.

https://theretroweb.com/motherboards/s/gigabyte-ga-486am#docs

Combined shipping is available, if you have any questions, feel free to ask.