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[TPU] TechPowerUp Announces MemTest64 - Test Memory from Within Windows - Page 2

post #11 of 31
Quote:
Originally Posted by Bartouille View Post

Isn't the whole point of testing ram to do it outside the OS so you don't end up corrupting anything?

I am assuming this works as other stability programs that fill in the RAM to an extent that the OS will also run successfully. I agree that a pure RAM test should be done outside of the OS. I am also wondering now why the windows memory tool takes you out of windows if running this under an OS is very reliable. *hmmm
 
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post #12 of 31
Quote:
Originally Posted by Wishmaker View Post

I am assuming this works as other stability programs that fill in the RAM to an extent that the OS will also run successfully. I agree that a pure RAM test should be done outside of the OS. I am also wondering now why the windows memory tool takes you out of windows if running this under an OS is very reliable. *hmmm

Probably because it can test more ram. I wonder if this is any better than prime 95 at testing memory sub system stability.
post #13 of 31
Quote:
Originally Posted by looniam View Post

i'm not getting to set the ram amount unless i run as admin. eh-smiley.gif

and even then . .:

Use the "maximum" option.

It will try to send other apps to the pagefile, but it can't move the kernel, which is about 1 GB in size.
post #14 of 31
Nice find. Most of the in windows tools are very outdated thumb.gif. Still want to have a bootable memtest for real error checking
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post #15 of 31
Quote:
Originally Posted by Bartouille View Post

Isn't the whole point of testing ram to do it outside the OS so you don't end up corrupting anything?

I certainly recommend using a bootable test to weed out flaky setting or outright defective memory, but you'll need to run more demanding tests to have good confidence in an OC's stability.
Quote:
Originally Posted by Wishmaker View Post

I am assuming this works as other stability programs that fill in the RAM to an extent that the OS will also run successfully. I agree that a pure RAM test should be done outside of the OS. I am also wondering now why the windows memory tool takes you out of windows if running this under an OS is very reliable. *hmmm

Windows Memory Diagnostic seems to be single threaded and is thus borderline useless. You can pass days of it with settings flaky enough to crash moderately stressful real apps in minutes.
Quote:
Originally Posted by rancor View Post

Probably because it can test more ram. I wonder if this is any better than prime 95 at testing memory sub system stability.

Stressapptest generally finds RAM related issues faster.
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post #16 of 31
This is some weird timing. I just ran the latest memtest86 for nine hours without errors, maybe I will do a follow up with this test tonight.

Memtest86 has been consistently updated btw, the latest release is from the end of February and it loads all CPU cores now.
post #17 of 31
Quote:
Originally Posted by Bartouille View Post

Isn't the whole point of testing ram to do it outside the OS so you don't end up corrupting anything?

Yeah I'm confused how this would work. A user-mode process does not have direct access to RAM, only to virtual/paged RAM as controlled and doled out by the OS. So you could never test 100% of your RAM with it because there are regions the OS will not give you access to as a user-mode process. I expect it lets you test most of your RAM though.
post #18 of 31
Quote:
Originally Posted by mott555 View Post

Yeah I'm confused how this would work. A user-mode process does not have direct access to RAM, only to virtual/paged RAM as controlled and doled out by the OS. So you could never test 100% of your RAM with it because there are regions the OS will not give you access to as a user-mode process. I expect it lets you test most of your RAM though.

So memtest86 is still the better option when testing for defective memory?
post #19 of 31
Quote:
Originally Posted by Derp View Post

Memtest86 has been consistently updated btw, the latest release is from the end of February and it loads all CPU cores now.

Yeah, Memtest86 has been multi-threaded for a while and is the first test I run.
Quote:
Originally Posted by lombardsoup View Post

So memtest86 is still the better option when testing for defective memory?

It tests more memory than most anything that needs an OS to run, but doesn't test as hard as some.

A very strenuous test that only tests most memory will find more intermittent errors faster than a less stressful test that tests more memory, but no test can test memory addresses that aren't made available for testing.

I had a defective stick of Crucial Ballistix DDR4 2400 (which Crucial replaced promptly and without fuss, to their credit) recently that would pass atleast five complete passes of Memtest86 7.30, but would fail in less than three minutes of stressapptest. Testing with just test #7 in Memtest86 would also prompt a failure after just a few loops.

Since this failure was intermittent, highly temperature dependent, and on the same address each time, I strongly suspect that there were a few weak cells that made it through basic QA, but which would fail to hold their charge at standard tREF and tREFI settings under more demanding circumstances. The full run of Memtest86 tests wasn't getting the memory warm enough to reliably find this error (test 7 is one of the higher load tests, but ).

If the weak cells had been in an area that stressapptest (run from a bootable Lubuntu USB stick) couldn't test frequently enough (because the OS was using them), then stressapptest may not have found it. If it was a more subtle error, memtest86 may not have found it.

All of the above is why I use multiple tests (Memtest86 first, stressapptest second, and various tests in Windows last) and try to test in worst case scenarios (if the hottest the inside of my case will get in normal use is 30C, I turn fans off until I can get the inside to 40C during memory testing).
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post #20 of 31
Quote:
Originally Posted by Blameless View Post

It tests more memory than most anything that needs an OS to run, but doesn't test as hard as some.

A very strenuous test that only tests most memory will find more intermittent errors faster than a less stressful test that tests more memory, but no test can test memory addresses that aren't made available for testing.

I had a defective stick of Crucial Ballistix DDR4 2400 (which Crucial replaced promptly and without fuss, to their credit) recently that would pass atleast five complete passes of Memtest86 7.30, but would fail in less than three minutes of stressapptest. Testing with just test #7 in Memtest86 would also prompt a failure after just a few loops.

Since this failure was intermittent, highly temperature dependent, and on the same address each time, I strongly suspect that there were a few weak cells that made it through basic QA, but which would fail to hold their charge at standard tREF and tREFI settings under more demanding circumstances. The full run of Memtest86 tests wasn't getting the memory warm enough to reliably find this error (test 7 is one of the higher load tests, but ).

If the weak cells had been in an area that stressapptest (run from a bootable Lubuntu USB stick) couldn't test frequently enough (because the OS was using them), then stressapptest may not have found it. If it was a more subtle error, memtest86 may not have found it.

All of the above is why I use multiple tests (Memtest86 first, stressapptest second, and various tests in Windows last) and try to test in worst case scenarios (if the hottest the inside of my case will get in normal use is 30C, I turn fans off until I can get the inside to 40C during memory testing).

Interesting. I think I'll starting using this with my other tests based on your findings. One last thing. Others have suggested running tests like this inside the OS can corrupt the OS partition: should I be worried about this at all, and are there any precautions I can take?
Edited by lombardsoup - 4/20/17 at 9:20pm
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