OCCT vs stress-ng

OCCT is a PC tool for stability and stress testing, benchmarking, and system monitoring. Its tests cover CPU, GPU, memory, VRAM, and power supplies, while CPU and memory benchmarks include memory latency and bandwidth measurements. System monitoring and system information use HwInfo. OCCT runs on Windows and Linux. The free Personal edition is for individual use, including PC enthusiasts, overclockers, and gamers, and cannot be used in a commercial or business environment. Personal users need one license per household. Supporter costs €4.50 per month and adds unlimited test duration, no wait time, test reports, and stability certificates; Supporter+ costs €7.00 per month and adds more certificate slots. Pro, Enterprise, and Enterprise+ are the editions directed to business users, with prices available on request, and professional licenses are specific to Windows or Linux. Enterprise includes JSON, CSV, and PDF report export and command-line test automation. It can also run portably from a USB drive or network location without installation or internet access; the On-Premise option keeps system and test data within the customer's infrastructure.

stress-ng is a free utility for loading computer subsystems and operating system kernel interfaces with stress tests. Its project lists more than 390 tests, including suites for CPU, virtual memory, filesystems, and memory or CPU caches. CPU tests exercise floating-point, integer, bit-manipulation, and control-flow operations. Listed architecture coverage includes ARM, x86-64, RISC-V, MIPS, Power, SPARC, and s390x. The project originally aimed to reveal hardware problems such as thermal overruns and operating system bugs under heavy load. stress-ng can report test throughput to help observe performance changes between operating system releases or hardware types, but the project says it is not a precise benchmark suite. Some tests may heat poorly designed hardware or create excessive system thrashing that is hard to stop. On Linux, running as root adjusts out-of-memory settings so stressors can become unkillable in low-memory conditions; the README advises careful use. The project documents Docker snapshots and installation on recent Ubuntu releases through its PPA. It is licensed under GPL-2.0 and costs nothing.