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MB: Asus X99 A-II
RAM: G.Skill Ripjaws V F4-3200C16D-32GVK (3200MHz, 4x 16GB DIMMs, so Total 64GB) in quad-channel configuration.
CPU: i7 6800k @4.0Ghz
GPUs: GTX 1080 Ti and GTX 1060 3GB

(each one a monitor, because I can't get DVI to run parallel with DP on the 1080Ti, and my second monitor only has DVI/VGA)

OS: High Sierra 10.13.2 (17C88) / Clover revision: 4392

 

Hello everybody,
I occasionally have system crashes and suspect that it is related to RAM. However, this RAM is completely new, and a run with MemTest86+ from the USB stick showed no errors. However, if I use Memtest on MacOS, I get a bunch of error messages, but sometimes none (I restart the computer between tests).  
As I just discovered, my RAM is not on the recommended vendor list of my motherboard, nor is it on the manufacturer side of the RAM. I have read several times that the RAM may not have been tested by the manufacturer on this platform. Not a single X99 motherboard is listed for this RAM.
So I also suspect that my RAM is not compatible.
But if that were the case, how could it sometimes work completely error-free?

 

During RAM tests in summer 2017 (a slightly different setup, 4x8GB but still G.Skill Ripjaws V) I had no errors at Memtest under MacOS, if I remember correctly. At that time it ran under Sierra 10.12.6. AptioMemoryFix.efi could also cause problems.

I am appreciative for any help!

 

Here is an excerpt from a faulty test.

It is noticeable that it is always the same address during the test, but a different one after each test.

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 10.13.2 (17C88) running in multiuser mode
Memory Page Size: 4096
System has 12 Intel core(s) with SSE
Requested memory: 57232MB (60012990464 bytes)
Available memory: 57232MB (60012990464 bytes)
Allocated memory: 57232MB (60012990464 bytes) at local address 0x00000001033e1000
Attempting memory lock... locked successfully
Partitioning memory into 2 comparison buffers...
Buffer A: 28616MB (30006495232 bytes) starts at local address 0x00000001033e1000
Buffer B: 28616MB (30006495232 bytes) starts at local address 0x00000007ffc4d800

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

Test sequence 1 of 1:

Running tests on full 57232MB region...
  Stuck Address       : ok              
  Linear PRN          : testing  7 of 16

FAILURE! Data mismatch at local address 0x0000000e88133d30
Expected Data: 0xc4c340079ac9a645, Actual Data: 0xc4c3400788468846

Running comparison tests using 28616MB 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    : testing  80 of 256

FAILURE! Data mismatch at local BUFA address 0x000000078b8c7530, BUFB address 0x0000000e88133d30
BUFA Data: 0x4f4f4f4f4f4f4f4f, BUFB Data: 0x4f4f4f4f88468846

  Checkerboard        : testing  3 of 64

FAILURE! Data mismatch at local BUFA address 0x000000078b8c7530, BUFB address 0x0000000e88133d30
BUFA Data: 0x5555555555555555, BUFB Data: 0x5555555588468846

  Bit Spread          : testing   1 of 128

FAILURE! Data mismatch at local BUFA address 0x000000078b8c7530, BUFB address 0x0000000e88133d30
BUFA Data: 0x0000000000000005, BUFB Data: 0x0000000088468846

  Bit Flip            : testing  74 of 512

FAILURE! Data mismatch at local BUFA address 0x000000078b8c7530, BUFB address 0x0000000e88133d30
BUFA Data: 0x0000000000000200, BUFB Data: 0x0000000088468846

  Walking Ones        : testing  40 of 128

Clover Files attached

config.plist

drivers64UEFI.zip

kexts.zip

ACPI.zip

Edited by TimNeumann

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Okay, after several tests with Memtest86 and stress tests on MacOs,
I come to the result that the errors do not occur because of the built-in RAM.
Most likely it's AptioMemoryFix.efi, so I'll try different versions in the next few days if nobody has a better idea.

 

Does anyone have an overview of all AptioMemoryFix versions?

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Hi, TimNeumann

 

I'm having exactly the same problem! When doing Memtest86 on boot from USB everything ok, but in macOS, when doing Rember test I get errors. And of course I can feel it in general system stability. So question - did you find out what settings in clover/opencore helped you overcome this problem? Thanx! 

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