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Head-to-head · PC Stress Testing Tools

OCCT vs MemTest86

  • Updated Oct 2026
  • Both researched from official sources
  • 1 check side by side
Higher score OCCT #1 in PC Stress Testing Tools 8.9/10 Free plan Free plan✓ 0 of 5 features Visit OCCT
MemTest86 #6 in PC Stress Testing Tools 8.2/10 Free plan Free plan✓ 0 of 5 features Visit MemTest86

OCCT leads on 0 checks, MemTest86 on 0, and 1 is even. Who comes out ahead on the 1 yes/no, price and count check where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreOCCT · 8.9/10
  • Free planboth

OCCT scores higher on our rubric for pc stress testing tools: 8.9 against 8.2 out of 10; our editors rank them #1 and #6.

OCCT is the better fit for all-around PC stability and component testing. MemTest86 is the better fit for bootable RAM diagnostics and detailed fault reporting.

  • OCCT fits best

    All-around PC stability and component testing

  • MemTest86 fits best

    Bootable RAM diagnostics and detailed fault reporting

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. How we rank.

Side by side

Feature OCCT 8.9/10 Visit ↗ MemTest86 8.2/10 Visit ↗
At a glance
Editor score 8.9 8.2
Ranking #1 in PC Stress Testing Tools #6 in PC Stress Testing Tools
Best for All-around PC stability and component testing Bootable RAM diagnostics and detailed fault reporting
Pricing model Free plan + paid Free plan + paid
Starting price — $76/yr
Free plan ✓ ✓
Free trial — —
Deployment Desktop Desktop
Platforms Windows, Linux Windows, macOS, Linux
Support Community, Docs Email, Phone, Community, Docs
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features OCCT 0/5 · MemTest86 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 CPU, memory, GPU and VRAM, storage, and power-supply loads
  • Includes real-time hardware monitoring, system information, and benchmarking
  • Paid Supporter plans add reports and stability certificates
  • 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
Cons
  • The free Personal edition is limited to personal use
  • Commercial use requires a professional license
  • Intel-focused tuning does not provide broad memory-tuning controls
  • 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
Our verdict

OCCT is a desktop application for testing PC stability, monitoring hardware, benchmarking performance, and validating systems. Its component coverage suits gamers, PC enthusiasts, overclockers, system integrators, IT administrators,…

Read the review →

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 →
  1. OCCTPC Stress Testing Tools 8.9Free plan
  2. MemTest86PC Stress Testing Tools 8.2Free plan

Strengths and trade-offs

  • OCCT — where it wins

    • Tests CPU, memory, GPU and VRAM, storage, and power-supply loads
    • Includes real-time hardware monitoring, system information, and benchmarking
    • Paid Supporter plans add reports and stability certificates

    Where it doesn't

    • The free Personal edition is limited to personal use
    • Commercial use requires a professional license
    • Intel-focused tuning does not provide broad memory-tuning controls

  • 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
  • OCCT8.9/10 · Free plan

    Broad component testing for PC stability, with free personal use and paid reporting options.

    Visit OCCTFull verdict →
  • MemTest868.2/10 · Free plan

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

    Visit MemTest86Full verdict →

More comparisons

All PC stress testing tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update