Memtest - Bad RAM got you down?

[OlFactoryHugh]

I just ran into an issue with a stick of ram causing my system to crash, so I thought I'd link the program that helped me identify it.

http://osxdaily.com/2011/05/03/memtest-mac-ram-test/

This guys is free, light, and easy to use. Just follow the instructions for opening terminal to run the command: memtest all 2

 

[marked]

Old post I know but it’s just proved an intermittent fault for me - do you know how to interpret the results? I’ve got 4 sticks of 4gb in my server machine and the output log from memtest but no clear way to work out which is which.

I know the slow way is to remove one at a time and see how we go... but as I have the log...?

It’s my ASU’s P7P55D-E-Pro machine - dimm0 is crucial and dimm1 is Kingston. Crucial stuff is older, (around 8/9 years now), same age as the machine. They would be my guess but it’s a lot of trial and error!

Thanks anyone who can help interpret!

Last login: Tue Mar 12 15:15:50 on console
Unknown-001f29550d15:~ marked1$ memtest all 2

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 10.13.3 (17D47) running in multiuser mode
Memory Page Size: 4096
System has 8 Intel core(s) with SSE
Requested memory: 4033MB (4229042176 bytes)
Available memory: 4033MB (4229042176 bytes)
Allocated memory: 4033MB (4229042176 bytes) at local address 0x00000001078ac000
Attempting memory lock... locked successfully
Partitioning memory into 2 comparison buffers...
Buffer A: 2016MB (2114521088 bytes) starts at local address 0x00000001078ac000
Buffer B: 2016MB (2114521088 bytes) starts at local address 0x000000018593c800

Running 2 test sequences... (CTRL-C to quit)

Test sequence 1 of 2:

Running tests on full 4033MB region...
Stuck Address : testing 1 of 16

FAILURE! Data mismatch at local address 0x000000011ade3200
Actual Data: 0x000000031ade3200

Linear PRN : testing 1 of 16

FAILURE! Data mismatch at local address 0x000000011ade3490
Expected Data: 0xba2815937ed6b895, Actual Data: 0xba2815837ed6b895

Running comparison tests using 2016MB buffers...
Random Value :

FAILURE! Data mismatch at local BUFA address 0x000000010a984b58, BUFB address 0x0000000188a15358
BUFA Data: 0xdf7a71b22bfc5fe2, BUFB Data: 0xdf7a71b02bfc5fe2

Compare XOR :

FAILURE! Data mismatch at local BUFA address 0x000000010a9848f0, BUFB address 0x0000000188a150f0
BUFA Data: 0x21191a23142071c7, BUFB Data: 0x21191a63142071c7

Compare SUB :

FAILURE! Data mismatch at local BUFA address 0x000000010a9848f0, BUFB address 0x0000000188a150f0
BUFA Data: 0x281ab36274409d2e, BUFB Data: 0x281ab3a274409d2e

Compare MUL :

FAILURE! Data mismatch at local BUFA address 0x000000010a9848f0, BUFB address 0x0000000188a150f0
BUFA Data: 0xd244b4a40ca30f82, BUFB Data: 0x4f248e640ca30f82

Compare DIV :

FAILURE! Data mismatch at local BUFA address 0x000000010a9848f0, BUFB address 0x0000000188a150f0
BUFA Data: 0x0000000000000003, BUFB Data: 0x0000004000000001

Compare OR :

FAILURE! Data mismatch at local BUFA address 0x000000010a9848f0, BUFB address 0x0000000188a150f0
BUFA Data: 0xcacdcf7f47fd11ef, BUFB Data: 0xcacdcf7f47fd11ed

Compare AND :

FAILURE! Data mismatch at local BUFA address 0x000000010a9848f0, BUFB address 0x0000000188a150f0
BUFA Data: 0x4a89090947fd0122, BUFB Data: 0x4a89094947fd0120

Sequential Increment:

FAILURE! Data mismatch at local BUFA address 0x000000010a9848f0, BUFB address 0x0000000188a150f0
BUFA Data: 0xeff34da5fb95aac0, BUFB Data: 0xeff34de5fb95aac0

Solid Bits : testing 1 of 64

FAILURE! Data mismatch at local BUFA address 0x000000010a984ac0, BUFB address 0x0000000188a152c0
BUFA Data: 0xffffffffffffffff, BUFB Data: 0xfffffffdffffffff

Block Sequential : testing 1 of 256

FAILURE! Data mismatch at local BUFA address 0x000000010a9848f0, BUFB address 0x0000000188a150f0
BUFA Data: 0x0000000000000000, BUFB Data: 0x0000004000000000

Checkerboard : testing 1 of 64

FAILURE! Data mismatch at local BUFA address 0x000000010a984c48, BUFB address 0x0000000188a15448
BUFA Data: 0xaaaaaaaaaaaaaaaa, BUFB Data: 0xaaaaaaa8aaaaaaaa

Bit Spread : testing 1 of 128

FAILURE! Data mismatch at local BUFA address 0x000000010a984c48, BUFB address 0x0000000188a15448
BUFA Data: 0xfffffffffffffffa, BUFB Data: 0xfffffffdfffffffa

Bit Flip : testing 1 of 512

FAILURE! Data mismatch at local BUFA address 0x000000010a984c70, BUFB address 0x0000000188a15470
BUFA Data: 0xfffffffffffffffe, BUFB Data: 0xfffffffdfffffffe

Walking Ones : testing 1 of 128

FAILURE! Data mismatch at local BUFA address 0x000000010a984948, BUFB address 0x0000000188a15148
BUFA Data: 0xfffffffffffffffe, BUFB Data: 0xffffffbffffffffe

Walking Zeroes : testing 1 of 128

FAILURE! Data mismatch at local BUFA address 0x000000010a9848f0, BUFB address 0x0000000188a150f0
BUFA Data: 0x0000000000000001, BUFB Data: 0x0000004000000001

Test sequence 2 of 2:

Running tests on full 4033MB region...
Stuck Address : testing 1 of 16

FAILURE! Data mismatch at local address 0x000000011ade3200
Actual Data: 0x000000031ade3200

Linear PRN : testing 1 of 16

FAILURE! Data mismatch at local address 0x000000011ade30b8
Expected Data: 0xa51087bd0b18b586, Actual Data: 0xa51087fd0b18b586

Running comparison tests using 2016MB buffers...
Random Value :

FAILURE! Data mismatch at local BUFA address 0x000000010a984848, BUFB address 0x0000000188a15048
BUFA Data: 0xeea70f7bb6a94b12, BUFB Data: 0xeea70f79b6a94b12

Compare XOR :

FAILURE! Data mismatch at local BUFA address 0x000000010a984848, BUFB address 0x0000000188a15048
BUFA Data: 0x5058caf60966ffb2, BUFB Data: 0x5058caf40966ffb2

Compare SUB :

FAILURE! Data mismatch at local BUFA address 0x000000010a984848, BUFB address 0x0000000188a15048
BUFA Data: 0x95691b548a0727cc, BUFB Data: 0x95691b528a0727cc

Compare MUL :

FAILURE! Data mismatch at local BUFA address 0x000000010a984848, BUFB address 0x0000000188a15048
BUFA Data: 0xe58ba33d924cffe4, BUFB Data: 0x370ba877924cffe4

Compare DIV :

FAILURE! Data mismatch at local BUFA address 0x000000010a984848, BUFB address 0x0000000188a15048
BUFA Data: 0x0000000000000001, BUFB Data: 0x0000000000000000

Compare OR :

FAILURE! Data mismatch at local BUFA address 0x000000010a984948, BUFB address 0x0000000188a15148
BUFA Data: 0x6eefa7d0fbffb89f, BUFB Data: 0x6eefa790fbffb89f

Compare AND :

FAILURE! Data mismatch at local BUFA address 0x000000010a984948, BUFB address 0x0000000188a15148
BUFA Data: 0x66c720d0f9ad2814, BUFB Data: 0x66c72090f9ad2814

Sequential Increment:

FAILURE! Data mismatch at local BUFA address 0x000000010a9848f0, BUFB address 0x0000000188a150f0
BUFA Data: 0xbf9e122affd993fa, BUFB Data: 0xbf9e126affd993fa

Solid Bits : testing 1 of 64

FAILURE! Data mismatch at local BUFA address 0x000000010a984c70, BUFB address 0x0000000188a15470
BUFA Data: 0xffffffffffffffff, BUFB Data: 0xfffffffdffffffff

Block Sequential : testing 1 of 256

FAILURE! Data mismatch at local BUFA address 0x000000010a9848f0, BUFB address 0x0000000188a150f0
BUFA Data: 0x0000000000000000, BUFB Data: 0x0000004000000000

Checkerboard : testing 1 of 64

FAILURE! Data mismatch at local BUFA address 0x000000010a984a70, BUFB address 0x0000000188a15270
BUFA Data: 0x5555555555555555, BUFB Data: 0x5555555755555555

Bit Spread : testing 1 of 128

FAILURE! Data mismatch at local BUFA address 0x000000010a984a70, BUFB address 0x0000000188a15270
BUFA Data: 0x0000000000000005, BUFB Data: 0x0000000200000005

Bit Flip : testing 1 of 512

FAILURE! Data mismatch at local BUFA address 0x000000010a984c70, BUFB address 0x0000000188a15470
BUFA Data: 0xfffffffffffffffe, BUFB Data: 0xfffffffdfffffffe

Walking Ones : testing 1 of 128

FAILURE! Data mismatch at local BUFA address 0x000000010a984948, BUFB address 0x0000000188a15148
BUFA Data: 0xfffffffffffffffe, BUFB Data: 0xffffffbffffffffe

Walking Zeroes : testing 1 of 128

FAILURE! Data mismatch at local BUFA address 0x000000010a9848f0, BUFB address 0x0000000188a150f0
BUFA Data: 0x0000000000000001, BUFB Data: 0x0000004000000001

*** Address Test Failed *** One or more DIMM address lines are non-functional.
Execution time: 107 seconds.