do you trust more of memtest86 or memetest86+ ?
Pro edition of MemTest86 pre-installed and ready to use for the flash drive option Support for booting on the UEFI platform An extensive user guide with simple step-by-step instructions for using MemTest86 to diagnose and troubleshoot PC memory problems Free software updates for 12 months Detailed instructions for using MemTest86 to safely over-clock your PC All online orders are done securely, your personal details will never be disclosed and orders will be processed in under 12 hours usually immediately. Site Edition Licensing Site Edition covers an unlimited number of users within a single organization in a single country. Upgrades Upgrades are free for 12 months after a purchase. After the 12 months period you can purchase additional support to continue to get new software. You can login here to get the latest download or extend support.
Memtest86 Pro 8.0.1000 (CD/USB)
Several of the changes include: But never the type to blindly accept test results, strange testing outcomes led us to discover a bug in MemTest86 affecting computers running the new EFI firmware.
But there is good news: A program that provides robust testing of your computer’s memory. MemTest86 is made and maintained by PassMark Software.
Boot into the device on which you installed MemTest86 and the software will run the tests automatically. The first 10 tests — tests number 0 through 9 — are straightforward: Tests number 11 and 12 also exhibit this behavior, but are more tailored to specific processor architectures i. The tests in which we are particularly interested are tests number 10 and The goal of test 10 is to see if your memory modules can hold their value over a span of time.
For each section of memory that is currently being tested, MemTest86 performs two steps. MemTest86 will write all zeros to the section of memory, wait five minutes, and then read all the addresses to see if any of the data changed.
The second step is mostly the same as the first step, except that MemTest86 writes all ones instead of all zeros. A single pass of this test can take several minutes to several hours to complete depending on how much memory is in your computer.
Test 13 is generally much faster than test The goal of test 13 is to determine if your memory modules have a defect that is present in memory modules released after This test writes a random pattern of bits to a range of memory addresses and then repeatedly reads two memory addresses. This repeated reading action can cause some of the tested memory addresses to change in value if your memory is defective.
Two of the MacBook Airs passed the tests with no issues, while the other three Airs and both the Pros would fail spectacularly. Each failing computer would throw at least errors, all of which occurred in a single pass of test Sometimes a computer would fail test 10 multiple times, each time resulting in about errors.
The MacBook Pros would also fail test 13 in such a manner that could cause the test to throw over , errors. We felt that the fact that five of these computers would fail in the same manner every time was not merely a coincidence of these five having bad memory; the results were too spectacular.
We determined that there might be an issue with MemTest86 as well. Browsing through the MemTest86 support forums revealed an interesting fact to us about the software. While the software is robust in its testing, the correctness of the tests can be sometimes at the mercy of factors beyond the condition of the tested memory.
For example, a stick of memory that is tested in one computer could fail some tests, but then that same stick could pass all tests when it is tested in another computer. A potential cause for false errors could be from the firmware interface of the computer system; an example of such a firmware interface would be the EFI system present on recent Apple computers. We know that with the release with macOS When we double checked the EFI versions of the computers in question, all the failing computers had an EFI version that came with or came after the macOS These can identified with the ‘B00’ suffix.
In the first phase of the test, we would have the two MacBook Airs undergo an extended run MemTest In the second phase, we would then install macOS The goal of the second phase was to confirm our suspicions that recent EFI updates for Apple computers would interfere with the performance of MemTest The results from the first phase of the test were promising.
We set the two computers to perform twenty passes of MemTest86 and let them run overnight. When we came back in the morning, we observed that neither of the machines had reported any errors during the testing. We took the results of this phase to mean that neither of the two MacBook Airs had faulty memory and proceeded to the next phase. The results from the second phase were also promising in that the results confirmed our suspicions: While we cannot say for certain what aspect of the EFI update is throwing these errors, we can say with confidence that updating to the newer versions of the EFI will causes errors with MemTest86 when running the tests normally.
A Description of the Failures Of course with these results came the next question: It just so happened that when these computers did fail MemTest86, these computers would fail in a consistent manner for both tests 10 and In the case of test 10 failing, the problematic address ranges were always the same. The failures always occur in the memory address range of 0x00 to 0x In particular, the grand failure is heralded by a few failures that occur in the first stage of this test.
When MemTest86 writes all zeros to the section under test, the addresses of 0x00 and 0x04 tend to fail. When they do fail, we observe that each address fails in the same way e.
Of note, all the values of the data in each address are all zeros, as though MemTest86 was unable to write any data to this memory address. Two errors in the first pattern are followed by errors in the second pattern.
In the case of test 13 failing, the address ranges also appear to be between 0x00 and 0x Much like how the latter portions of test 10 did not appear to write any data to the affected address ranges, test 13 also appears to not write any data to its memory addresses; the expected input is randomized, but the data from the read is all zeroes. There is also an issue with the firmware locking out access to all the processor cores except core zero for this test, though what effect this has on the performance of the test is yet to be determined.
Test 13 in the process of failing. This test is likely to generate several thousand more errors. The Workaround In order to test the memory of an Apple computer that has or has had High Sierra installed, we must let MemTest86 run twice. One of the key features of MemTest86 is that you can select the range of memory on which to perform the tests. When we boot into MemTest86, we will want to go to the configuration menu. Usually the tests will begin automatically, but we can bypass that by pressing any key after the program is loaded.
Lower Limit, Upper Limit, and Reset limits to default. Adjusting these values is how we will be testing the range of memory in chunks. Note that the upper limit will be different from computer to computer and reflects how much memory your computer has. We will be using hexadecimal values when adjusting memory addresses for the tests, which requires us to provide a prefix of 0x before we provide a value. Have caution that if you press xanywhere in the MemTest86 configuration menu that you will exit the program!
But if you pressxwhen adjusting the memory address range values, you should be fine. Run the test. Once the test is finished, you can be certain that any errors reported are valid, though hopefully no such errors occur!
Run the test again and observe the results. Resetting the lower limit to 0x0 and changing the upper limit to 0x This method allows all the tests to perform over the entire range of memory within the Apple computer.
We have yet to encounter any false errors when using this test method, though we invite everyone to try this out and let us know how it works for them. While PassMark has provided validation for our new testing method, future iterations of MemTest86 are going to treat Apple computers differently.
PassMark has stated that the newer versions of MemTest86 will start blacklisting certain memory addresses from Apple computers to prevent the appearance of these false errors. Apple has been made aware of the issue, but to date Apple has yet to respond to any reports of this issue.
Here at Beetstech, we will continue testing thoroughly every aspect of the Apple computers we receive, including all the memory addresses that we can test.
With macOS Mojave Useful Links.
Memtest86 Pro – errors on parallel, single CPU fine?
Ask Question 0 Alright guys, I’ve been having this problem with my PC lately where it will freeze suddenly, no Blue screen, it just stops. It’s been a nonstop issue, so I decided to do some testing to find out what it could be. First I tested my graphics cards with furmark, but they held up surprisingly well. Then I tried Prime I ran it on “blend” and got a lock up in less than a minute. I tried again under “Large FFT” and got a hang in around 30 minutes or so. Ran the last test with “Small FFT” and it ran for 2 hours with no hang.
VIDEO: memtest86 how many passes
The MemTest86 Flash drive & Pro download includes: Pro edition of MemTest86 pre-installed and ready to use (for the flash drive option); Support for booting on. Feature, MemTest86 v4, MemTest86 v8 Free Edition, MemTest86 v8 Pro Edition, MemTest86 v8 Site Edition. Bootable from USB. Bootable from CD. Bootable. Jun 1, But the web site for Breakin says it does a “full processor and memory test” (my emphasis), while MemTest86 has four CPU modes under which.