Cyrix Cx486DLC 40GP

The Cyrix Cx486DLC plugs into a 132-pin 386 socket and will act like a 486 processor. However, because it has only 1KB L1-cache instead of 8KB it will not perform as fast as a 'real' 486.

You can use the Cx486DLC to upgrade a 386 system but keep in mind that older motherboards might not fully support it. The later model 386 motherboards usually work fine with this CPU.

I haven't benchmarked the 40MHz version yet but the Cx486DLC 33MHz version only gained 5% performance in Doom compared to a 386DX33. If you wanted a more serious performance gain (and stay on the 386 socket) the clock doubled Cyrix Cx486DRx2 33/66GP or the Texas Instruments Ti486SXL (that has 8KB L1-cache) will be in favour.