Re: Be aware of Testing Memory
- From: "larry moe 'n curly" <larrymoencurly@xxxxxxxxxxx>
- Date: Sun, 1 Jan 2012 00:42:30 -0800 (PST)
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.
.
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