MemTest: RAM reliability tester for Windows. MemTest is a RAM tester that runs under Windows. It verifies that your computer can reliably store and retrieve data from memory. A correctly functioning computer should be able to do this with 100% accuracy day in and day out. A computer that fails these tests, perhaps because of old hardware. As MemTest86 V9 supports only the newer UEFI platform, older PCs without UEFI support would be unable to boot MemTest86. In order to run MemTest86, PCs with legacy BIOS platform must use the older V4 release of MemTest86. The download links for the V4 downloads are still provided for those that prefer to work with the V4 bootable images. Memtest Mac free download - WinZip Mac, Technitium MAC Address Changer, Mac Video Downloader, and many more programs.

In this case memory is memory. I think I would test the memory in the Mac and in a non-Mac to be thorough.

If you suspect the memory to have a defect and have a non-Mac system that you can install the memory into you could test on that with https://www.memtest86.com/download.htm.

Memtest Mac free download - WinZip Mac, Technitium MAC Address Changer, Mac Video Downloader, and many more programs. To test your Mac's memory, you can use a number of tools, like the Terminal-based Memtest suite, or the OS X GUI wrapper for it called Rember. And the tests will download from Apple's servers.

Creating a MemTest86 boot disk in Windows Download the Windows MemTest86 USB image. Right click on the downloaded file and select the 'Extract to Here' option. This places the USB image and imaging tool into the current folder. Creating a MemTest86 bootable USB Flash drive in Linux/Mac Download the MemTest86 USB image. Extract the files from the package (unzip memtest86-usb.zip). An image file (.img) and a README file will be created in the current directory. Follow instructions in the README to write the USB flash disk. The tool works on Linux, Windows, and Mac, so you can test the RAM of pretty much any computer you have.For the purposes of this guide, I will be using Mac. The Linux process is very similar, but for that and Windows, I advise you check the MemTest86 documentation that comes with the software download. Memtest86+ on Intel Mac. As the name suggests, Memtest86+ is a very thorough memory testing program for x86 computers. With slight modification of a patch for the Grub bootloader, it will run on Intel Macs. Here is a patch against memtest86+ 1.70, or a prebuilt.iso image. I've be interested to hear how it works on other Macs, especially those.

I believe the bootable USB can be used on the mac doing an ALT boot. If you suspect the system itself, that would help there.

But just like with non-Macs there have been some compatibility issues as well. Not all memory, even though it might have the same specs, will work. OWC's site might help you with the specs. Or https://www.chriswrites.com/where-to-buy-the-best-ram-for-the-mac/, or just google 'best memory for Mac'.

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What's New in MemTest86 for the UEFI platform (Version 5 and later)?

MemTest86 supports booting from the newer UEFI platform. When booting from UEFI, MemTest86 has access to additional services not available in BIOS including:

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• Native 64-bit support
• No longer requires the use of the PAE workaround to access more than 4GB of memory. (PAE = Physical Address Extension)
• Mouse support, where supported by the underlying UEFI system. On older systems a keyboard is still required.
• Improved USB keyboard support. The keyboard now works on systems that fail to emulate IO Port 64/60 correctly. So Mac USB keyboards are now supported.
• Improved multi-threading support, where supported by the underlying UEFI system.
• Reporting of detailed RAM SPD information. Timings, clock speeds, vendor names and much more.
• Support to writing to the USB drive that MemTest86 is running from for logging and report generation. In all prior MemTest86 releases, there was no disk support.
• Use of GPT. (GUID Partition Table)
• ECC RAM support (limited hardware support, ongoing development)
  • Detection of ECC support in both the RAM and memory controller
  • Polling for ECC errors
  • Injection of ECC errors for test purposes. (limited hardware only)
• Support for DDR4 RAM (and associated hardware), including retrieval and reporting of DDR4-specific SPD details. This includes DDR4 RAM that support Intel XMP 2.0 DDR4 RAM timings
• Option to disable CPU caching for all tests
• Having a configuration file to allow settings to be pre-defined without the need for keyboard input. This can help with automation.
• Support for Secure Boot.
• Speed improvements of between 10% and 30%+. Especially for tests, #5, #8 & #9. This is the result more moving to native 64bit code, removing the PAE paging hack, switching compilers and using faster random number generation algorithms.
• Addition of 2 new memory tests to take advantage of 64bit data and SIMD instructions.
• Support for network PXE boot for scalable, diskless deployment to multiple targets
• See the What's New page for a complete list of changes.

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See the feature comparison page for a summary of the differences between the various editions of MemTest86.

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MemTest86 can boot from a USB flash drive or, with Linux systems, by the boot loader (for example, LILO or Grub). Any Windows, Linux or Mac system may be used to create the USB flash drive. Once a MemTest86 boot disk has been created, it may be used on any x86 (PC/Mac) computer.

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MemTest86 (Site Edition) can also boot via network (PXE) boot for scalable provisioning of MemTest86 to multiple client machines in the LAN network. In this configuration, no disks are required; only a PXE Server and PXE boot enabled clients are required to support network boot.