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Full Version: MemTest86 V4.3.1 / V5.0 Beta - (8 Aug 2013)
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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.

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Quote:Version 4.3.1 8/Aug/2013
* Fixed bug with Test 6 (Block Move Test) not testing the end of a memory segment correctly
* Removed unnecessary boot options in menu

Version 5.0 Beta release for UEFI 22/Jul/2013
* Completely re-written to work under UEFI.
* Native 64-bit support
* No longer requires the use of the PAE workaround to access more than 4GB of memory. (PAE = Physical Address Extension)
* Mouse support, where supported by the underlying UEFI system. On older systems a keyboard is still required.
* Improved USB keyboard support. The keyboard now works on systems that fail to emulate IO Port 64/60 correctly. So Mac USB keyboards are now supported.
* Improved multi-threading support, where supported by the underlying UEFI system.
* Dual boot with Memtest version 4 for supporting older systems without UEFI. So with a single USB or CD drive both UEFI systems and BIOS systems can be supported.
* Reporting of detailed RAM SPD information. Timings, clock speeds, vendor names and much more.
* Support to writing to the USB drive that Memtest is running from for logging and report generation. In all prior MemTest releases there was no disk support.
Use of GPT. (GUID Partition Table)
For more details see the MemTest86 forum

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thanks i love memtest
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