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X5 · AMD
Intel 486 socket-compatible processor. Doubled cache memory.
This CPU introduces the so-called "Pentium Rating" PR-75 indicates that this 133 MHz chip can compete against Intel Pentium 75 MHz.
Basically a fast version of the 486 architecture, marketed as a competitor to the Intel's Pentium, a true 586 chip.
| Specification | Value |
|---|---|
| Introduced | 1995 |
| Arch Generation | 4.5 |
| Architecture / Codename | X5 |
| Cores / Threads | 1 |
| Technology Node | 500 nm(?) |
| Die Size | ? |
| Transistors | 1.6 million |
| Frequency | 133 MHz (PR75) |
| Instructions | x86. |
| TDP | ~15 watt? |
| Cache L1 | 16 KB (shared between instructions+data) |
| Cache L2 | up to 512 KB on the main-board. |
| Memory Type | Fast page mode DRAM (FPM) |
| Chip | 1. a much faster internal data bus (66 MHz vs 33 MHz on the 486), 2. faster memory (EDO RAM vs FPM RAM) 3. faster device bus (PCI vs ISA) 4. L1 cache must be devided into separate instructions + data. (otherwise there is high latency) AMD Am5x86 fails on all 4 of those points. Therefore we can conclude that the AMD Am5x86 is really a 486 architecture inside, repainted as new. |