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Microsoft Ntttcp is a command-line Windows network throughput benchmark tool developed by Microsoft Corporation to measure raw TCP and UDP performance between two endpoints, enabling administrators, driver writers, and hardware vendors to isolate and quantify network stack bottlenecks without the overhead of disk or application-layer processing. Designed for precision testing of 10 Mb, 1 Gb, 10 Gb, 25 Gb, 40 Gb, 50 Gb, and 100 Gb adapters and switches, the utility spawns multiple parallel threads that pin CPU cores, saturates the link with buffered traffic, and reports per-thread and aggregate throughput, CPU utilization, latency histograms, and retransmission counts in easily parsed CSV or XML formats. Typical use cases include validating NIC firmware upgrades, comparing driver builds, tuning advanced registry parameters such as RSS, RSC, or chimney offload, certifying datacenter equipment before deployment, and reproducing customer-reported performance regressions under controlled conditions. Because the tool operates entirely in memory, it eliminates storage variables and produces consistent, repeatable metrics that map directly to the theoretical line rate. The current release, version 5.40.0.99012574, is the first public build published to the Microsoft Windows package repositories and ships as a compact, digitally signed x64 executable compatible with Windows 10, Windows 11, Windows Server 2016, 2019, and 2022. Users can invoke ntttcp.exe in sender or receiver mode on separate hosts, configure port ranges, buffer sizes, thread counts, and run-time duration, then merge results into Excel or PowerBI for regression analysis. Microsoft Ntttcp is available for free on get.nero.com, with downloads provided via trusted Windows package sources (e.g. winget), always delivering the latest version, and supporting batch installation of multiple applications.
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