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Memory Test

E

etsi

macrumors regular
Original poster
Oct 23, 2011
248
1
Hello,

How can I test my memory to check if it's bad?
 
Thanks but can I boot with a usb disk and memtest?
 
Thanks

Installed applejack and run it from recovery console.

Memtest version 4.22 (64-bit)
Copyright (C) 2004 Charles Cazabon
Copyright (C) 2004-2008 Tony Scaminaci (Macintosh port)
Licensed under the GNU General Public License version 2 only

NOTE: No command-line arguments have been specified
Using defaults: Test all available memory, one test pass, no logfile

Mac OS X 10.7.2 (11C74) running in multiuser mode
Memory Page Size: 4096
System has 8 Intel core(s) with SSE
Requested memory: 7228MB (7579443200 bytes)
Available memory: 7228MB (7579443200 bytes)
Allocated memory: 7228MB (7579443200 bytes) at local address 0x0000000101000000
Attempting memory lock... locked successfully
Partitioning memory into 2 comparison buffers...
Buffer A: 3614MB (3789721600 bytes) starts at local address 0x0000000101000000
Buffer B: 3614MB (3789721600 bytes) starts at local address 0x00000001e2e29000

Running 1 test sequence... (CTRL-C to quit)

Test sequence 1 of 1:

Running tests on full 7228MB region...
Stuck Address : ok
Linear PRN : ok
Running comparison tests using 3614MB buffers...
Random Value : ok
Compare XOR : ok
Compare SUB : ok
Compare MUL : ok
Compare DIV : ok
Compare OR : ok
Compare AND : ok
Sequential Increment: ok
Solid Bits : ok
Block Sequential : ok
Checkerboard : ok
Bit Spread : ok
Bit Flip : ok
Walking Ones : ok
Walking Zeroes : ok

All tests passed! Execution time: 4430 seconds.
 
Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

You can run Rember in OSX.
 
shortcut3d said:
Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

You can run Rember in OSX.
Click to expand...

Rember is not using all the memory for testing.

Also it displayed an error I will post it later. But I am wondering if mem86test is ok why Rember displayed an error?
 
Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

etsi said:
shortcut3d said:
Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

You can run Rember in OSX.
Click to expand...

Rember is not using all the memory for testing.

Also it displayed an error I will post it later. But I am wondering if mem86test is ok why Rember displayed an error?
Click to expand...

That is very interesting because Rember is supposedly just a GUI interface for memtest.
 
I think it's an older version of memtest under Rember.

I will post the error later, very strange.
 
Rember:


Memtest version 4.22 (64-bit)
Copyright (C) 2004 Charles Cazabon
Copyright (C) 2004-2008 Tony Scaminaci (Macintosh port)
Licensed under the GNU General Public License version 2 only

Mac OS X Server 10.7.2 (11C74) running in multiuser mode
Memory Page Size: 4096
System has 8 Intel core(s) with SSE
Requested memory: 6214MB (6516879360 bytes)
Available memory: 6214MB (6516879360 bytes)
Allocated memory: 6214MB (6516879360 bytes) at local address 0x0000000101000000
Attempting memory lock... locked successfully
Partitioning memory into 2 comparison buffers...
Buffer A: 3107MB (3258439680 bytes) starts at local address 0x0000000101000000
Buffer B: 3107MB (3258439680 bytes) starts at local address 0x00000001c337d800

Running 1 test sequence... (CTRL-C to quit)

(big output not included)

Running tests on full 6214MB region...
FAILURE! Data mismatch at local BUFA address 0x00000001209fc0c0, BUFB address 0x00000001e2d798c0
BUFA Data: 0xffffffffffbfffdf, BUFB Data: 0xffffffffffbfffff



Memory is Kingston HyperX DDR3 1866MHz CL11

Do you think is bad memory or a problem with 1866Mhz ???

I will test again the default 4GB with Rember
 
Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

When I run Rember on 1866MHz it does not return any errors.
 
Ok thanks I will some more test and I think I will return the memory.
 
^^ Did you end up returning it then? I'm getting similar errors with my 8GB Corsair RAM (Macbook Pro), so I guess it's faulty?
 
etsi said:
Hello,

How can I test my memory to check if it's bad?
Click to expand...

Ok, this how bad off I am. When I read your post, I thought you were referring to a memory test to evaluate memory loss in relation to Alzheimer's or other forms of dementia.

I was reading the thread to see if I could down load a test to use on myself! :eek: :p

It was only when I saw GGJstudio's avatar that I realized my mindless error.

Time to lie down, I think...:eek: :D
 
Yes I have returned it and I am thinking to buy 16 GB @ 1333Mhz instead.

I was getting random errors with any test I run and system crashed several times when I used almost the whole memory.
 
etsi said:
Rember:


Memtest version 4.22 (64-bit)
Copyright (C) 2004 Charles Cazabon
Copyright (C) 2004-2008 Tony Scaminaci (Macintosh port)
Licensed under the GNU General Public License version 2 only

Mac OS X Server 10.7.2 (11C74) running in multiuser mode
Memory Page Size: 4096
System has 8 Intel core(s) with SSE
Requested memory: 6214MB (6516879360 bytes)
Available memory: 6214MB (6516879360 bytes)
Allocated memory: 6214MB (6516879360 bytes) at local address 0x0000000101000000
Attempting memory lock... locked successfully
Partitioning memory into 2 comparison buffers...
Buffer A: 3107MB (3258439680 bytes) starts at local address 0x0000000101000000
Buffer B: 3107MB (3258439680 bytes) starts at local address 0x00000001c337d800

Running 1 test sequence... (CTRL-C to quit)

(big output not included)

Running tests on full 6214MB region...
FAILURE! Data mismatch at local BUFA address 0x00000001209fc0c0, BUFB address 0x00000001e2d798c0
BUFA Data: 0xffffffffffbfffdf, BUFB Data: 0xffffffffffbfffff



Memory is Kingston HyperX DDR3 1866MHz CL11

Do you think is bad memory or a problem with 1866Mhz ???

I will test again the default 4GB with Rember
Click to expand...

it is not the ram I just ran the same ram test on a 2011 mac mini with 2 sticks of 4gb ram got the same results the ram was gskill 1333. something else is up. I think apple's efi firmware may have caused both remember and memtest to run bad. I have a house full of mini's and ram I will do a lot of testing on this.
 
In my case the tests never showed any errors with the default memory that was installed in mac mini.
 
I tested six sets of ram today including the oem samsung. all failed with the exact same error yours did.. I then thought maybe the mini is bad, but when I lifted it up it was really warm. so I download free istat widget and low and behold the fan was at 0. I opened the mini and looked at the fan plus and it was ever so slightly popped up.

I pushed it down and all six sets of ram passed. I figure it was not fully snapped in at the factory the contact was intermittent this was cause of the bad ram tests. Since I mod and sell on ebay 2 to 4 minis a week this is the third one out of 50 plus with the loose fan. The other two the plug was really loose and easy to see. I am glad I test the minis before sending them out.
 
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