Problemi ram

[Andcon74]

Ciao a tutti,
Da qualche periodo ogni tanto ho dei kernel panic con schermata grigia che avvertiva della necessità di riavvio del Mac. In un paio di casi, non riuscendo a riavviare il Mac (continuavano degli riavvii ripetuti) ho risolto reinstallando il macOS da chiavetta. Ho provato l'Apple Hardware Test che però, rispetto ad altre volte non riesce a completare il test e si blocca.
Così ho installato Rember e il risultato è questo che allego:

test ram 4b.pdf

(18.22 KiB) Scaricato 22 volte

Non essendo io molto pratico, sapreste dirmi se è un problema di ram difettosa o qualcos'altro?

grazie, ciao,
Andrea

[faxus]

Pare di si.
Problemi di ram.

Sarà più preciso qualcuno che ne sa di più sull'argomento.

Intanto posto come testo, come andrebbe fatto sempre.
Faciliterà interpretazione e visibilità della tua richiesta di aiuto:

Codice: Seleziona tutto

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 10.12.6 (16G29) running in multiuser mode
Memory Page Size: 4096
System has 4 Intel core(s) with SSE
Requested memory: 11731MB (12301754368 bytes)
Available memory: 11731MB (12301754368 bytes)
Allocated memory: 11731MB (12301754368 bytes) at local address
0x000000010a695000
Attempting memory lock... locked successfully
Partitioning memory into 2 comparison buffers...
Buffer A: 5865MB (6150877184 bytes) starts at local address
0x000000010a695000
Buffer B: 5865MB (6150877184 bytes) starts at local address
0x0000000279084000
Running 3 test sequences... (CTRL-C to quit)
Test sequence 1 of 3:
Running tests on full 11731MB region...
  Stuck Address       :                 setting  1 of 16
ok
  Linear PRN          :    setting  1 of 16                ok
Running comparison tests using 5865MB buffers...
Random Value
Compare XOR
Compare SUB
Compare MUL
Compare DIV
Compare OR
Compare AND
Sequential Increment:
Solid Bits          :
\ ok ok
   ok
   ok
   ok
   ok
   ok
   ok
: : : : : : :
FAILURE! Data mismatch at local BUFA address 0x0000000258108180,
BUFB address 0x00000003c6af7180
BUFA Data: 0x0000004000000000, BUFB Data: 0x0000000000000000
  Block Sequential    :                   setting   1 of 256
FAILURE! Data mismatch at local BUFA address 0x00000001c9834c38,
BUFB address 0x0000000338223c38
BUFA Data: 0x8484848484848484, BUFB Data: 0x8484868484848484
  Checkerboard        :                 setting  1 of 64
FAILURE! Data mismatch at local BUFA address 0x00000001cab45c38,
BUFB address 0x0000000339534c38
BUFA Data: 0x5555555555555555, BUFB Data: 0x5555575555555555
setting  1 of 64  Bit Spread          :                   setting   1 of 128
ok
  Bit Flip            :                   setting   1 of 512
FAILURE! Data mismatch at local BUFA address 0x00000001cab45c38,
BUFB address 0x0000000339534c38
BUFA Data: 0x0000000000000004, BUFB Data: 0x0000020000000004
  Walking Ones        :                   setting   1 of 128
FAILURE! Data mismatch at local BUFA address 0x00000001cab45998,
BUFB address 0x0000000339534998
BUFA Data: 0x000000007fffffff, BUFB Data: 0x000080007fffffff
  Walking Zeroes      :                   setting   1 of 128
FAILURE! Data mismatch at local BUFA address 0x00000001cab45c38,
BUFB address 0x0000000339534c38
BUFA Data: 0x0000000000000001, BUFB Data: 0x0000020000000001
Test sequence 2 of 3:
Running tests on full 11731MB region...
  Stuck Address       :                 setting  1 of 16
ok
  Linear PRN          :    setting  1 of 16
FAILURE! Data mismatch at local address 0x00000002781a6180
Expected Data: 0xb1707bba1bcc3615, Actual Data: 0xb1707bfa1bcc3615
Running comparison tests using 5865MB buffers...
Random Value
Compare XOR
Compare SUB
Compare MUL
Compare DIV
Compare OR
Compare AND
Sequential Increment:
Solid Bits          :
\ ok ok
   ok
   ok
   ok
   ok
   ok
   ok
: : : : : : :
FAILURE! Data mismatch at local BUFA address 0x0000000114533180,
BUFB address 0x0000000282f22180
BUFA Data: 0x0000000000000000, BUFB Data: 0x0000004000000000
  Block Sequential    :                   setting   1 of 256
FAILURE! Data mismatch at local BUFA address 0x00000001cab45c38,
BUFB address 0x0000000339534c38
BUFA Data: 0x8080808080808080, BUFB Data: 0x8080828080808080
  Checkerboard        :                 setting  1 of 64
setting  1 of 64
FAILURE! Data mismatch at local BUFA address 0x0000000258108180,
BUFB address 0x00000003c6af7180
BUFA Data: 0xaaaaaaeaaaaaaaaa, BUFB Data: 0xaaaaaaaaaaaaaaaa
  Bit Spread          :                   setting   1 of 128
FAILURE! Data mismatch at local BUFA address 0x00000001cab45c38,
BUFB address 0x0000000339534c38
BUFA Data: 0x000000005fffffff, BUFB Data: 0x000002005fffffff
  Bit Flip            :                   setting   1 of 512
FAILURE! Data mismatch at local BUFA address 0x00000001cab45c38,
BUFB address 0x0000000339534c38
BUFA Data: 0x0000000000000001, BUFB Data: 0x0000020000000001
  Walking Ones        :                   setting   1 of 128
FAILURE! Data mismatch at local BUFA address 0x00000001cab45998,
BUFB address 0x0000000339534998
BUFA Data: 0x000000007fffffff, BUFB Data: 0x000080007fffffff
  Walking Zeroes      :                   setting   1 of 128
FAILURE! Data mismatch at local BUFA address 0x00000001cab45998,
BUFB address 0x0000000339534998
BUFA Data: 0x0000000000000001, BUFB Data: 0x0000800000000001
Test sequence 3 of 3:
Running tests on full 11731MB region...
  Stuck Address       :                 setting  1 of 16
ok
  Linear PRN          :    setting  1 of 16                ok
Running comparison tests using 5865MB buffers...
Random Value
Compare XOR
Compare SUB
Compare MUL
Compare DIV
Compare OR
Compare AND         :
: \ ok
: ok
: ok
: ok
: ok
: ok
FAILURE! Data mismatch at local BUFA address 0x00000001cab45998,
BUFB address 0x0000000339534998
BUFA Data: 0xd02e4104736d01cd, BUFB Data: 0xd02ec104736d01cd
Sequential Increment:       ok
Solid Bits          :
setting  1 of 64
FAILURE! Data mismatch at local BUFA address 0x00000001cab45c38,
BUFB address 0x0000000339534c38
BUFA Data: 0x0000000000000000, BUFB Data: 0x0000020000000000
  Block Sequential    :                   setting   1 of 256
FAILURE! Data mismatch at local BUFA address 0x00000001ca777c38,
BUFB address 0x0000000339166c38
BUFA Data: 0x8484848484848484, BUFB Data: 0x8484868484848484
  Checkerboard        :                 setting  1 of 64
FAILURE! Data mismatch at local BUFA address 0x0000000258108180,
BUFB address 0x00000003c6af7180
BUFA Data: 0xaaaaaaeaaaaaaaaa, BUFB Data: 0xaaaaaaaaaaaaaaaa
  Bit Spread          :                   setting   1 of 128
ok
  Bit Flip            :                   setting   1 of 512
FAILURE! Data mismatch at local BUFA address 0x00000001cab45c38,
BUFB address 0x0000000339534c38
BUFA Data: 0x0000000000000010, BUFB Data: 0x0000020000000010
  Walking Ones        :                   setting   1 of 128
FAILURE! Data mismatch at local BUFA address 0x00000001cab45998,
BUFB address 0x0000000339534998
BUFA Data: 0x000000007fffffff, BUFB Data: 0x000080007fffffff
  Walking Zeroes      :                   setting   1 of 128
FAILURE! Data mismatch at local BUFA address 0x00000001cab45998,
BUFB address 0x0000000339534998
BUFA Data: 0x0000000000000001, BUFB Data: 0x0000800000000001
*** Memory Test Failed ***  Please check transcript for details.
Execution time: 3251 seconds.

[Andcon74]

Ciao,
Grazie per avere evidenziato il testo: in effetti ci avevo pensato, ma non trovavo il modo di "incasellarlo", e così ho allegato il file.

[Havana92]

Il test della memoria Ram va eseguito senza sistema operativo avviato, altrimenti una parte di Ram viene utilizzata: lo puoi notare in Monitoraggio attività, Memoria, memory used.

Recentemente l'Apple Hardware Test mi dava un errore riguardante i moduli di memoria, allora mi sono interessato al problema; però a volte l'AHT non è preciso al 100%.

Crea una bootable usb drive con MemTest86.
https://www.memtest86.com/download.htm , clicca su "MemTest86 v8.1 Free Edition Download", estrai l'archivio.
Io usai "Etcher" per creare l'usb bootable con il file "memtest86-usb.img".
Spegni il mac con l'usb inserita. Riaccendilo e tieni premuto ALT.
Alla prima schermata, spostati su EFI boot e premi Invio.
Parte un conto alla rovescia. Il test mi durò 4 ore.
La versione Free di MemTest86 utilizza solo una CPU.
Alla fine del test puoi salvare il report in una cartella dell'usb.

Sarebbe meglio eseguire il test con un banco di Ram alla volta.

[Andcon74]

Grazie, provo così. Casomai se mi incarto chiedo aiuto.