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 Home » OlderGeeks.com Freeware Downloads » Hardware Testing and Diagnostics » Memtest86 Free v8.1 Windows/Linux/Mac USB image   
File - Download Memtest86 Free v8.1 Windows/Linux/Mac USB image
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Memtest86 Free v8.1 Windows/Linux/Mac USB image

MemTest86 is a free, thorough, stand alone memory test for x86 architecture computers.

There are many good approaches for testing memory. However, many tests simply throw some patterns at memory without much thought or knowledge of memory architecture or how errors can best be detected. This works fine for hard memory failures but does little to find intermittent errors. BIOS based memory tests are useless for finding intermittent memory errors.

RAM chips consist of a large array of tightly packed memory cells, one for each bit of data. The vast majority of the intermittent failures are a result of interaction between these memory cells. Often writing a memory cell can cause one of the adjacent cells to be written with the same data. An effective memory test attempts to test for this condition. Therefore, an ideal strategy for testing memory would be the following:

Write a cell with a zero.
Write all of the adjacent cells with a one, one or more times.
Check that the first cell still has a zero.
It should be obvious that this strategy requires an exact knowledge of how the memory cells are laid out on the chip. In addition there are a never ending number of possible chip layouts for different chip types and manufacturers making this strategy impractical. However, there are testing algorithms that can approximate this ideal and MemTest86 does just this.

Notes:

IMPORTANT: MemTest86 V8 images support only UEFI boot. On machines that don't support UEFI, MemTest86 will not boot. Please download the older V4 BIOS release for CD or V4 BIOS release for USB of MemTest86 instead.
Installation and usage instructions are available on the Technical Information page
MemTest86 is a stand-alone program that does not require or use any operating system for execution. The version of Windows, Linux, or Mac being used is irrelevant for execution. However, you must use either Windows, Linux or Mac to create a bootable USB drive.

System Requirements

x86 based hardware, 32bit or 64bit
UEFI platform firmware
Windows, Linux, or Mac OS
USB Flash Drive (>= 512MB capacity)

Changes:
Version 8.1 4/Jan/2019

Fixes/Enhancements

Added version information and total CPU threads to test summary screen
Increased maximum number of CPU threads to 256
Added text colour to error messages during testing
Added Mac Mini 2018 to blacklist which sets the lower address limit to 0x1000 by default
Fixed bug in detection of hyperthreads when the number of CPU threads exceeds the maximum
Fixed incorrect JEDEC manufacture names (Bank 10)
Fixed missing RAM part number / serial number obtained from SMBIOS in HTML report
Fixed incorrect channel/slot number for ECC errors on Skylake-SP chipsets
Fixed bug in specifying the number of test passes for Free version




















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Downloads Views Developer Last Update Version Size Type Rank
2,222 6,660 Passmark Software <img src="https://www.oldergeeks.com/downloads/gallery/thumbs/memtest_mainmenu_th.png"border="0"> May 31, 2019 - 12:02 8.1 8.53MB ZIP 5/5, out of 27 Votes.
File Tags
Memtest86  Free  USB  image  v8.1  Windows/Linux/Mac  
   

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