Intel NG80386SX-25

25 MHz100-pin plastic QFPIntel 80386SX microprocessor was a cost-effective version of the 80386DX. The SX processor had 16-bit external data bus - this allowed the CPU to work with cheaper 16-bit hardware, but at the same time it made access to 32-bit memory data slower. The 80386SX also had 24-bit address bus, which limited CPU's physical memory to 16 MB. Because the processor didn't work with 32-bit buses like the 80386DX, it didn't require as many signal pins. The 80386SX processors were manufactured in 100-pin package, or 32 pins less than the number of pins on DX package.