Windows Question will the hi pro be enough for the k Latest: Phaaze88 27 minutes ago. Moderators online. Tom's Hardware is part of Future plc, an international media group and leading digital publisher.
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So it doesn't hurt to repeat the tests sometimes. Too many random errors is likely a hardware fault, or a consistent error at the same address or same bits is likely a hardware fault. The more RAM you have the longer the test will take. There should be no concern that you are going to wear out your DRAM after 1 or 2 days of testing. DRAM doesn't wear out to any significant degree unlike Flash memory. The changes of finding an error in the first couple of hours of testing are much higher than finding an error 12 or 24 hours into a test.
If you are pressed for time, do a single pass of the test. If you have more time, do 2 to 4 passes. I should remark that MemTest86 has two versions, the Free and Pro, where the Pro version has several more tests than the Free version and configuration options. You may see the differences in the article Feature Comparision. More information about the optimal number of passes can be gleamed from the article MemTest86 Technical Information from the description of the MemTest86 config file, mt Specifies whether the first pass shall run the full or reduced test.
By default, the first pass shall run a reduced test ie. Conclusion 1 : The first pass is shorter and faster, intended mostly to detect hard errors. The fact that the first pass has passed without error is encouraging, but users of the Free version need to wait for the second pass for the full gamut of tests. This is a variation of the moving inversions algorithm that shifts the data pattern left one bit for each successive address. The starting bit position is shifted left for each pass.
To use all possible data patterns 32 passes are required. This test is quite effective at detecting data sensitive errors but the execution time is long.
Conclusion 2 : Test 7 needs 32 passes to be totally complete, which I take as the upper bound on the number of passes required for a really exhaustive test. I also remark that many of the tests use a random pattern, with a different pattern for each pass, meaning that each pass is different. Taking it to absurd heights, we might conclude that there is no upper limit to the number of passes required for an absolutely conclusive result.
My opinion as regarding the number of passes is that one should run as many passes as one has the time to wait. The lower bound seems to be two passes, as only the second one will be a full test. But the question of "how much is enough" has no real answer. I note again that for the two technical references that I cited above, the minimal number of passes required for a good and conclusive result is 8 passes perhaps so that Test 7 will do one whole 8-bit byte, among other reasons.
On the other hand, errors found by MemTest86 should be taken very seriously. As the question was raised here about the acceptable amount of failures, my answer is that even one failure is too much and not acceptable. In general it is better to run multiple passes. Here are three typical lengths of testing you might use:. When I suspect a RAM problem e. Dell computers with diagnostic lights I run memtest on one RAM module at a time in the first slot for hrs.
Although memtest works the majority of the time, it failed me a couple of times. I then tested it on a completely different computer, same thing, no errors. Operating system was completely unstable but no errors on memtest. I then used a different software named "PC-Check" from Eurosoft which is very similar to memtest but uses different algorithms. It is also bootable, does not need any operating system.
It detected errors in less than 5 minutes. I then was able to send the module to Corsair RMA and get a replacement. So, memtest is very good but not always enough. I currently use memtest and PC-check to check memory. If memtest fails to detect errors, PC check certainly will and vice versa. And trust me, it happens more often than one would think.
I'd say 3 passes is generally enough. If you want to be extra sure, do 8 or 9 passes, since Jeff saw errors in one case only on his 7th or later pass , but that can take forever! As a general rule of thumb, I think LAwLz got it correct here when she said emphasis added :. In most cases memtest will start spitting out errors within a minute if the RAM stick is bad. The more broken it is the faster it finds errors. Last Updated: 7 days ago — Co-authors : 4 — Users : 8.
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May 15, Read the full answer The original is simply known as MemTest
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