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Head-to-head · PC Stress Testing Tools

HeavyLoad vs MemTest86

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score HeavyLoad #4 in PC Stress Testing Tools 8.4/10 Free plan Free plan✓ 4 of 5 features Visit JAM Software
MemTest86 #6 in PC Stress Testing Tools 8.2/10 Free plan Free plan✓ 0 of 5 features Visit MemTest86

HeavyLoad leads on 0 checks, MemTest86 on 0, and 5 are even. Who comes out ahead on the 5 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreHeavyLoad · 8.4/10
  • Free planboth
  • Most featuresHeavyLoad · 4 of 5

HeavyLoad scores higher on our rubric for pc stress testing tools: 8.4 against 8.2 out of 10; our editors rank them #4 and #6.

HeavyLoad is the better fit for free Windows tests across CPU, GPU, RAM, and disks. MemTest86 is the better fit for bootable RAM diagnostics and detailed fault reporting.

  • HeavyLoad fits best

    Free Windows tests across CPU, GPU, RAM, and disks

  • 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 HeavyLoad 8.4/10 Visit ↗ MemTest86 8.2/10 Visit ↗
At a glance
Editor score 8.4 8.2
Ranking #4 in PC Stress Testing Tools #6 in PC Stress Testing Tools
Best for Free Windows tests across CPU, GPU, RAM, and disks Bootable RAM diagnostics and detailed fault reporting
Pricing model Free Free plan + paid
Starting price Free plan $76/yr
Free plan ✓ ✓
Free trial — —
Deployment Desktop Desktop
Platforms Windows Windows, macOS, Linux
Support Docs Email, Phone, Community, Docs
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features HeavyLoad 4/5 · MemTest86 0/5
CPU stress testing ✓ (best) Not checked yet
GPU stress testing ✓ (best) Not checked yet
Memory stress testing ✓ (best) Not checked yet
Combined system workload ✓ (best) Not checked yet
Error detection Not checked yet Not checked yet
Specs
Platform support Windows Not checked yet
Our review
Pros
  • Tests CPU, GPU, memory, and disk activity individually or together
  • Runs continuously or for a specified duration, with command-line controls
  • Offers an installer and portable version for USB use
  • 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
  • Windows-only, with no support for other listed platforms
  • Provides stress workloads, not the deeper reporting and error detection some buyers need
  • Documentation is the only listed support channel
  • 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

HeavyLoad is a free Windows utility from JAM Software GmbH for checking how PCs and server systems behave under resource-intensive conditions. It suits people who need to apply load to individual components or combine several workloads to…

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. HeavyLoadPC Stress Testing Tools 8.4Free plan
  2. MemTest86PC Stress Testing Tools 8.2Free plan

Strengths and trade-offs

  • HeavyLoad — where it wins

    • Tests CPU, GPU, memory, and disk activity individually or together
    • Runs continuously or for a specified duration, with command-line controls
    • Offers an installer and portable version for USB use

    Where it doesn't

    • Windows-only, with no support for other listed platforms
    • Provides stress workloads, not the deeper reporting and error detection some buyers need
    • Documentation is the only listed support channel

  • 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

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