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The VL-Bus operated at the same clock speed as the i486-bus (basically a local bus) while the PCI bus also usually depended on the i486 clock but sometimes had a divider setting available via the BIOS. This could be set to 1/1 or 1/2, sometimes even 2/3 (for 50 MHz CPU clocks).
Enhanced Pentium M: updated, dual core version of the Pentium M microarchitecture used in the first Intel Core microprocessors, first x86 to have shadow register architecture and speed step technology. NetBurst commonly referred to as P7 although its internal name was P68 (P7 was used for Itanium).
The SL was designed for use in mobile computers. It was produced between November 1992 and June 1993. Clock speeds available were 20, 25 and 33 MHz. The i486SL contained all features of the i486DX. In addition, the System Management Mode (SMM) (the same mode introduced with i386SL) was included with this processor. The system management mode ...
A version of IntelDX4 featuring write-back cache was released in October 1994. The original write-through versions of the chip are marked with a laser-embossed “&E,” while the write-back-enabled versions are marked “&EW.” i486 OverDrive editions of IntelDX4 had locked multipliers, and therefore can only run at 3× the external clock speed.
20 MHz FSB, 40 MHz clock speed. This version of the 20-MHz Overdrive (ODP) was available for the 16- and 20-MHz Intel486 SX CPU for USD $549. [3] 25 MHz FSB, 50 MHz clock speed. The 25-MHz OverDrive (ODP) version was available for USD $699. [4] 33 MHz FSB, 66 MHz clock speed; 25 MHz FSB, 75 MHz clock speed; 33 MHz FSB, 100 MHz clock speed
The i486SX was a microprocessor originally released by Intel in 1991. It was a modified Intel i486DX microprocessor with its floating-point unit (FPU) disabled. It was intended as a lower-cost CPU for use in low-end systems—selling for US$258—adapting the SX suffix of the earlier i386SX in order to connote a lower-cost option.
The i486DX2 was nearly identical to the i486DX, but it had additional clock multiplier circuitry. It was the second CPU chip to use clock doubling, whereby the processor runs two internal logic clock cycles per external bus cycle. An i486 DX2 was thus significantly faster than an i486 DX at the same bus speed thanks to the 8K on-chip cache ...
On start up of the Intel 486, a hardware-controlled BIST runs for 2 20 clock cycles to check various arrays including the microcode ROM, after which control is transferred to the microcode for further self-testing of registers and computation units. [31] The Intel 486 microcode ROM has 250,000 transistors. [31]