How to avoid to use faulty Ram Areas with EfiUnusableMemory

John Galt wrote:

Aikawa24 wrote:

Memtest86+ is the Best app to test Ram and its highly accurate,

It appears you have been misled.

It is not possible to reliably test memory on the system in which the app performing the test is running.

A memory test on the system in which the app is performing the test is running might produce false negatives. False assurances that "everything is OK."

However, if the application has enough control over memory mapping that it can direct all reads/writes to real RAM, and avoid overwriting the RAM out of which it is running, there is no reason to believe that any problems discovered would be false positives.

When the OP says, "maybe this will help many with faulty soldered Ram to use their MacBooks a bit longer," I believe he is making faulty assumptions about what causes most Macs to be retired or scrapped. The usual causes are almost surely things like hard drive or SSD failure, inability to upgrade hardware or software – and user-caused damage (dropping laptops). RAM that is good, later going bad, is probably WAY, WAY down the "cause of death" list.

But I'm not going to make a blanket pronouncement that RAM failures never happen to anyone. Or that a third party RAM testing tool must be wrong just because it finds RAM failures where Apple Diagnostics found none.

I was not completely doubting the memory issue, I was just suggesting caution with trusting a utility that has been dormant for a decade. I do plan to start using Memtest86+ at some point since it is open source and at one time it was the better app until it went dormant, but I would want to compare the results with another utility which has proven itself to me for the last decade.

Looking at the memory addresses, I do see a commonality in the addresses which are listed as failing. I had overlooked it due to the low resolution of the picture as it was hard to read.

FYI, when posting pictures, please make sure the are in the proper orientation. It is frustrating to see pictures sideways or upside down. You should not make the people helping you work so hard to view them. It is easy to rotate the pictures on your iPhone/iPad:

https://www.iphonelife.com/blog/5/tip-day-how-rotate-photo

0nelight wrote:

I run rEFInd Boot Manager to execute a very small EFI-Script which disables the faulty RAM-Area before I boot MacOS (works on Big Sur on MacBook Pro Late 2013).

...

I use this solution for years now, but at this moment I don't remember where the Source Code (with the hardcoded area) is. I will check tomorrow and will update you here as soon as I found it.

I'm glad to hear that it worked out for you.

One question: How have you used this solution "for years now" when your original post (from before when you applied it) isn't even one month old?

How do you know you have faulty RAM?

Stop using a third party app that is obviously reporting incorrect errors.

Garbage app.

Aikawa24 wrote:

Apple diagnostic said all is ok

Since you disagree with it, get it fixed: Official Apple Support

John Galt wrote:

... due to its implementation of ALSR since Lion (at least).

It actually goes way back to Leopard (at least).

Found the sourcecode and uploaded it:

https://github.com/0nelight/macOs-Disable-RAM-Areas

Sorry - my mistake. I assumed the reply was from the original poster.