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| LATEST VERSION : 5.31b | LAST UPDATE : 12/04/2020 |
Based on the well-known original memtest86 written by Chris Brady, memtest86+ is a port by some members of the x86-secret team, now working at www.canardpc.com. Our goal is to provide an up-to-date and completly reliable version of this software tool aimed at memory failures detection. Memtest86+ was, is and will always be a free, open-source software.
The original Memtest86 is now handled by PassMark® Software Pty Ltd.
Memtest86+ is released under the terms of the Gnu Public License (GPL). No restrictions for use, private or commercial exist other than the ones mentioned in the Gnu Public License (GPL). Texts about the original version was taken from the original website and written by Chris Brady.
PS : A newsletter for memtest86+ updates is available / Donation for Memtest86+ welcome. Please support free GPL software.
- About Memtest86+
- About the original Memtest86 (Unchanged)
- About tests performed
- About the authors & contributors
The first version of Memtest86+ was released on early 2004, based on memtest86 v3.0 that was not updated since mid-2002. Our main challenge was to provide an up-to-date version of this useful tool, as reliable than the original. Our work started when we got the first AMD64 system. Unfortunatly, the original memtest v3.0 didn't run at all. After looking at the source code, we fixed the bug.After some days, I saw lot of other things like chipsets or CPU that were not correctly detected or not detected at all. As I'm the chief-editor of a french hardware website (www.x86-secret.com now integrated into www.canardpc.com), I have access to lot of recent hardware and I can test and debug on quite all available motherboards on the market. After adding detection for all current CPUs, I've added detection for all current chipsets (SiS, VIA, nVidia, Intel) and ECC Polling for AMD64, i875P and E7205. Then, I decided to display some useful settings for the most popular chipsets. For exemple, on i865PE/i875P series, memtest86+ will now display FSB & Memory frequency, PAT status, memory timings, ECC status and the number of memory channels. Next version will perhaps contain several enhancements and bug-fixes.
-= Change Log =-Here is all the latest change logs for memtest86+ :
*** Enhancements in v5.31b : ***
After a long hiatus without updates and following numerous requests, I've started compiling many codes branches to release public builds again! Here is Memtest86+ 5.31b, with many bug fixes in the core functions. This build is not ready for production yet, because it lacks some feedbacks from beta-testers. Additional features and updated detection code will follow soon, as soon I have access to my lab with all the reference test platforms. It's currently inaccessible due to the COVID19 lockdown.
If you find a bug or regression in this build, please send your feedback to memtest (-A-) memtest.org. Thank you!
Enhancements in v5.01 :
- Added support for up to 2 TB of RAM on X64 CPUs
- Added experimental SMT support up to 32 cores (Press F2 to enable at startup)
- Added complete detection for memory controllers
- Added Motherboard Manufacturer & Model reporting
- Added CPU temperature reporting
- Added enhanced Fail Safe Mode (Press F1 at startup)
- Added support for Intel 'Sandy Bridge-E' CPUs
- Added support for Intel 'Ivy Bridge' CPUs
- Added preliminary support for Intel 'Haswell' CPUs (Core 4th Gen)
- Added preliminary support for Intel 'Haswell-ULT' CPUs
- Added support for AMD 'Kabini' (K16) CPUs
- Added support for AMD 'Bulldozer' CPUs
- Added support for AMD 'Trinity' CPUs
- Added support for AMD E-/C-/G-/Z- 'Bobcat' CPUs
- Added support for Intel Atom 'Pineview' CPUs
- Added support for Intel Atom 'Cedar Trail' CPUs
- Added SPD detection on most AMD Chipsets
- Enforced Coreboot support
- Optimized run time for faster memory error detection
- Rewriten lots of memory timings detection cod
- Corrected bugs, bugs and more bugs (some could remain)
Enhancements in v4.20 :
- Added failsafe mode (press F1 at startup)
- Added support for Intel 'Sandy Bridge' CPU
- Added support for AMD 'fusion' CPU
- Corrected some memory brands not detected properlyt
- Various bug fixes
Enhancements in v4.10 :
- Added support for Core i7 Extreme CPU (32nm)
- Added support for Core i5/i3 (32 nm)
- Added support for Pentium Gxxxx (32 mn)
- Added support for Westmere-based Xeont
- Added preliminary support for Intel SNB A0-step
- Added support for AMD 6-cores CPU
- Added detection for Intel 3200/3210
- New installer for USB Key
- Corrected a crash at startup
- Many others bug fixes
Enhancements in v4.00 : Freesplashtop 2 – remote desktop for iphone & ipod.
- Major Architectural changes
- First pass twice faster (reduced iterations)
- Detect DDR2/3 brands and part numbers on Intel DDR2/3 chipsets
- Added detection for Intel 'Clarkdale/Gulftown' CPUt
- Added detection for AMD 'Magny-Cours' CPU
- Added detection for Intel XMP Memory
- Added for CPU w/ 0.5/1.5/3/6/12/16/18/24MB L3
- Added 'clean' DMI detection for DDR3/FBDIMM2
- Corrected detection for Intel 'Lynnfield' CPU
- Corrected detection for AMD 45nm K10 CPU
- Solved crash with AMD Geode LX
- Complies with SMBIOS 2.6.1 specst
- Fixed compilation issues with gcc 4.2+
- Many others bug fixes
PS : Memtest86+ '3.00' was skipped and renamed 4.00 in order to avoid confusion with the original Memtest.
Remotix 5 1 16 Esv
Enhancements in v2.11 :
- Added support for Intel Core i5 (Lynnfield) CPU
- Added support for Intel P55 Southbridge
- Added support for Intel PM45/GM45/GM47 Mobile chipset
- Added support for Intel GL40/GS45 Mobile chipset
- Corrected DDR2/DDR3 detection on Intel x35/x45
- Corrected detection on some Core i7 CPU
- Fixed a bug with some AMI BIOS (freeze at startup)
- Various bug fixes
Enhancements in v2.10 :
- Added support for Intel Core i7 (Nehalem) CU
- Added support for Intel Atom Processors
- Added support for Intel G41/G43/G45 Chipsets
- Added support for Intel P43/P45 Chipsets
- Added support for Intel US15W (Poulsbo) Chipset
- Added support for Intel EP80579 (Tolapai) SoC CPU
- Added support for ICH10 Southbridge (SPD/DMI)
- Added detection for Intel 5000X
- Now fully aware of CPU w/ L3 cache (Core i7 & K10)
- Added workaround for DDR3 DMI detection
- Fixed Intel 5000Z chipset detection
- Fixed Memory Frequency on AMD K10
- Fixed cache detection on C7/Isaiah CPU
- Fix Memtest86+ not recognized as Linux Kernel
Enhancements in v2.01 :
- Added support for i945GM/PM/GME & i946PL/GZ
- Added support for iGM965/iGL960/iPM965/iGME965/iGLE960
- Added detection for SiS 649/656/671/672
- Added detection for i430MX/i430TX
- Added an optional beep mode (pass completed w/o error)
- Pass duration 20% reduced
- Removed the blinking cursor
- Reverted Test #0 to cached
- Solved a major bug in Memory Address Errors Reporting
- Patched for Intel-Powered Mac
- Corrected Intel 3-Series (P35/X38) chipset init
- Corrected a bug with SPD Display and ESB6300
- Correct a detection bug on P965/G965 C-Stepping
- Solved a incoherency with pass progress indicator
- Patched Makefile to compile on x86_64
- Bootable Memtest86+ ISO more compatible
Enhancements in v2.00 :
- Major Architectures changes
- Modulo test now use random pattern for better accuracy
- Added Advanced DMI Errors Reporting Mode
- Added support for bus ratio changes on Intel Core CPU
- Added support for non-integer bus ratio on latest Intel CPU
- Added SPD Data Display for all Intel Chipsets (more to come)
- Added serial support as a linux boot parameter (Thanks to Michal S.)
- Added preliminary support for VIA CN Isaiah CPU
- Added preliminary support for Intel Nehalem
- Added support for VIA C7/C7-D/C7-M/Eden on Esther Core
- Added support for AMD K10 (Phenom) CPU w/ timings detection
- Added support for Intel Pentium E w/ 1 MB L2 Cache
- Added support for Intel Core 2 45nm (Penryn)
- Added support for FSB1333/FSB1600 Intel CPU
- Added support for Intel 5400A/5400B w/ timings detection
- Added support for Intel Q35/P35/G33/Q33 w/ timings detection
- Added support for Intel X38/X48 w/ timings detection
- Added preliminary support for Intel 5000P/V/Z
- Removed on-fly memory timings change (unstable)
- Numerous (really) bug fixes
Screenflow 7 2 – create screen recordings without. Some screenshots of memtest86+ on third recent platforms (i865/i875 - nForce2 - AMD64) :
Memtest86+ V1.00 on nForce2 |
Here is some pre-compiled distributions of memtest86+. Memtest86+ comes in three different way, first is a pre-build bootable ISO, second is a bootable binary and third an installable package for creating a bootable floppy. Third version are compressed in .zip and .tar.gz.
** Memtest86+ V5.31b (12/04/2020)**
* Memtest86+ V5.01 (27/09/2013) *
After a long hiatus without updates and following numerous requests, I've started compiling many codes branches to release public builds again! Here is Memtest86+ 5.31b, with many bug fixes in the core functions. This build is not ready for production yet, because it lacks some feedbacks from beta-testers. Additional features and updated detection code will follow soon, as soon I have access to my lab with all the reference test platforms. It's currently inaccessible due to the COVID19 lockdown.
If you find a bug or regression in this build, please send your feedback to memtest (-A-) memtest.org. Thank you!
Enhancements in v5.01 :
- Added support for up to 2 TB of RAM on X64 CPUs
- Added experimental SMT support up to 32 cores (Press F2 to enable at startup)
- Added complete detection for memory controllers
- Added Motherboard Manufacturer & Model reporting
- Added CPU temperature reporting
- Added enhanced Fail Safe Mode (Press F1 at startup)
- Added support for Intel 'Sandy Bridge-E' CPUs
- Added support for Intel 'Ivy Bridge' CPUs
- Added preliminary support for Intel 'Haswell' CPUs (Core 4th Gen)
- Added preliminary support for Intel 'Haswell-ULT' CPUs
- Added support for AMD 'Kabini' (K16) CPUs
- Added support for AMD 'Bulldozer' CPUs
- Added support for AMD 'Trinity' CPUs
- Added support for AMD E-/C-/G-/Z- 'Bobcat' CPUs
- Added support for Intel Atom 'Pineview' CPUs
- Added support for Intel Atom 'Cedar Trail' CPUs
- Added SPD detection on most AMD Chipsets
- Enforced Coreboot support
- Optimized run time for faster memory error detection
- Rewriten lots of memory timings detection cod
- Corrected bugs, bugs and more bugs (some could remain)
Enhancements in v4.20 :
- Added failsafe mode (press F1 at startup)
- Added support for Intel 'Sandy Bridge' CPU
- Added support for AMD 'fusion' CPU
- Corrected some memory brands not detected properlyt
- Various bug fixes
Enhancements in v4.10 :
- Added support for Core i7 Extreme CPU (32nm)
- Added support for Core i5/i3 (32 nm)
- Added support for Pentium Gxxxx (32 mn)
- Added support for Westmere-based Xeont
- Added preliminary support for Intel SNB A0-step
- Added support for AMD 6-cores CPU
- Added detection for Intel 3200/3210
- New installer for USB Key
- Corrected a crash at startup
- Many others bug fixes
Enhancements in v4.00 : Freesplashtop 2 – remote desktop for iphone & ipod.
- Major Architectural changes
- First pass twice faster (reduced iterations)
- Detect DDR2/3 brands and part numbers on Intel DDR2/3 chipsets
- Added detection for Intel 'Clarkdale/Gulftown' CPUt
- Added detection for AMD 'Magny-Cours' CPU
- Added detection for Intel XMP Memory
- Added for CPU w/ 0.5/1.5/3/6/12/16/18/24MB L3
- Added 'clean' DMI detection for DDR3/FBDIMM2
- Corrected detection for Intel 'Lynnfield' CPU
- Corrected detection for AMD 45nm K10 CPU
- Solved crash with AMD Geode LX
- Complies with SMBIOS 2.6.1 specst
- Fixed compilation issues with gcc 4.2+
- Many others bug fixes
PS : Memtest86+ '3.00' was skipped and renamed 4.00 in order to avoid confusion with the original Memtest.
Remotix 5 1 16 Esv
Enhancements in v2.11 :
- Added support for Intel Core i5 (Lynnfield) CPU
- Added support for Intel P55 Southbridge
- Added support for Intel PM45/GM45/GM47 Mobile chipset
- Added support for Intel GL40/GS45 Mobile chipset
- Corrected DDR2/DDR3 detection on Intel x35/x45
- Corrected detection on some Core i7 CPU
- Fixed a bug with some AMI BIOS (freeze at startup)
- Various bug fixes
Enhancements in v2.10 :
- Added support for Intel Core i7 (Nehalem) CU
- Added support for Intel Atom Processors
- Added support for Intel G41/G43/G45 Chipsets
- Added support for Intel P43/P45 Chipsets
- Added support for Intel US15W (Poulsbo) Chipset
- Added support for Intel EP80579 (Tolapai) SoC CPU
- Added support for ICH10 Southbridge (SPD/DMI)
- Added detection for Intel 5000X
- Now fully aware of CPU w/ L3 cache (Core i7 & K10)
- Added workaround for DDR3 DMI detection
- Fixed Intel 5000Z chipset detection
- Fixed Memory Frequency on AMD K10
- Fixed cache detection on C7/Isaiah CPU
- Fix Memtest86+ not recognized as Linux Kernel
Enhancements in v2.01 :
- Added support for i945GM/PM/GME & i946PL/GZ
- Added support for iGM965/iGL960/iPM965/iGME965/iGLE960
- Added detection for SiS 649/656/671/672
- Added detection for i430MX/i430TX
- Added an optional beep mode (pass completed w/o error)
- Pass duration 20% reduced
- Removed the blinking cursor
- Reverted Test #0 to cached
- Solved a major bug in Memory Address Errors Reporting
- Patched for Intel-Powered Mac
- Corrected Intel 3-Series (P35/X38) chipset init
- Corrected a bug with SPD Display and ESB6300
- Correct a detection bug on P965/G965 C-Stepping
- Solved a incoherency with pass progress indicator
- Patched Makefile to compile on x86_64
- Bootable Memtest86+ ISO more compatible
Enhancements in v2.00 :
- Major Architectures changes
- Modulo test now use random pattern for better accuracy
- Added Advanced DMI Errors Reporting Mode
- Added support for bus ratio changes on Intel Core CPU
- Added support for non-integer bus ratio on latest Intel CPU
- Added SPD Data Display for all Intel Chipsets (more to come)
- Added serial support as a linux boot parameter (Thanks to Michal S.)
- Added preliminary support for VIA CN Isaiah CPU
- Added preliminary support for Intel Nehalem
- Added support for VIA C7/C7-D/C7-M/Eden on Esther Core
- Added support for AMD K10 (Phenom) CPU w/ timings detection
- Added support for Intel Pentium E w/ 1 MB L2 Cache
- Added support for Intel Core 2 45nm (Penryn)
- Added support for FSB1333/FSB1600 Intel CPU
- Added support for Intel 5400A/5400B w/ timings detection
- Added support for Intel Q35/P35/G33/Q33 w/ timings detection
- Added support for Intel X38/X48 w/ timings detection
- Added preliminary support for Intel 5000P/V/Z
- Removed on-fly memory timings change (unstable)
- Numerous (really) bug fixes
Screenflow 7 2 – create screen recordings without. Some screenshots of memtest86+ on third recent platforms (i865/i875 - nForce2 - AMD64) :
Memtest86+ V1.00 on nForce2 |
Here is some pre-compiled distributions of memtest86+. Memtest86+ comes in three different way, first is a pre-build bootable ISO, second is a bootable binary and third an installable package for creating a bootable floppy. Third version are compressed in .zip and .tar.gz.
** Memtest86+ V5.31b (12/04/2020)**
* Memtest86+ V5.01 (27/09/2013) *
* Memtest86+ V4.20 (25/01/2011) *
* Memtest86+ V4.10 (04/05/2010) *
* Memtest86+ V4.00 (22/09/2009) *
* Memtest86+ V2.11 (22/12/2008) *
* Memtest86+ V2.10 (15/11/2008) *
* Memtest86+ V2.01 (21/02/2008) *
* Memtest86+ V2.00 (08/02/2008) *
-= Download (Source Code) =-Here is the source code (under GPL) :
** Memtest86+ V5.31b (12/04/2020) **
- Download - Memtest86+ V5.31b source code (.tar.gz) - 223 KB
* Memtest86+ V5.01 (27/09/2013) *
- Download - Memtest86+ V5.01 source code (.tar.gz) - 209.3 KB
* Memtest86+ V4.20 (25/01/2011) *
- Download - Memtest86+ V4.10 source code (.tar.gz) - 263.1 KB
* Memtest86+ V4.10 (04/05/2010) *
- Download - Memtest86+ V4.10 source code (.tar.gz) - 263.1 KB
* Memtest86+ V4.00 (22/09/2009) *
- Download - Memtest86+ V4.00 source code (.tar.gz) - 263.1 KB
* Memtest86+ V2.11 (22/12/2008) *
- Download - Memtest86+ V2.11 source code (.tar.gz) - 139.8 KB
* Memtest86+ V2.10 (15/11/2008) *
- Download - Memtest86+ V2.10 source code (.tar.gz) - 139.8 KB
* Memtest86+ V2.01 (21/02/2008) *
- Download - Memtest86+ V2.01 source code (.tar.gz) - 139.8 KB
* Memtest86+ V2.00 (08/02/2008) *
- Download - Memtest86+ V2.00 source code (.tar.gz) - 139.8 KB
Memtest86+ is written by Samuel DEMEULEMEESTER, chief editor of www.x86-secret.com (visit us). You can send an email to memtest[nospam]@memtest.org (sorry for the syntax, remove [nospam]). But don't expect an answer..
PS : Again, the original author of memtest86 is Chris Brady (www.memtest86.com)
-= Contributors of Memtest86/Memtest86+ =-The initial versions of the source files bootsect.S, setup.S, head.S and build.c are from the Linux 1.2.1 kernel and have been heavily modified.
Doug Sisk provided code to support a console connected via a serial port.
Silkypix mac. Code to create BadRAM patterns was provided by Rick van Rein.
Remotix 5 1 16 Equals
Screen buffer code was provided by Jani Averbach.
On-fly timings change for A64/i865/915 was provided by Eric and Wee
Eric Biederman reworked the build process making it far simpler and also to produce a network bootable ELF image. He produce a nice patch in mid-2003 which was included in memtest86+
Memtest86+ Loader (and lots of help) was provided by Eric Auer.
Udo Rader create a piece of code for better badram support (remove duplicate)
Thanks to Franck Delattre (www.cpuid.org) for his help.
Thanks to Michal Schmidt, Yann D. and Warren Togami for unvaluable support
Thanks to Remko van der Vossen (aka Wichetael) for the FAQ
Remotix 5 1 16 Inch
Thanks to CDH for his help.
Thanks to lechenejb for memtest86+ logo.
Thanks to all 5.xx contributors, especially Passmark guys.
Thanks to all Beta-testers.
-= Donation for Memtest86+ =-We occasionally receive email that ask for a doantion, so, here is the donation section ! So, if you've found memtest86+ useful - maybe it saved you some money or helped you to understand an issue that's been bothering you for ages - then please consider making a donation to support free software and help us face costs that occur (webhosting, buying of some hardware for debugging, ..etc). Don't forget donations are very welcome, but by no means required. However, they will directly increases the amount of time we can spend on developing mt86+. Any amount is greatly appreciated.
Remotix 5 1 16 Mm
As an individual, your name will be asked in the Paypal's form and it will be added to this page as a mt86+ donator. Due to numerous abuses, we reserve the right to remove companies' names, especially when they are not related to IT. We only accept true donations. We don't sell links on our website for SEO purposes!
Donators List (Thank you !) :
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