I have a brand new MacBook Pro Retina (8GB, 256GB SSD), which has experienced some issues for past few weeks.
I decided to run memtest after a complete OS X reinstall.
Here's the log :
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 10.9.4 (13E28) running in multiuser mode Memory Page Size: 4096 System has 4 Intel core(s) with SSE Requested memory: 5943MB (6232047616 bytes) Available memory: 5943MB (6232047616 bytes) Allocated memory: 5943MB (6232047616 bytes) at local address 0x0000000101000000 Attempting memory lock... locked successfully Partitioning memory into 2 comparison buffers... Buffer A: 2971MB (3116023808 bytes) starts at local address 0x0000000101000000 Buffer B: 2971MB (3116023808 bytes) starts at local address 0x00000001babac000 Running 1 test sequence... (CTRL-C to quit) Test sequence 1 of 1: Running tests on full 5943MB region... Stuck Address : ok Linear PRN : ok Running comparison tests using 2971MB 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 : testing 19 of 64 FAILURE! Data mismatch at local BUFA address 0x00000001a144b978, BUFB address 0x000000025aff7978 BUFA Data: 0xaaaaaaaaaaaaaaae, BUFB Data: 0xaaaaaaaaaaaaaaaa Bit Spread : testing 1 of 128 FAILURE! Data mismatch at local BUFA address 0x00000001a42e09f8, BUFB address 0x000000025de8c9f8 BUFA Data: 0xfffffffffffffffe, BUFB Data: 0xfffffffffffffffa Bit Flip : testing 3 of 512 FAILURE! Data mismatch at local BUFA address 0x00000001a0d4f978, BUFB address 0x000000025a8fb978 BUFA Data: 0x0000000000000005, BUFB Data: 0x0000000000000001 Walking Ones : testing 3 of 128 FAILURE! Data mismatch at local BUFA address 0x00000001a18c1978, BUFB address 0x000000025b46d978 BUFA Data: 0xffffffffffffffff, BUFB Data: 0xfffffffffffffffb Walking Zeroes : testing 4 of 128 FAILURE! Data mismatch at local BUFA address 0x00000001a21bd978, BUFB address 0x000000025bd69978 BUFA Data: 0x000000000000000c, BUFB Data: 0x0000000000000008 *** Memory Test Failed *** Please check transcript for details. Execution time: 512 seconds.
The guys at the Apple Store are sure there is no problem with the RAM.
So why Memtest is failing ? Is it normal ?