... and bottom view with gold plated pins.
top.jpg|200px|thumb| An Intel i486DX2-66 Microprocessor, top view]] ▲
[[Image:Intel 80486DX2 bottom.jpg|200px|thumb|... and bottom view with gold plated pins.]]
The '''Intel 80486DX2''' is a [[Central processing unit|CPU]] produced by [[Intel]] that was introduced in []. The 80486DX2 is identical to a [[Intel 80486DX|80486DX]] but for the addition of "[[clock doubling]]" technology. It was the first chip to use clock doubling, whereby the processor performs two [[clock cycle]]s per single cycle of the memory bus. Essentially, the processor's speed is set to double of the speed of the system bus. Because of this, an Intel 80486DX2 is faster than an [[Intel 80486DX]]-based system at the same processor speed; a normal DX chip performs one processor clock cycle per system bus cycle (is aligned to the same speed as the system's bus).
Intel produced two 80486DX2 [[Central processing unit|CPUs]]:
*50 MHz CPU for systems with a 25 MHz [[front side bus]]
*66 MHz CPU for systems with a 33 MHz front side bus
The Legend of the DX2-66 ==
For most people brought up during the 32-bit era the 80486DX2-66 is a legendary processor. Often coupled with 8 MB or 16 MB of RAM and a [[VESA_Local_Bus|VESA Local Bus]] video card, they were the top tier processor when they were released, a solid mid-range configuration option soon after and a decent performer on a budget at the end of their life cycle. The DX2-66 is often remembered most because of its excellent performance on the generation of games current at its release. Soon after, as more games demanded a 486 processor, the DX2-66 shone as a solid performer overtaking the SX-25 and SX-33 configurations as the system of choice for most computers. During the end of its lifespan, with the introduction of 3D graphics, the DX2-66 started to fall behind. Nevertheless, while [[Quake]]'s system requirements listed "[[Pentium]]" on the box, a DX2-66 could comfortably handle Quake at lower resolutions.
[[AMD]] also produced an 80 MHz 'DX2' chip for systems with a 40 MHz front side bus.
It is now standard practice for a CPU to perform more than one clock cycle per bus clock cycle.
[[Category:x86 microprocessors|Intel 4862]]