AMD Am386 SX33

An AMD Am386 SX33 on a typical 386SX-motherboard. The difference between SX and DX in the 386 range is the width of the bus. 16-bit for SX and 32-bit for DX. The 16-bit wide motherboards were cheaper to manufacture and usually look a lot like 286 motherboards (that are 16-bit, too). Actually the 16-bit performance of a 286 and 386SX is quite comparable with the 386 having the convenience of easier memory management for your base memory in DOS.

The AMD 386 is pin-to-pin compatible with Intel's 386SX. Although this CPU is soldered like most 386SX's so upgrading the CPU wasn't an option. Upgrading the CPU also meant increasing the clock-frequency of the motherboard and not all chipsets could run at 40MHz.

This particular motherboard is fitted with an Intel 387SX math co-processor. Something unusual in it's time, especially on SX motherboards.

A similar processor has been benchmarked! Click here to see this processor and the benchmarks.