Memtest86

**stasio** · 02-02-2009, 04:36 AM

Memtest86 Release 3.5

* Limited support for execution with multiple CPUs. CPUs are selected round-robin or sequential for each test.
* Support for detection of additional chipsets. (from Memtest86+ v2.11).
* Additions and corrections for CPU detection including reporting of L3 cache.
* Reworked information display for better readability and new information.
* Abbreviated iterations for first pass.
* Enhancements to memory sizing.
* Misc bug fixes.

Memtest86 3.5-iso

Another package here

**stasio** · 11-24-2010, 01:06 PM

Memtest86 3.5a

http://www.memtest86.com/memtest86-3.5a.iso.zip

Version 3.5a corrects a bug in 3.5 that prevented testing more than 4Gb of memory. Version 3.5a now works with up to 64Gb of memory.

**Spyrus** · 11-24-2010, 11:50 PM

I use the http://www.memtest.org/ '+' version since i thought that original has been stopped.
Is this updated now? Should i replace it against '+'?

**stasio** · 11-25-2010, 02:32 AM

Originally Posted by Spyrus

I use the http://www.memtest.org/ '+' version since i thought that original has been stopped.
Is this updated now? Should i replace it against '+'?

This is two different software.
Btw,
latest stable is Memtest86+ v4.10 and latest beta is
Memtest86+ v4.15b2.

**stasio** · 03-20-2011, 04:23 PM

Memtest86 3.5b

http://www.memtest86.com/memtest86-3.5b.iso.zip

ISO's include a boot menu that allows selection of version 3.5b and version 3.4.Version 3.5b includes a number of fixes from the 4.0 release that corrects all of the know issues with testing more than 4 GB of memory.

Memtest86 is a standalone program that does not require or use any operating system for execution. The version of Windows or Linux being used is irrelavent for execution. However, you must use Windows or Linux to create a bootable CD, Floppy or USB key. The Windows and Linux packages are identical except for the installation methods. Memtest86 supports 64 bit CPUs.

Memtest86 4.0 beta 2

http://www.memtest86.com/memtest86-4.0b2.iso.zip

v4.0 beta 2 19-Mar-2011
* Added support for "default" SMP configurations.
* Fixed a couple additional issues for testing beyond 4 GB.

v4.0 beta 5-Mar-2011
* Support for testing with multiple CPUs. All tests except for #11 (Bit Fade) have been multi-threaded. A maximum of 16 CPUs will be used for testing.
* CPU detection has been completely re-written to use the brand ID string rather than the cumbersome, difficult to maintain and often out of date CPUID family information. All new processors will now be correctly identified without requiring code support.
* All code related to controller identification, PCI and DMI has been removed. This may be a controversial decision and was not made lightly. The following are justifications for the decision:
1. Controller identification has nothing to do with actual testing of memory, the core purpose of Memtest86.
2. This code needed to be updated with every new chipset. With the ever growing number of chipsets it is not possible to keep up with the changes. The result is that new chipsets were more often than not reported in-correctly. In the authors opinion incorrect information is worse than no information.
3. Probing for chipset information carries the risk of making the program crash.
4. The amount of code involved with controller identification was quite large, making support more difficult.
Removing this code also had the unfortunate effect of removing reporting of correctable ECC errors. The code to support ECC was hopelessly intertwined the controller identification code. A fresh, streamlined implementation of ECC reporting is planned for a future release.
* A surprising number of conditions existed that potentially cause problems when testing more than 4 GB of memory. Most if not all of these conditions have been identified and corrected.
* A number of cases were corrected where not all of memory was being tested. For most tests the last word of each test block was not tested. In addition an error in the paging code was fixed that omitted from testing the last 256 bytes of each block above 2 GB.
* The information display has been simplified and a number of details that were not relevant to testing were removed.
* Memory speed measurement has been parallelized for more accurate reporting for multi channel memory controllers.
* This is a major re-write of the Memtest86 with a large number of minor bug-fixes and substantial cleanup and re-organization of the code.

**stasio** · 04-02-2011, 03:49 PM

Memtest86 4.0

http://www.memtest86.com/memtest86-4.0.iso.zip

Support for testing with multiple CPUs. All tests except for #11 (Bit Fade) have been multi-threaded. A maximum of 16 CPUs will be used for testing.
CPU detection has been completely re-written to use the brand ID string rather than the cumbersome, difficult to maintain and often out of date CPUID family information. All new processors will now be correctly identified without requiring code support.
All code related to controller identification, PCI and DMI has been removed. This may be a controversial decision and was not made lightly. The following are justifications for the decision:
1. Controller identification has nothing to do with actual testing of memory, the core purpose of Memtest86.
2. This code needed to be updated with every new chipset. With the ever growing number of chipsets it is not possible to keep up with the changes. The result is that new chipsets were more often than not reported in-correctly. In the authors opinion incorrect information is worse than no information.
3. Probing for chipset information carries the risk of making the program crash.
4. The amount of code involved with controller identification was quite large, making support more difficult.
Removing this code also had the unfortunate effect of removing reporting of correctable ECC errors. The code to support ECC was hopelessly intertwined the controller identification code. A fresh, streamlined implementation of ECC reporting is planned for a future release.
A surprising number of conditions existed that potentially cause problems when testing more than 4 GB of memory. Most if not all of these conditions have been identified and corrected.
A number of cases were corrected where not all of memory was being tested. For most tests the last word of each test block was not tested. In addition an error in the paging code was fixed that omitted from testing the last 256 bytes of each block above 2 GB.
The information display has been simplified and a number of details that were not relevant to testing were removed.
Memory speed measurement has been parallelized for more accurate reporting for multi channel memory controllers.
This is a major re-write of the Memtest86 with a large number of minor bug-fixes and substantial cleanup and re-organization of the code.

**stasio** · 10-28-2011, 03:43 PM

Memtest86 4.0b

http://www.memtest86.com/memtest86-4.0s.iso.zip

Enable extended addressing to allow for testing of up to 8 TB of memory.
Increased maximum CPUs from 16 to 32
Improved spinlock performance to reduce contention
Improved cpu identification (CPUID) code