AMD Am5x86 or Am486DX5 is a microprocessor by Advanced Micro Devices. It is referred to internally as AMD - X5, presumably due to the higher relative to the multiplier DX4 models.
The Am5x86 was presented in November 1995. It is based largely on the Enhanced Am486DX4, but it was produced in a smaller process and got a 16 KB L1 cache twice as large. Clock frequency and the multiplier could be further raised. The Am5x86 has therefore, unlike its namesake Cyrix 5x86, no further modifications or 5th generation features.
Because of its internal multiplier of " 4" the Am5x86 is actually the only real 80486DX4 (these have only an internal multiplier of " 3" ), but was due to its high speed compared to the other 80486 CPUs and fierce competition from Intel's Pentium equipped with a new name and a P rating model called rating: The Am5x86 - P75 clocked at 133 MHz ( 33 MHz × 4). Variants with 150 MHz (50 MHz × 3, Am5x86 - P75 ) and 160 MHz ( 40 MHz × 4, Am5x86 -P90 ) were announced. The version with 150 MHz is extremely rare, the 160 MHz version, however, never appeared. Models below 133 MHz were sold as Enhanced Am486 with 16 KB L1 cache.
Together with the Cyrix 5x86 and the NexGen Nx586 he is the first processor that used a P rating.
For the Am5x86 - P75 special motherboards came on the market on which a multiplier of " 4 × " can be set. If this possibility, the CPU can with a multiplier of " 3 × " are operated and is then recognized as Am486DX4. When operating at 100 MHz ( 33 MHz x 3) when using a very large heat sink to operate without processor fan possible. Operation at 120 MHz (40 MHz x 3) is also possible with CPU fan.
In contrast to the Cyrix 5x86 100/120GP the Am5x86 - P75 interprets a multiplier setting of 2 × as 4 ×, whereby the Am5x86 - P75 on any 486 motherboard with a standard base 3 can fully operate theoretically, which has a processor voltage supply of 3, 45 or 3.3 volt support. If there is only a 5-volt CPU power, you can take a standard voltage converter intermediate base from 5V to 3.3 / 3.45 V for this purpose, which also adjust for the Am5x86 - P75, a multiplier of 2 × on the support leg is, so that the processor at 133 MHz (33 MHz x 4) runs.
The Am5x86 - P75 is available in three versions that differ in their maximum allowable processor package surface temperature:
- AMD -X5 - 133ADW = 55 ° C
- AMD -X5 - 133ADY = 75 ° C
- AMD -X5 - 133ADZ = 85 ° C
Although the Am5x86 -P90 was never 160 MHz on the market, but unofficially circulated his time systems with a Am5x86 with 160 MHz. It is an overclocked Am5x86 - P75 133 Mhz (usually the ADF version), which will be held at 33 MHz operation with 40 MHz FSB and equipped with correspondingly powerful cooling system.
The Am5x86 was produced until 1999 for ordinary PCs, but is still manufactured for use in embedded systems.
Am5x86 (X5 )
Alternative title: Am486DX5
- L1 cache: 16 KB
- L2 - Cache: depending on the motherboard or chipset used
- Base 3 with an FSB of 33, 40 or 50 MHz,
- Operation voltage ( Vcore ): 3.45 and 3.3 V
- Release Date: September, 1995
- Manufacturing Technology: 0.35 micron
- The size: 43 mm ² at 1.6 million transistors
- Clock rates: 133 MHz Am5x86 - P75: 133 MHz ( 33 MHz × 4)
- Am5x86 - P75 : 150 MHz (50 MHz x 3) - very rare
- Am5x86 -P90: 160 MHz ( 40 MHz × 4) - do not come on the market