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Versão atual de: Motti Shneor ,

Título:

One memory slot causes memory errors on whatever RAM module installed

Texto:

Actually My iMac is  '''Late 2015 27” i5 3.3GHz''' for some reason it wasn’t  in the list.

Close to the  purchase early 2016, I ordered and installed 2 8GB RAM modules from OWC, in addition to the two 8GB modules (from Crucial) that came with the iMac. they all  worked fine until recently.

In the last months I experienced dramatic increase in app crashes, daemon crashes, and strange log lines, until some software developer (Mike Bombich from CCC) whose daemon crashed on me, and I sent logs to - suggested that maybe I had a bad RAM module.

I ran Apple diagnostics - which passed OK. I then downloaded a famous memory testing tool called '''MemTest86 v8.4''' - which boots from a USB, and performs long and thorough memory tests. It ran for about 9 hours - and reported thousands of Memory problems. Of course I was sure there was a bad RAM module.

Since I have lifetime warranty on OWC modules, I pulled out the Apple original modules, and ran the tests again with only OWC modules installed. Tests passed without errors. I then replaced them with the originals - and tested again, this time with only Apple-provided Crucial modules. Again - no errors.

I got puzzled. I cleaned the ram seat, re-seated and  re-ordered the 4 modules and tested again - Errors returned.

I remembered that both OWC and Crucial modules worked fine when installed in slots 1 and 3. So I pulled just one module out of slot 0 - and now ran the tests with 3 modules (24GB) at slots 1,2,3 — Still thousands of errors.  Tested again with slots 0,1,3   — and got no errors.

VERY-LONG story short (each test takes 6-9 hours) - All RAM modules perform perfectly - unless they’re seated in slot 2 - which I suspect is faulty. I reseated the modules so many times now, I’m quite sure there’s no dust or some corrosion there.

My question: What else can be done here? Is anything there “fixable” is it reasonable to give up 8GB and live with just 3 modules? Should I invest in 2 16GB modules instead?

Any advise will be greatly appreciated.

dispositivo:

iMac Intel 27" Retina 5k Display

Status:

open

Resposta Aceita:

+652123

Mensagem original de: Motti Shneor ,

Título:

One memory slot causes memory errors on whatever RAM module installed

Texto:

Actually My iMac is  '''Late 2015 27” i5 3.3GHz''' for some reason it wasn’t  in the list.

Close to the  purchase early 2016, I ordered and installed 2 8GB RAM modules from OWC, in addition to the two 8GB modules (from Crucial) that came with the iMac. they all  worked fine until recently.

In the last months I experienced dramatic increase in app crashes, daemon crashes, and strange log lines, until some software developer (Mike Bombich from CCC) whose daemon crashed on me, and I sent logs to - suggested that maybe I had a bad RAM module.

I ran Apple diagnostics - which passed OK. I then downloaded a famous memory testing tool called '''MemTest86 v8.4''' - which boots from a USB, and performs long and thorough memory tests. It ran for about 9 hours - and reported thousands of Memory problems. Of course I was sure there was a bad RAM module.

Since I have lifetime warranty on OWC modules, I pulled out the Apple original modules, and ran the tests again with only OWC modules installed. Tests passed without errors. I then replaced them with the originals - and tested again, this time with only Apple-provided Crucial modules. Again - no errors.

I got puzzled. I cleaned the ram seat, re-seated and  re-ordered the 4 modules and tested again - Errors returned.

I remembered that both OWC and Crucial modules worked fine when installed in slots 1 and 3. So I pulled just one module out of slot 0 - and now ran the tests with 3 modules (24GB) at slots 1,2,3 — Still thousands of errors.  Tested again with slots 0,1,3   — and got no errors.

VERY-LONG story short (each test takes 6-9 hours) - All RAM modules perform perfectly - unless they’re seated in slot 2 - which I suspect is faulty. I reseated the modules so many times now, I’m quite sure there’s no dust or some corrosion there.

My question: What else can be done here? Is anything there “fixable” is it reasonable to give up 8GB and live with just 3 modules? Should I invest in 2 16GB modules instead?

Any advise will be greatly appreciated.

dispositivo:

iMac Intel 27" Retina 5k Display

Status:

open