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Be aware of Testing Memory
A defected memory paired with working memory installed on mobo does not indicted memory error when it boots up. This tricks the PC guru thinking both memory is working. I've had to argue with a man sold old defected memory when I returned it. He did not understand why the defected memory was booted up fine when it paired with working memory. He even maintained that I've had to install as a pair. I did not know how to show him the memory he sold was defect it. The system normally boots up by ignore the defected memory and read only working memory. He showed me the first boot up screen to prove the memory he sold me was working and did not read the total memory size in BIOS program. |
#2
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Be aware of Testing Memory
ask him to use memtest86
"Red Cloud" wrote in message ... A defected memory paired with working memory installed on mobo does not indicted memory error when it boots up. This tricks the PC guru thinking both memory is working. I've had to argue with a man sold old defected memory when I returned it. He did not understand why the defected memory was booted up fine when it paired with working memory. He even maintained that I've had to install as a pair. I did not know how to show him the memory he sold was defect it. The system normally boots up by ignore the defected memory and read only working memory. He showed me the first boot up screen to prove the memory he sold me was working and did not read the total memory size in BIOS program. |
#3
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Be aware of Testing Memory
Red Cloud wrote: A defected memory paired with working memory installed on mobo does not indicted memory error when it boots up. This tricks the PC guru thinking both memory is working. I've had to argue with a man sold old defected memory when I returned it. He did not understand why the defected memory was booted up fine when it paired with working memory. He even maintained that I've had to install as a pair. I did not know how to show him the memory he sold was defect it. The system normally boots up by ignore the defected memory and read only working memory. He showed me the first boot up screen to prove the memory he sold me was working and did not read the total memory size in BIOS program. He's not a guru but an idiot or a liar because he should know that the boot-up memory test is not very thorough at all, and most computers are configured so they perform only an incomplete version of it that mostly just counts the amount of memory installed in the system. To really test memory fairly well you need to run at least one of these diagnostics, each for several hours, and preferrably test with more than one kind of computer (one with an AMD CPU, another with an Intel CPU): MemTest86 www.MemTest86.com MemTest86+ www.MemTest.org Gold Memory www.GoldMemory.cz The first two programs are very similar but have given me different results. I've seen diagnostics run for 4-5 hours before they reported errors, and one diagnostic didn't find the same error again for almost 10 hours. Most memory modules are made with substandard chips that failed some testing done by the $1,000,000 (US) testing machine used by actual chip manufacturers. Those chips are not marked with that manufacturer's part numbers or logo or may be covered with useless and purely decorative heatsinks. Most memory module makers perform their own, much more lax tests on those chips, often using nothing but motherboards. To always avoid getting bad memory, buy modules made only with chips marked as having come from Samsung (SEC), ProMOS, PowerChip, Nanya, Inotera, Elpida, Micron, or Nynix. As far as I know, the only ways to be guaranteed of this is by either looking at the chips on the modules, or by purchasing Samsung or no-heatsink Micron/Crucial modules. |
#4
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Be aware of Testing Memory
On Jan 1, 12:42*am, "larry moe 'n curly"
wrote: Red Cloud wrote: A defected memory paired with working memory installed on mobo does not indicted memory error when it boots up. *This tricks the PC guru *thinking both memory is working. * I've had to argue *with a *man sold old defected memory when I returned it. He did not understand *why the defected *memory was booted up fine when it paired with working memory. He even maintained *that I've *had to install as a pair. * I did not know how to show him the memory he sold *was defect it. *The system normally boots up by ignore the defected memory and read only working memory. * *He showed me the first boot up screen to prove the memory he sold me was working and did not read the total memory size in BIOS program. He's not a guru but an idiot or a liar because he should know that the boot-up memory test is not very thorough at all, and most computers are configured so they perform only an incomplete version of it that mostly just counts the amount of memory installed in the system. To really test memory fairly well you need to run at least one of these diagnostics, each for several hours, and preferrably test with more than one kind of computer (one with an AMD CPU, another with an Intel CPU): * * *MemTest86 * * * * *www.MemTest86.com * * *MemTest86+ * * * *www.MemTest.org * * *Gold Memory * * * *www.GoldMemory.cz The first two programs are very similar but have given me different results. *I've seen diagnostics run for 4-5 hours before they reported errors, and one diagnostic didn't find the same error again for almost 10 hours. Most memory modules are made with substandard chips that failed some testing done by the $1,000,000 (US) testing machine used by actual chip manufacturers. *Those chips are not marked with that manufacturer's part numbers or logo or may be covered with useless and purely decorative heatsinks. *Most memory module makers perform their own, much more lax tests on those chips, often using nothing but motherboards. *To always avoid getting bad memory, buy modules made only with chips marked as having come from Samsung (SEC), ProMOS, PowerChip, Nanya, Inotera, Elpida, Micron, or Nynix. *As far as I know, the only ways to be guaranteed of this is by either looking at the chips on the modules, or by purchasing Samsung or no-heatsink Micron/Crucial modules. Never use memtest86 and no need to use it. Setup program in BIOS displays size of the working memory. |
#5
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Be aware of Testing Memory
Red Cloud wrote:
On Jan 1, 12:42 am, "larry moe 'n curly" wrote: Red Cloud wrote: A defected memory paired with working memory installed on mobo does not indicted memory error when it boots up. This tricks the PC guru thinking both memory is working. I've had to argue with a man sold old defected memory when I returned it. He did not understand why the defected memory was booted up fine when it paired with working memory. He even maintained that I've had to install as a pair. I did not know how to show him the memory he sold was defect it. The system normally boots up by ignore the defected memory and read only working memory. He showed me the first boot up screen to prove the memory he sold me was working and did not read the total memory size in BIOS program. He's not a guru but an idiot or a liar because he should know that the boot-up memory test is not very thorough at all, and most computers are configured so they perform only an incomplete version of it that mostly just counts the amount of memory installed in the system. To really test memory fairly well you need to run at least one of these diagnostics, each for several hours, and preferrably test with more than one kind of computer (one with an AMD CPU, another with an Intel CPU): MemTest86 www.MemTest86.com MemTest86+ www.MemTest.org Gold Memory www.GoldMemory.cz The first two programs are very similar but have given me different results. I've seen diagnostics run for 4-5 hours before they reported errors, and one diagnostic didn't find the same error again for almost 10 hours. Most memory modules are made with substandard chips that failed some testing done by the $1,000,000 (US) testing machine used by actual chip manufacturers. Those chips are not marked with that manufacturer's part numbers or logo or may be covered with useless and purely decorative heatsinks. Most memory module makers perform their own, much more lax tests on those chips, often using nothing but motherboards. To always avoid getting bad memory, buy modules made only with chips marked as having come from Samsung (SEC), ProMOS, PowerChip, Nanya, Inotera, Elpida, Micron, or Nynix. As far as I know, the only ways to be guaranteed of this is by either looking at the chips on the modules, or by purchasing Samsung or no-heatsink Micron/Crucial modules. Never use memtest86 and no need to use it. Setup program in BIOS displays size of the working memory. The BIOS memory test doesn't work right. I had an Nforce2 chipset motherboard, with dual channel memory, and the BIOS memory test could not detect an entire dead chip! That's how bad the BIOS test is. It's not guaranteed to catch anything. Memtest86+ boots from a floppy, CD, or USB stick. If tests everything except BIOS reserved areas (perhaps 1MB worth). As such, it covers about as much as you can reasonably expect to cover. Memory test programs which run while the OS is running, are limited in test coverage, to the free RAM area. Paul |
#6
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Be aware of Testing Memory
In message
someone claiming to be Red Cloud typed: Never use memtest86 and no need to use it. Setup program in BIOS displays size of the working memory. Displaying the size of the memory available to the BIOS and testing to see if it works are very different things. -- It's always darkest before dawn. So if you're going to steal your neighbor's newspaper, that's the time to do it. |
#7
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Be aware of Testing Memory
On Jan 1, 11:38*pm, Paul wrote:
The BIOS memory test doesn't work right. I had an Nforce2 chipset motherboard, with dual channel memory, and the BIOS memory test could not detect an entire dead chip! That's how bad the BIOS test is. It's not guaranteed to catch anything. Memtest86+ boots from a floppy, CD, or USB stick. If tests everything except BIOS reserved areas (perhaps 1MB worth). As such, it covers about as much as you can reasonably expect to cover. Memory test programs which run while the OS is running, are limited in test coverage, to the free RAM area. * * Paul Yes, I recently installed Ubuntu Linux on a machine that I'm sure I have tested thoroughly in the past and thought was fine. Memtest86+ was included in the Ubuntu GRUB menu and it found an error that occurs only at two particular pseudo random values. |
#8
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Be aware of Testing Memory
On Jan 2, 4:39 am, DevilsPGD
wrote: Displaying the size of the memory available to the BIOS and testing to see if it works are very different things. I get it, now. If the bad memory shows tested properly, then buy a new BIOS chip and replace it! |
#9
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Be aware of Testing Memory
In message
someone claiming to be Flasherly typed: On Jan 2, 4:39 am, DevilsPGD wrote: Displaying the size of the memory available to the BIOS and testing to see if it works are very different things. I get it, now. If the bad memory shows tested properly, then buy a new BIOS chip and replace it! Exactly! -- It's always darkest before dawn. So if you're going to steal your neighbor's newspaper, that's the time to do it. |
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