Overview

MemTest86 is a USB-bootable utility that checks RAM for faults before an operating system loads. It is a strong fit for PC builders, repair shops, overclockers, and manufacturers who need to diagnose memory-related instability. Its focused testing and reporting are useful, but version 11.7’s UEFI and processor requirements rule out Apple Silicon Macs.

Key features

MemTest86 runs memory test patterns through 14 algorithms, including SIMD, Row Hammer, and DMA tests. Its support for DDR2, DDR3, LPDDR4, LPDDR5(x), ECC, CDIMM, and CAMM2 makes it relevant to a wide range of memory diagnosis. This is a specialized RAM tester, however, not a general-purpose hardware diagnostic suite.

Customizable HTML reports preserve findings, while error-address decoding can identify a failed DIMM or chip on supported configurations. That can help turn an error into a more actionable repair lead, though component identification is configuration-dependent. The binaries support Secure Boot and carry Microsoft signatures to verify code integrity.

The program runs independently of an operating system. A Windows, Linux, or Intel-based Mac computer can be used to create its bootable USB drive, but the target machine must have UEFI firmware and x86 or ARM64 hardware. The maker explicitly excludes Apple Silicon M-series Macs.

Free Edition supports up to 16 CPU cores. Pro raises that ceiling to 512 and adds full test automation and custom tests configured through a file. Site Edition adds PXE-based LAN deployment for scalable use and PassMark Management Console integration and reporting. These paid features matter most to organizations managing repeated or distributed diagnostics, not occasional one-machine checks.

Pricing

The freemium structure makes it possible to start with core testing at no cost, while paid licenses add capacity, automation, and deployment. Free Edition costs 0.00 USD per free, with no usage restrictions, but its 16-core limit and forum-only support make it less suitable for high-core-count or support-dependent work.

Plan	Price	What it includes and who it suits
Free Edition	0.00 USD per free	Up to 16 CPU cores; public forum support. A sensible starting point for individual diagnosis and basic testing.
Pro Download	116.00 USD per once	Up to 512 cores, automation, and custom tests; one license per machine running Pro at the same time. Includes 12 months of free upgrades and phone, email, and forum support.
Pro USB Flash Drive	144.00 USD per once	Pro on a USB flash drive, plus shipping; one license per machine running Pro at the same time. Includes 12 months of free upgrades and phone, email, and forum support.
Site Edition	5557.00 USD per once	PXE LAN deployment and Management Console integration and reporting; unlimited users within one organization in one country. Includes 12 months of free upgrades and phone, email, and forum support.

There is no free trial. The one-time Pro prices cover one machine running Pro at a time, while Site’s unlimited-user allowance is bounded to one organization in one country. Paid plans include 12 months of free upgrades; Free Edition does not include the paid support channels.

Platforms

MemTest86 is categorized for Linux, macOS, self-hosted, and Windows, but it runs as a standalone bootable program rather than as an operating-system application. Version 11.7 requires UEFI and x86 or ARM64 hardware; Apple Silicon M-series Macs are unsupported. Windows, Linux, or an Intel-based Mac can prepare the bootable USB.

Who it's for

Choose MemTest86 when the job is to isolate RAM as a cause of instability, verify memory in a build, or produce a report that can guide component diagnosis. Free Edition is appropriate for straightforward checks within its 16-core ceiling. Pro is the better fit for repeatable automated tests or systems with more cores; Site is aimed at organizations that need to deploy testing across a LAN. Look elsewhere for broad hardware maintenance or for Apple Silicon Mac testing.

Pros and cons

Pros: Standalone booting tests RAM without relying on an installed operating system, useful when investigating unstable machines.
Pros: Fourteen algorithms and support across several memory generations and types give it broad RAM diagnostic coverage.
Pros: HTML reports and configuration-dependent error decoding can help document results and pinpoint a component.
Pros: Pro and Site add meaningful scale-up options, from automated custom tests to PXE deployment and console reporting.
Cons: UEFI and x86 or ARM64 requirements, plus the Apple Silicon exclusion, limit which systems can run version 11.7.
Cons: Free Edition tops out at 16 CPU cores and relies on forum support; phone and email support require a paid edition.
Cons: Pro’s per-machine license and Site’s organization-and-country boundary constrain how licenses can be used.

Alternatives

For broader category browsing, see Hardware Diagnostic Software or PC Overclocking Software.

smartmontools is a free option for Linux, macOS, and Windows with the smartctl and smartd utilities; choose it instead when those utilities suit the task.
stress-ng is free across Android, Linux, macOS, self-hosted, and Windows; it may suit readers seeking a free alternative across those platforms.
Hard Disk Sentinel offers a trial and free Linux and DOS plans; consider it instead when those plans fit your needs.
MemTest86+ is a free, open-source standalone memory tester under GPLv2 for private or commercial use; choose it if that licensing model is the priority.
PC-Doctor Toolbox has a free personal-use plan for up to five systems that requires a Toolbox Remote account and opts into technical and interaction data sharing; it may fit personal multi-system use.
Blackwire Drive Eraser & Sanitizer is a Windows drive-erasure tool, rather than a RAM tester.
HDAT2 is freeware for Windows; consider it as another free option when its scope fits.
Intel VTune Profiler is a free download for Linux, self-hosted, and Windows; choose it instead when that tool fits your work.

Verdict

MemTest86 is a sound choice for anyone who needs dedicated, bootable RAM diagnostics, especially builders and repair teams who value reports or repeatable testing. Its free edition covers basic checks, and Pro and Site offer clear paths to automation and deployment. The main reasons to look elsewhere are incompatible Apple Silicon hardware, needs beyond memory testing, or a requirement to avoid paid per-machine licensing for Pro.

	MemTest86	Prime95
Free plan	Yes	No
Free trial	No	No
Paid from	Free	—
Open source	No	No
Platforms	Linux, macOS, self-hosted, Windows	Windows, macOS, Linux
Free plan	Yes	Yes

MemTest86 vs Prime95

MemTest86

Prime95