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IBM 486
From ThinkWiki
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IBM 486
Most of the IBM 486 CPUs were based on Intel and Cyrix 386 cores, which IBM extended with support for the 486 instruction set, wider busses and other features.
Features
- 16 KB L1-Cache
- no L2-Cache
- 16 bit external bus (SLC, SLC2), 32 bit external bus (all others)
- 32 bit internal bus
- max of 16MB addressable memory (on the SLC and SLC-2 only)
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Available Types and ThinkPads featuring them
| Model/Freq. (MHz) | FSB (MHz) | FPU | VCore (MHz) | TDP (W) | ThinkPad Models
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| 486 DX4
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| 100 | 33 | • | ... | ... |
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| 75 | 25 | • | ... | ... |
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| Blue Lightning 486 DX2
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| 80 | 40 | • | ... | ... |
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| 66 | 33 | • | ... | ... |
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| 50 | 25 | • | ... | ... |
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| 486 DX2
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| 80 | 40 | ... | ... | ... |
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| 66 | 33 | ... | ... | ... |
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| 50 | 25 | ... | ... | ... |
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| Blue Lightning 486 BLX3
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| 100 | 33 | ... | ... | ... |
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| 75 | 25 | ... | ... | ... |
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| 60 | 20 | ... | ... | ... |
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| 45 | 15 | ... | ... | ... |
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| Blue Lightning 486 BLX2
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| 66 | 33 | | ... | ... |
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| 50 | 25 | | ... | ... | 510Cs
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| 40 | 20 | | ... | ... |
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| 30 | 15 | | ... | ... |
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| Blue Lightning 486 BLX - 0.8µm
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| 33 | 33 | | 3.3 | ... |
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| 25 | 25 | | 3.3 | ... |
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| 20 | 20 | | 3.3 | ... |
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| 15 | 15 | | 3.3 | ... |
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| 486 DLC2
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| 66 | 33 | ... | ... | ... |
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| 486 DLC
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| 33 | 33 | ... | ... | ... |
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| 486 SLC2
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| 80 | 40 | | 3.3 | ... |
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| 66 | 33 | | 3.3 | ... | 340CSE
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| 50 | 25 | | 3.3 | 2.3 | 340CSE, 500, 555BJ, 720, 720C
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| 40 | 20 | | 3.3 | 1.7 |
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| 32 | 16 | | 3.3 | ... |
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| 486 SLC
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| 25 | 25 | | 3.3 | 1.3 | 340
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| 25 | 25 | | ... | ... | 550BJ, 700, 700C, 710T
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| 20 | 20 | | 3.3 | 1.0 |
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| 20 | 20 | | ... | ... |
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| 16 | 16 | | ... | ... |
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Thermal Specifications
GCC Optimization Flags
