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Intel 80486SX
The Intel 80486SX is the same chip as the 80486DX with one exception: the lack of an integrated math coprocessor (floating point unit). Note that this is a different kind of difference between the SX and DX versions than is the case with the 386; the 386SX and 386DX both had no coprocessor and the 386SX had narrower data and address buses than the 386DX. The 486DX and 486SX have the same bus widths. Since it is the same chip except for the floating point processor, the 486SX has the same advantages over the 386 that the 486DX does. Note that the 486SX was made available in slower clock speeds than the 486DX; the SX comes in 16, 20, 25 and 33 MHz versions, while the DX is 25, 33 and 50 MHz.
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About a year later I upgraded it to the 486 overdrive. Cranked up the clockspeed on the bus.
Intel 80486DX2 and 80486DX2 OverDrive
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The 80486DX2 was the first chip to use "clock doubling" technology, where the processor runs at a faster speed than the memory bus it talks to. This was done to allow the processor speed to be increased without having to deal with the much more difficult task of increasing motherboard speed. Chips that run at faster than memory bus speed improve performance but at a diminishing rate as the multiplier increases, due to the processor waiting for data from memory.
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