{"id":425,"date":"2018-03-16T11:28:48","date_gmt":"2018-03-16T18:28:48","guid":{"rendered":"https:\/\/www.karlstechnology.com\/blog\/?p=425"},"modified":"2019-05-28T23:17:07","modified_gmt":"2019-05-29T06:17:07","slug":"cyrix-5x86","status":"publish","type":"post","link":"https:\/\/www.karlstechnology.com\/blog\/cyrix-5x86\/","title":{"rendered":"Cyrix 5×86 CPU"},"content":{"rendered":"\n

Cyrix 5×86 (“M1sc”) <\/h3>\n\n\n\n

Despite having the same name as AMD’s 5×86 processor, the Cyrix 5×86<\/a> is a totally different animal. While AMD designed its 5×86 by further increasing the clock on the 486DX4, Cyrix took the opposite approach by modifying its M1 processor core (used for the 6×86 processor) to make a “lite” version to work on 486 motherboards. As such, the Cyrix 5×86 in some ways resembles a Pentium OverDrive (which is a Pentium core modified to work in a 486 motherboard) internally more than it resembles the AMD 5×86. This chip is probably the hardest to classify as either fourth or fifth generation.<\/p>\n\n\n\n

The 5×86 employs several architectural features that are normally found only in fifth-generation designs. The pipeline is extended to six stages, and the internal architecture is 64 bits wide. It has a larger (16 KB) primary cache than the 486DX4 chip. It uses branch prediction to improve performance.<\/p>\n\n\n\n

The 5×86 was available in two speeds, 100 and 120 MHz. The 5×86-120 is the most powerful chip that will run in a 486 motherboard–it offers performance comparable to a Pentium 90 or 100. The 5×86 is still a clock-tripled design, so it runs in 33 and 40 MHz motherboards. (The 100 MHz version will actually run at 50×2 as well, but normally was run at 33 MHz.) It is a 3 volt design and is intended for a Socket 3 motherboard. It will run in an earlier 486 socket if a voltage regulator is used. I have heard that some motherboards will not run this chip properly so you may need to check with Cyrix if trying to use this chip in an older board. These chips have been discontinued by Cyrix but are still good performers, and for those with a compatible motherboard, as good as you can get. Unfortunately, they are extremely difficult to find now.<\/p>\n\n\n\n

Look here for an explanation of the categories in the processor summary table below, including links to more detailed explanations.<\/p>\n\n\n\n\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

General\n Information<\/b><\/font><\/td>\n

Manufacturer<\/b><\/font><\/td>\n

Cyrix<\/font><\/td>\n <\/tr>\n

Family Name<\/b><\/font><\/td>\n

5×86<\/font><\/td>\n <\/tr>\n

Code name<\/b><\/font><\/td>\n

"M1sc"<\/font><\/td>\n <\/tr>\n

Processor Generation<\/b><\/font><\/td>\n

Fourth<\/font><\/td>\n <\/tr>\n

Motherboard\n Generation<\/b><\/font><\/td>\n

Fourth<\/font><\/td>\n <\/tr>\n

Version<\/b><\/font><\/td>\n

5×86-100<\/font><\/td>\n

5×86-120<\/font><\/td>\n <\/tr>\n

Introduced<\/b><\/font><\/td>\n

1996?<\/font><\/td>\n <\/tr>\n

Variants and Licensed\n Equivalents<\/b><\/font><\/td>\n

—<\/font><\/td>\n <\/tr>\n

Speed\n Specifications<\/b><\/font><\/td>\n

Memory Bus Speed\n (MHz)<\/b><\/font><\/td>\n

33 \/ 50<\/font><\/td>\n

40<\/font><\/td>\n <\/tr>\n

Processor Clock\n Multiplier<\/b><\/font><\/td>\n

3.0 \/ 2.0<\/font><\/td>\n

3.0<\/font><\/td>\n <\/tr>\n

Processor Speed (MHz)<\/b><\/font><\/td>\n

100<\/font><\/td>\n

120<\/font><\/td>\n <\/tr>\n

"P" Rating<\/b><\/font><\/td>\n

P75<\/font><\/td>\n

P90<\/font><\/td>\n <\/tr>\n

Benchmarks<\/b><\/font><\/td>\n

iCOMP Rating<\/b><\/font><\/td>\n

~610<\/font><\/td>\n

~735<\/font><\/td>\n <\/tr>\n

iCOMP 2.0 Rating<\/b><\/font><\/td>\n

~67<\/font><\/td>\n

~81<\/font><\/td>\n <\/tr>\n

Norton SI<\/b><\/font><\/td>\n

264<\/font><\/td>\n

316<\/font><\/td>\n <\/tr>\n

Norton SI32<\/b><\/font><\/td>\n

~16<\/font><\/td>\n

19<\/font><\/td>\n <\/tr>\n

CPUmark32<\/b><\/font><\/td>\n

~150<\/font><\/td>\n

~180<\/font><\/td>\n <\/tr>\n

Physical\n Characteristics<\/b><\/font><\/td>\n

Process Technology<\/b><\/font><\/td>\n

CMOS<\/font><\/td>\n <\/tr>\n

Circuit Size\n (microns)<\/b><\/font><\/td>\n

0.65<\/font><\/td>\n <\/tr>\n

Die Size (mm^2)<\/b><\/font><\/td>\n

144<\/font><\/td>\n <\/tr>\n

Transistors\n (millions)<\/b><\/font><\/td>\n

2.0<\/font><\/td>\n <\/tr>\n

Voltage,\n Power and Cooling<\/b><\/font><\/td>\n

External or I\/O\n Voltage (V)<\/b><\/font><\/td>\n

3.45<\/font><\/td>\n <\/tr>\n

Internal or Core\n Voltage (V)<\/b><\/font><\/td>\n

3.45<\/font><\/td>\n <\/tr>\n

Power Management<\/b><\/font><\/td>\n

SMM<\/font><\/td>\n <\/tr>\n

Cooling Requirements<\/b><\/font><\/td>\n

Active heat sink<\/font><\/td>\n <\/tr>\n

Packaging<\/b><\/font><\/td>\n

Packaging Style<\/b><\/font><\/td>\n

168-Pin PGA<\/font><\/td>\n <\/tr>\n

Motherboard Interface<\/b><\/font><\/td>\n

Socket 3; or 168-Pin Socket,\n Socket 1, Socket 2 (with voltage regulator)<\/font><\/td>\n <\/tr>\n

External\n Architecture<\/b><\/font><\/td>\n

Data Bus Width (bits)<\/b><\/font><\/td>\n

32<\/font><\/td>\n <\/tr>\n

Maximum Data Bus\n Bandwidth (Mbytes\/sec)<\/b><\/font><\/td>\n

127.2<\/font><\/td>\n

152.6<\/font><\/td>\n <\/tr>\n

Address Bus Width\n (bits)<\/b><\/font><\/td>\n

32<\/font><\/td>\n <\/tr>\n

Maximum Addressable\n Memory<\/b><\/font><\/td>\n

4 GB<\/font><\/td>\n <\/tr>\n

Level 2 Cache Type<\/b><\/font><\/td>\n

Motherboard<\/font><\/td>\n <\/tr>\n

Level 2 Cache Size<\/b><\/font><\/td>\n

Usually 256 KB<\/font><\/td>\n <\/tr>\n

Level 2 Cache Bus\n Speed<\/b><\/font><\/td>\n

Same as Memory Bus<\/font><\/td>\n <\/tr>\n

Multiprocessing<\/b><\/font><\/td>\n

No<\/font><\/td>\n <\/tr>\n

Internal\n Architecture<\/b><\/font><\/td>\n

Instruction Set<\/b><\/font><\/td>\n

x86<\/font><\/td>\n <\/tr>\n

MMX Support<\/b><\/font><\/td>\n

No<\/font><\/td>\n <\/tr>\n

Processor Modes<\/b><\/font><\/td>\n

Real, Protected, Virtual Real<\/font><\/td>\n <\/tr>\n

x86 Execution Method<\/b><\/font><\/td>\n

Native<\/font><\/td>\n <\/tr>\n

Internal\n Components<\/b><\/font><\/td>\n

Register Size (bits)<\/b><\/font><\/td>\n

32<\/font><\/td>\n <\/tr>\n

Pipeline Depth\n (stages)<\/b><\/font><\/td>\n

6<\/font><\/td>\n <\/tr>\n

Level 1 Cache Size<\/b><\/font><\/td>\n

16 KB Unified<\/font><\/td>\n <\/tr>\n

Level 1 Cache Mapping<\/b><\/font><\/td>\n

4-Way Set Associative<\/font><\/td>\n <\/tr>\n

Level 1 Cache Write\n Policy<\/b><\/font><\/td>\n

Write-Through, Write-Back<\/font><\/td>\n <\/tr>\n

Integer Units<\/b><\/font><\/td>\n

1<\/font><\/td>\n <\/tr>\n

Floating Point Unit \/\n Math Coprocessor<\/b><\/font><\/td>\n

Integrated<\/font><\/td>\n <\/tr>\n

Instruction Decoders<\/b><\/font><\/td>\n

1<\/font><\/td>\n <\/tr>\n

Branch Prediction\n Buffer Size \/ Accuracy<\/b><\/font><\/td>\n

!? entries \/ !? %<\/font><\/td>\n <\/tr>\n

Write Buffers<\/b><\/font><\/td>\n

!?<\/font><\/td>\n <\/tr>\n

Performance Enhancing\n Features<\/b><\/font><\/td>\n

—<\/font><\/td>\n <\/tr>\n<\/table>\n\n\n\n

\n\n\n\n
The PC Guide<\/strong>
Site Version: 2.2.0 – Version Date: April 17, 2001
\u00a9 Copyright 1997-2004 Charles M. Kozierok. All Rights Reserved.<\/td><\/tr><\/tbody><\/table>\n\n\n\n
\n\n\n\n

This is an archive of Charles M. Kozierok’s PCGuide (pcguide.com) which disappeared from the internet in 2018. We wanted to preserve Charles M. Kozierok’s knowledge about computers and are permanently hosting a selection of important pages from PCGuide.<\/p>\n","protected":false},"excerpt":{"rendered":"

Cyrix 5×86 (“M1sc”) Despite having the same name as AMD’s 5×86 processor, the Cyrix 5×86 is a totally different animal. While AMD designed its 5×86 by further increasing the clock on the 486DX4, Cyrix took the opposite approach by modifying its M1 processor core (used for the 6×86 processor) to make a “lite” version to […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[16,48],"class_list":["post-425","post","type-post","status-publish","format-standard","hentry","category-computerrepair","tag-computer-repair","tag-pcguide"],"yoast_head":"\nCyrix 5x86 CPU - Computer Repair Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.karlstechnology.com\/blog\/cyrix-5x86\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cyrix 5x86 CPU - Computer Repair Blog\" \/>\n<meta property=\"og:description\" content=\"Cyrix 5×86 (“M1sc”) Despite having the same name as AMD’s 5×86 processor, the Cyrix 5×86 is a totally different animal. 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