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My computer hangs at random on multiple occasions and on different OSes today, requiring me to hit the reset button. I suspect it could be a memory problem and did a memtest with memtest86.It went through two passes with no errors. Is that enough, or do I need to run through overnight until I see an error?What if it is a motherboard or CPU issue? How do I know without getting a new motherboard?System Specifications:.
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Memory: 2.0GiB. Processor Pentium(R) Dual-Core CPU E5300 @ 2.60GHz x 2. Motherboard: ASUS P5KPL-AM EPU. Testing can not prove the absence of bugs, only their presenceMemtest is great for finding errors in RAM. The rate at which is find errors is by necessity inversely proportional to how broken the RAM is. The more broken it is the faster it finds errors.90% of the time, if the RAM has a problem, memtest will find it within 10 seconds, 99% of the time, one pass will be enough to find the issue.
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The longer it takes to find the issue, the more subtle it is and the less likely it is the cause a problem with your PC (but you should still get new ram if you get even one error)As the your computer is crashing quite frequently and you have run a few passes, It's probably not your RAM. As a next step, you should test you hard drive and then CPU with a tool such as Ultimate Boot CD or Hiren's. (Most modern BIOS's also have a built in HDD testing feature). At work we usually left the machines running over night, but in all fairness, every time I've been able to show a memory problem with memtest it has been within seconds of starting it.I've never seen a machine do 1 full pass to fail on one the following. (Not that it is necessarily impossible, just to show that it is rare.)I used to work in a computer shop where we started memtest on new machines on a more or less daily basis.Without enough info to really say so I'd still guess your problem is likelier an over heating or bad driver one.Since you've tried more than one OS the driver part seems unlikely. Unless you've for example only tried different windows versions that use the same driver.
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I have seen RAM pass the first 6 passes of memtest and then fail subsequent passes, and when running a Linux OS with that RAM would see locking up after a 6-8 hours. Other RAM on the same motherboard ran fine, so apparently the failing RAM was temperature sensitive.When I suspect a RAM problem (e.g. Dell computers with diagnostic lights) I run memtest on one RAM module at a time in the first slot for 8-16hrs. If it passes that confirms both that slot and RAM module are good and I can (more) confidently use that slot to test other RAM modules. My experience with memtest86+ differs a bit from most people here. Memtest86 has helped me a lot along the years but unfortunately it sometimes fails to detect errors.Although memtest works the majority of the time, it failed me a couple of times. The first time it failed to detect errors i had a PC with 1x 4GB DDR3 that was giving me BSODs related to the memory.
I ran memtest for an entire day, we're talking about 15+ passes but no errors. 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.
MemTest86 tries to do a complete test of the RAM. While doing so, it has also becomea good all-around test, since some of the tests also touch upon the motherboard'smemory controller and the CPU.RAM has much increased, to the point that a portable phone may today containmore RAM than for a mainframe of 20 years ago. The tests have multiplied asMemTest86 has evolved, and so has the RAM.Although the RAM has become faster, the tests are still time-consuming,measured in hours or even days.Now for the bad news: I have found at least two respectable sources,andthat give the same advice. I quote from Ten Forums:MemTest86+ needs to run for at least 8 passes to be anywhere near conclusive, anything less will not give a complete analysis of the RAM.If you are asked to run MemTest86+ by a Ten Forums member make sure you run the full 8 passes for conclusive results. If you run less than 8 passes you will be asked to run it again.I should remark that MemTest86 has two versions, the Free and Pro, where the Proversion has several more tests than the Free version and configuration options.You may see the differences in the article.More information about the optimal number of passes can be gleamed from the articlefrom the description of the MemTest86 config file, mt86.cfg, available only inthe Pro version:PASS1FULLSpecifies whether the first pass shall run the full or reduced test.By default, the first pass shall run a reduced test (ie.
Feweriterations) in order to detect the most obvious errors as soon aspossible.Conclusion 1: The first pass is shorter and faster, intended mostly to detecthard errors. The fact that the first pass has passed without error isencouraging, but users of the Free version need to wait for the second passfor the full gamut of tests.The largest number of passes I have found was in this test:Test 7 Moving inversions, 32 bit patternThis is a variation of the moving inversions algorithm that shifts thedata pattern left one bit for each successive address. The startingbit position is shifted left for each pass. To use all possible datapatterns 32 passes are required. I usually run memtest EVERY TIME I change CPU, memory or notice odd issues. Reason is - memtest does not just test memory.
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It will error out in three other important cases:1) If there are issues due to overheating of either CPU or memory. Normally, memtest loads CPU for several of the tests to almost 100%.2) if CPU cannot access memory correctly.
Most of the tests read & write at all locations of the memory.3) if there are problems with power. A weak power supply or bad capacitors cause too many spikes offsetting random bits.If I see at least a single red error, I start looking for what should be removed / fixed before using the hardware.
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