Intel 80486 OverDrive
Encyclopedia
The Intel's i486 OverDrive processors are a category of various Intel 80486
s that were produced with the designated purpose of being used to upgrade
personal computer
s. The OverDrives typically possessed qualities different from 'standard' i486s
with the same speed steppings. Those included built-in voltage regulator
s, different pin-outs, write-back cache
instead of write-through cache
, built-in heatsinks, and fanless operation - features that made them more able to work where an ordinary edition of a particular model would not.
Intel 80486
The Intel 80486 microprocessor was a higher performance follow up on the Intel 80386. Introduced in 1989, it was the first tightly pipelined x86 design as well as the first x86 chip to use more than a million transistors, due to a large on-chip cache and an integrated floating point unit...
s that were produced with the designated purpose of being used to upgrade
Upgrade
The term upgrade refers to the replacement of a product with a newer version of the same product. It is most often used in computing and consumer electronics, generally meaning a replacement of hardware, software or firmware with a newer or better version, in order to bring the system up to date...
personal computer
Personal computer
A personal computer is any general-purpose computer whose size, capabilities, and original sales price make it useful for individuals, and which is intended to be operated directly by an end-user with no intervening computer operator...
s. The OverDrives typically possessed qualities different from 'standard' i486s
Intel 80486
The Intel 80486 microprocessor was a higher performance follow up on the Intel 80386. Introduced in 1989, it was the first tightly pipelined x86 design as well as the first x86 chip to use more than a million transistors, due to a large on-chip cache and an integrated floating point unit...
with the same speed steppings. Those included built-in voltage regulator
Voltage regulator
A voltage regulator is an electrical regulator designed to automatically maintain a constant voltage level. A voltage regulator may be a simple "feed-forward" design or may include negative feedback control loops. It may use an electromechanical mechanism, or electronic components...
s, different pin-outs, write-back cache
CPU cache
A CPU cache is a cache used by the central processing unit of a computer to reduce the average time to access memory. The cache is a smaller, faster memory which stores copies of the data from the most frequently used main memory locations...
instead of write-through cache
CPU cache
A CPU cache is a cache used by the central processing unit of a computer to reduce the average time to access memory. The cache is a smaller, faster memory which stores copies of the data from the most frequently used main memory locations...
, built-in heatsinks, and fanless operation - features that made them more able to work where an ordinary edition of a particular model would not.
Models
Models available included:- 25 MHz FSB, 100 MHz core
- 33 MHz FSB, 133 MHz core
See also
- Pentium OverDrivePentium OverDriveThe Pentium OverDrive was a microprocessor marketing brand name used by Intel, to cover a variety of consumer upgrade products sold in the mid 1990s. It was originally released for 486 motherboards, and later some Pentium sockets...
- RapidCADRapidCADRapidCAD is a specially packaged Intel 486DX and a dummy floating point unit designed as pin-compatible replacements for an Intel 80386 processor and 80387 FPU. Because the i486DX has a working on-chip FPU, a dummy FPU package is supplied to go in the Intel 387 FPU socket...