MemTest86 vs Prime95

MemTest868.2Visit PPrime958.0Visit

Higher score MemTest86 #6 in PC Stress Testing Tools 8.2/10 Free plan Free plan✓ 0 of 5 features Visit MemTest86

vs

P Prime95 #7 in PC Stress Testing Tools 8.0/10 Free plan Free plan✓ 0 of 5 features Visit Prime95

• MemTest86 fits best

  Bootable RAM diagnostics and detailed fault reporting

• Prime95 fits best

  Established CPU and cache stability testing

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Side by side

Feature	MemTest86 8.2/10 Visit ↗	PPrime95 8.0/10 Visit ↗
At a glance
Editor score	8.2	8.0
Ranking	#6 in PC Stress Testing Tools	#7 in PC Stress Testing Tools
Best for	Bootable RAM diagnostics and detailed fault reporting	Established CPU and cache stability testing
Pricing model	Free plan + paid	Free
Starting price	$76/yr	Free plan
Free plan	✓	✓
Free trial	—	—
Deployment	Desktop	Desktop
Platforms	Windows, macOS, Linux	Windows, macOS, Linux
Support	Email, Phone, Community, Docs	Community, Docs
Built for	Solo, Small business, Mid-market, Enterprise	Solo, Small business, Mid-market
Features MemTest86 0/5 · Prime95 0/5
CPU stress testing	Not checked yet	Not checked yet
GPU stress testing	Not checked yet	Not checked yet
Memory stress testing	Not checked yet	Not checked yet
Combined system workload	Not checked yet	Not checked yet
Error detection	Not checked yet	Not checked yet
Specs
Platform support	Not checked yet	Not checked yet
Our review
Pros	Tests RAM from bootable USB or PXE media without an operating system 14 algorithms include Row Hammer detection, with ECC checks on supported hardware Pro adds customizable HTML reports, automation, and fault localization	Runs high-load torture tests across multiple CPU cores Tests CPU and L1, L2, and L3 cache stability Free on Windows, macOS, and Linux
Cons	Focuses on memory rather than whole-PC stress testing Pro Download starts at $116 USD as a one-time purchase Updates, downloads, and support beyond 12 months require an extension	Does not cover GPU or storage stress testing Focuses on CPU and cache workloads rather than broad component testing Support is through community resources and documentation
Our verdict	MemTest86 is standalone software for diagnosing RAM faults by booting from USB or network media, rather than running inside Windows, macOS, or Linux. It is aimed at system builders, PC repair stores, overclockers, manufacturers, and others… Read the review →	Prime95 is free desktop software for computer stability testing and participation in distributed Mersenne-prime searches. It suits people who want to put sustained load on a CPU, check cache stability, or run primality and factoring… Read the review →

Strengths and trade-offs

• MemTest86 — where it wins

  • Tests RAM from bootable USB or PXE media without an operating system
  • 14 algorithms include Row Hammer detection, with ECC checks on supported hardware
  • Pro adds customizable HTML reports, automation, and fault localization

  Where it doesn't

  • Focuses on memory rather than whole-PC stress testing
  • Pro Download starts at $116 USD as a one-time purchase
  • Updates, downloads, and support beyond 12 months require an extension

• Prime95 — where it wins

  • Runs high-load torture tests across multiple CPU cores
  • Tests CPU and L1, L2, and L3 cache stability
  • Free on Windows, macOS, and Linux

  Where it doesn't

  • Does not cover GPU or storage stress testing
  • Focuses on CPU and cache workloads rather than broad component testing
  • Support is through community resources and documentation

• MemTest868.2/10 · Free plan

  A focused RAM diagnostic tool with a free edition and paid reporting and deployment options.

  Visit MemTest86Full verdict →
• PPrime958.0/10 · Free plan

  A focused, free option for CPU and cache stability testing across Windows, macOS, and Linux.

  Visit Prime95Full verdict →