OCCT vs Prime95

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.

Prime95 is free Mersenne-prime search software for people who want to contribute computing work to GIMPS. It can also put a sustained workload across CPU cores to check processor and L1, L2, and L3 cache stability. For project tasks, Prime95 contacts PrimeNet for work; users can monitor computer progress and manage assignments remotely through the account’s CPUs page. Listed work includes PRP and Lucas-Lehmer tests, P-1 and ECM factoring, and trial factoring. Downloads include Windows, Linux, Mac OS X command-line, and FreeBSD builds. Administrators can choose a GUI-less Windows service build, which is intended for Windows Server experts. The source archive covers Windows, Linux, FreeBSD, and Mac OS X, though the code is described as non-portable. Version 30.3 introduced a dialog for limiting resource use. GIMPS participation is free and open internationally. The license permits indefinite free use on computers users own or are authorized to use, and provides the software as-is without warranty.