To make the situation even more confusing Intel, in an attempt to make up for the delay in the release of the 64 bit +Pentium OverDrive chip, did release a 32 bit OverDrive processor called the 486 OverDrive. Intel produced a range of Overdrive chips in order to supply upgrade paths for most of the 486 hardware. 486 System Boards could have an 486 OverDrive chip fitted so long as they had :-
Clock speed | Processor speed | Replaces a 486SX | Replaces 486DX |
---|---|---|---|
20 | 40 | DX20DP50 | |
25 | 50 | DX20DP50 | DX20DPR50 |
33 | 66 | DX20DP66 | DX20DPR66 |
The above chips feature: Internal maths co-processor
Internal clock speed is 2 times the external clock speed
Clock speed | Processor speed | Replaces a 486SX | Replaces 486DX |
---|---|---|---|
20 | 60 | DX40DP75 | |
25 | 75 | DX40DP75 | DX40DPR75 |
33 | 100 | DX40DP100 | DX40DPR100 |
The above chips feature: Enhanced on-chip cache
Enhanced internal maths co-processor, Internal clock speed is 3 times the external clock speed
The Pentium OverDrive chips have a fan built into a heatsink on top of the chip but the 486 OverDrive chips only have the heatsink and do not require a fan on the processor chip.
Clock speed | Processor speed | Replaces 486SX | Replaces 486DX |
---|---|---|---|
20 | 50 | P0DP5V73 | |
25 | 63 | P0DP5V63 | P0DP5V63 |
33 | 83 | P0DP5V83 | P0DP5V83 |
25 | 63 | P0DP5V63 | P0DP5V63 |
33 | 83 | P0DP5V83 | P0DP5V83 |
The features of these processors are, Superscalar Architecture, Enhanced On-Chip Cache
Faster Maths Coprocessor, Internal clock speed is 2.5 times the external clock speed.