Professional GX

Aka L486
The product code on the bottom of the machine is GX486D668H
I think it is the same as product code L486DX2668FAH
My machine has a DX2/66 and 2 megabytes of video memory. I think it supports 1280x1024 video resolution.
The FCC ID is EJM486HID2HR

On the front left corner of the motherboard, there are three stickers:
PBA 617504-005
AA 617449-005
P21030184

Manual for the Intel Professional/GX system

A page from Apple's NextStep Division

A thread about the Professional/GX on the next-prog archive

A description of the Professional/GX for the Solaris Hardware Compatibility list

Companies who might still have information about it:

Press F1 to get into BIOS setup.