The most kickass 486 chip intel ever produced. The 80486DX/50 was slightly slower processor-speed-wise than the 80486DX2/66, but the increased bus speed led to overall greater system performance. The 80486DX/50 also totally creamed the 80486DX2/50, as the latter ran at a paltry clock speed of 25Mhz. I overclocked mine to 66Mhz, though, and it never faltered. The DX50 was eventually discontinued due to the fact that you could fry bacon on it.