Why CPU GHz Doesn’t Matter!
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Go to nordpass.com and use code LINUS to get 74% off a 2 year NordPass Premium plan plus 4 free months! Get your Arozzi Occhio True Privacy webcam today at: lmg.gg There is a lot more to IPC than just clock speed, so we took two AMD CPUs with the same core count and similar speeds and pitted them against each other. How well will they perform when underclocked? The results might surprise you! Buy AMD Ryzen 5 3600XT CPU: geni.us Buy AMD Ryzen 5 5600X: geni.us Buy G.Skill Trident Z RGB 2x8GB 3600MHz: geni.us Buy Noctua NH-D14 CPU Cooler: geni.us Buy ASUS TUF Gaming B550-PLUS: geni.us Buy Crucial P5 1TB NVMe SSD: geni.us Buy SeaSonic X750 Gold PSU on Amazon: geni.us Buy EVGA GeForce RTX 3060 XC: geni.us Purchases made through some store links may provide some compensation to Linus Media Group. Discuss on the forum: linustechtips.com ► GET MERCH: lttstore.com ► AFFILIATES, SPONSORS & REFERRALS: lmg.gg ► PODCAST GEAR: lmg.gg ► SUPPORT US ON FLOATPLANE: floatplane.com FOLLOW US ELSEWHERE --------------------------------------------------- Twitter: twitter.com Facebook: @LinusTech Instagram: @linustech TikTok: @linustech Twitch: twitch.tv MUSIC CREDIT --------------------------------------------------- Intro: Laszlo - Supernova Video Link: youtube.com iTunes Download Link: itunes.apple.com Artist Link: soundcloud.com Outro: Approaching Nirvana - Sugar High Video Link: youtube.com Listen on Spotify: spoti.fi Artist Link: youtube.com Intro animation by MBarek Abdelwassaa @mbarek_abdel Monitor And Keyboard by vadimmihalkevich / CC BY 4.0 geni.us Mechanical RGB Keyboard by BigBrotherECE / CC BY 4.0 geni.us Mouse Gamer free Model By Oscar Creativo / CC BY 4.0 geni.us CHAPTERS --------------------------------------------------- 0:00 Intro 0:57 The Test 1:59 5600x Faster, Why? 3:10 The Takeaways 4:15 If Not GHz, Then What? 5:15 IPC 7:16 CPU Design Factors 8:40 The Solution? 10:10 Outro
The video begins by challenging the common intuition that higher gigahertz automatically means a faster CPU. It explains that clock speed measures how fast transistors switch, but that metric alone is not enough to judge performance. The host runs a controlled test between two AMD CPUs, the Ryzen 5 3600XT and the Ryzen 5 5600X, using identical test benches to ensure fairness. They show that when underclocked to the same frequency, the performance differences can flip in unexpected ways, highlighting that other factors beyond GHz drive real-world results. The discussion then shifts to why manufacturers keep clock speeds in a limited range, citing power consumption and heat as major constraints. The host uses a mine analogy to describe how IPC, or instructions per clock, can explain why a lower clocked CPU can outperform a higher clocked one in certain tasks. The video also cautions against leaning too heavily on single benchmarks, noting how testing strategies and real-world workloads can skew perceptions of a CPU’s true capabilities. In practical terms, IPC is presented as a more nuanced and sometimes more revealing metric than clock speed alone, though it comes with its own measurement challenges. The overall message is that a fair comparison requires looking at a constellation of factors, including cores, threads, caches, branch prediction, and the architectural design that governs how efficiently a CPU handles different tasks.
Topics · science and technology · computers and hardware · performance benchmarking · cpu architecture
Questions answered
- Does CPU GHz matter in performance, and if so, in what way?
- Yes, GHz matters because it reflects how fast a CPU can switch transistors, but it is not the sole determinant of performance. Other factors like IPC, core count, cache design, and branch prediction also play crucial roles in real-world workloads.
- What is IPC and why is it important when evaluating CPUs?
- IPC stands for instructions per clock. It measures how much work a CPU can do in each clock cycle. Higher IPC means better performance at a given clock speed, but IPC depends on many design choices and cannot be measured by a single universal benchmark.