Base 3
| Base 3 | |
|---|---|
|
|
| Specifications | |
| design type | PGA - ZIF |
| contacts | 237 (19 × 19) |
| Bus protocol | 486 |
| Bus cycle | 25, 33, 40, 50 MHz |
| Operating voltage | 3.3V, 3.45V, 5.0V |
| Processors |
Intel i486SX (16–33 MHz) Intel i486SX2 (50–66 MHz) Intel i486DX (20–33 MHz) Intel i486DX2 (50–80 MHz) Intel i486DX4 (75–120 MHz) Intel Pentium OverDrive (63–83 MHz) AMD Am486 DX-2 (80 MHz) AMD Am5x86 (133 MHz) Cyrix 5x86 (100–120 MHz) and compatibles |
The base 3 was the standard socket for the Intel i486 processor. In contrast to the predecessor socket 2 , processors for socket 3 could be supplied with 5.0 V, 3.3 V or 3.45 V processor core voltage (V core ) depending on the type . A second socket 3 was often provided on mainboards in order to retrofit a math coprocessor , the Intel 80487 , which was missing in the SX variants of the i486. The 80487 was actually an i486 DX with a different pin assignment, the i486SX processor was completely switched off.
Typical chipsets for socket 3 mainboards were:
- Intel 420 (Saturn I / II, Aries)
- ALi 1429/1439/1489
- OPTi 82C495 / 895
- Silicon Integrated Systems SiS 85C406 / 461/471 / 49x
- United Microelectronics Corporation UM8498 / 888x
- VIA Technologies 82C496 (Pluto)