The 486: An FPU And Multipliers Too
Source: Tom's Hardware – Keywords: intel, cpu, history
The 486: An FPU And Multipliers Too
The 486 is emblematic of a certain generation who were first discovering computers. In fact, the very famous 486 DX2/66 was long considered the minimum configuration for gamers. This processor, released in 1989, ushered in several interesting new features, like an on-chip FPU, data cache, and the first clock multiplier. The former consisted of an x87 coprocessor built into the 486 DX (not SX) series. An 8 KB Level 1 cache was built into the processor (write-through type, then write-back with slightly better performance). There was also the possibility of a Level 2 cache on the motherboard (at the bus frequency).
The second generation of 486s had a CPU multiplier, since the processor operated faster than the FSB, with DX2 (2x multiplier) and DX4 (3x multiplier) versions. Another anecdote: the “487SX” sold as an FPU for the 486SX was actually a full 486DX that disabled and took the place of the first processor.
| Code name | P4, P24, P24C |
| Date released | 1989 |
| Architecture | 32 bits |
| Data bus | 32 bits |
| Address bus | 32 bits |
| Maximum memory | 4096 MB |
| L1 cache | 8 KB |
| L2 cache | Motherboard (FSB frequency) |
| Clock frequency | 16-100 MHz |
| FSB | 16-50 MHz |
| FPU | On chip |
| SIMD | No |
| Fabrication process | 1,000–800 nm |
| Number of transistors | 1,185,000 |
| Power consumption | N/A |
| Voltage | 5 V–3.3 V |
| Die surface area | 81 - 67 mm² |
| Connector | 168 pins |
The DX4 had a 16 KB cache and a few more transistors: 1.6 million. This processor, using a 600 nm process and measuring 76 mm², consumed less power than the original 486 (at a voltage of 3.3 V).
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Wasn’t one of the key features of the Pentium Pro line of processors the increase in IRQs to 256 rather than the 16 of the previous generations?
In the days of virtual IRQs assigned by windows it's easy to forget the headache of trying to install multiple interface cards without running out of resources.
am I mistaken? or the Maximum memory figures are wrong? 4096MB or is it KB on 386, 486 and Pentium MMX class CPU's. and 64MB on P-II and so on.
Modern Intel CPU: P1-> P3 -> P4M -> C2D -> C2Q
Modern AMD CPU: P1(Intel) -> P3(Intel) -> K8 -> K10
Next gen CPU: Modified P1
The Pentium 1 & 3 are possibly the most widely base processor in modern computing. Even AMD's chips are based on them.
Hmm....
Interesting...AMD chips based on P3... EHEHEHEHHEHEHE
I think you need a...khhmmm...LIFE
cheers
Nice article that made me a little bit misty-eyed and nostalgic (being of the original 8086 generation)
Did a bit of a clear-out of my parts boxes not so long ago and found a couple of PPro's, a 486DX2/66, a 386SX and a 386DX. Threw them out but perhaps should have built a little shrine? ;p
Cheers.
There are some errors in the article, Pentium M Dothan had a 2.26GHz model which is not mentioned there, they had a VCore of 1.356V and a TDP of 27W, not 36W like stated here, also it's die size is 88mm2, not 87mm2, it also came as a socket 478 which was incompatible with the Pentium 4 socket 478 due to it's electrical differences.