Intel 80486 OverDrive Processor

关于 Intel 80486 OverDrive

Intel 486 OverDrive 是提供 80486 使用者升级选择（不过还是升级到 80486 等级）的中央处理器，基本上其作用原理就是比原来使用更高的倍频。ODP 需要使用特殊的转接插座，而 ODPR 则是将原来的处理器直接换掉（所以针角数是一样的）。Intel 486 OverDrive 早期的命名是以内频为命名基准，所以以 ODPR486DX-25 来说，其速度为 50 MHz，后来 Intel 才使用新的命名方法。 Intel OverDriver DX4 100MHz Mechanical Sample 也是非常少见的藏品，不过以它连工作频率都标上去了的情况来看，这颗机械样品应该是可以运作的。

Introduction

Intel OverDrive processors are a category of various Intel CPUs that were produced to upgrade computers. ODP is the acronym for Over Drive Processor, however most OverDrives are ODPR (Over Drive Processor Replacement) chips: To upgrade a computer to a new processor you just replace it with the new one. Their interfaces appear to the motherboard like an older chip, so you don’t need to worry about whether or not the motherboard supports the higher speeds. ODP chips (like the DX2ODP66 or the ODP486SX-25) in contrast were made for additional sockets on the mainboard, the Performance Upgrade Socket.

On older versions Intel labeled the OverDrive chips with the external local bus speed they supported, like the ODP486SX-25 and ODPR486DX-33. Since all these OverDrive chips have the clock doubling feature, it was assumed by Intel that everyone knows that the CPU runs at twice the bus speed internally. Newer chips follow the DX2/DX4 naming scheme of the i486 DX.

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Intel OverDrive DX2ODPR66 (V4.0)