040x - Earlier 486DX-S
041x - Late 486DX-S
042x - 486SX-S
043x - 486DX2-S
044x - 486SL
045x - 486SX2-S
047x - 486DX2WB-S
048x - 486DX4-S
049x - 486DX4WB-S
148x - 486DX4-S Overdrive
1531 - Pentium Overdrive 63 for 486 systems
1532 - Pentium Overdrive 83 for 486 systems
Here's all the ones I collected, normalized. Could not find a 486GX one.
BTW, to know, here's what they mean:
In 1480 (a i486DX4-OD), the 1 means overdrive, the 4 means 486, the 8 means it's a DX4, and 0 indicates the stepping.
Or in 0430, 0 means norm CPU, 4 means 486, 3 means DX2, and 0 indicates the stepping.
In 0500, 0 means norm CPU, 5 means 5th gen, 0 means Pentium 60/66 (socket 4), and 0 indicates the stepping.