The best CPU and GPU temperature monitoring software for most people is HWiNFO64 on Windows: it reads per-core CPU temperatures, package temperature, GPU core and hotspot/junction sensors, VRM and NVMe drive sensors, logs everything to CSV, and can fire threshold alerts, all free for personal use. If you want temperatures drawn on screen while you game, MSI Afterburner paired with RivaTuner Statistics Server is the standard overlay stack, and AIDA64 Extreme is the paid pick when you need scheduled logging and email or auto-shutdown alerts. On macOS, iStat Menus and the free Stats cover the same ground; on Linux, lm-sensors plus psensor or nvtop do it from the terminal or a light GUI.
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Quick comparison of the main picks
| Pick | Best for | Key specs | Price range |
|---|---|---|---|
| HWiNFO64 | Best overall (Windows) | Per-core CPU, package, GPU core + hotspot/junction, VRAM, VRM, NVMe, fan RPM; polling roughly 500 ms and up; CSV logging; threshold alerts | Free for personal use; paid Pro license for commercial use |
| MSI Afterburner + RTSS | Best in-game overlay | On-screen display of CPU/GPU temp, clocks, power, FPS and frame time; polling from 100 ms; hardware log file | Free |
| AIDA64 Extreme | Best paid logging and alerting suite | Sensor panel, CSV/HTML export, email and auto-shutdown alerts, built-in stress tests | Roughly $40–60 for a single-PC license |
| Libre Hardware Monitor / Core Temp | Best free lightweight options | Core Temp: per-core CPU only, overheat shutdown action; Libre Hardware Monitor: CPU, motherboard Super I/O, GPU, storage | Free |
| GPU-Z | Best GPU-only detail | Core and memory clocks, power draw, memory junction on GDDR6X cards, BIOS readout, CSV sensor log | Free |
| iStat Menus / Stats / TG Pro | Best on macOS | Menu-bar CPU/GPU temperature, fan RPM, alerts; fan control mainly on Intel Macs | Free (Stats) up to roughly $12–20 per Mac |
| lm-sensors + psensor / nvtop | Best on Linux | CLI and light GUI, per-core CPU, GPU via nvtop or nvidia-smi, JSON and CSV output for logging | Free |
Best overall: HWiNFO64
HWiNFO64 is the tool that covers the most sensors on a typical Windows desktop without asking for money. It reads per-core CPU temperatures and the package sensor, CPU clocks and power where the chip exposes them, GPU core temperature plus hotspot or junction temperature on cards that report it, VRAM and memory-junction readings, motherboard Super I/O rails, VRM temperatures on boards that expose them, NVMe drive temperatures, and fan speeds. The sensor window supports a configurable polling interval, typically from about 500 ms upward, and every value can be logged to a CSV file or graphed in place.
It also handles alerting natively: you can set a threshold on any sensor and have HWiNFO play a sound, show a notification, or shut the machine down. The trade-offs are real, though. The interface is dense and intimidating on first launch, there is no built-in on-screen overlay, and the free personal-use build limits the shared-memory interface that overlays read from to a 12-hour session per the developer’s documentation — restarting the tool resets it. If you run it commercially, the developer asks you to buy a Pro license.
Best for gaming overlay: MSI Afterburner with RivaTuner Statistics Server
MSI Afterburner installs RivaTuner Statistics Server alongside it, and together they are the most widely used way to put CPU and GPU temperatures on screen inside a game. The overlay can show GPU core and hotspot temperature, CPU package and per-core temperature, clock speeds, power draw, fan speed, memory usage, plus framerate and frame time from RTSS itself. The hardware polling interval is adjustable down to 100 ms, and Afterburner writes a hardware log you can open in a spreadsheet after a session.
It suits anyone who wants to see thermals without alt-tabbing, and monitoring works on GPUs from any brand — some voltage-control options are restricted depending on the card. The main trade-off is that two programs are doing the work, so you have two settings windows and two things to keep updated. It is also a poor fit if you only want a quiet background log; use HWiNFO64 for that and enable the overlay only when you need it.
Best paid suite: AIDA64 Extreme
AIDA64 Extreme is what you buy when monitoring has to be reliable and hands-off. It offers a configurable sensor panel, CSV and HTML export, scheduled logging, and alerts that can send an email, launch a program, or shut the system down when a sensor crosses a limit — useful for a rendering or simulation machine that runs unattended overnight. The same package includes stress tests, so you can validate that a cooler change actually lowered temperatures under load rather than just at idle.
It suits small studios, workstation owners, and anyone monitoring several machines. The trade-off is the price, roughly $40–60 for a single-PC license depending on edition and region, and a sensor panel that takes some layout work before it looks the way you want.
Best free and lightweight: Libre Hardware Monitor and Core Temp
If you only care about CPU temperature and want the smallest possible footprint, Core Temp reads per-core CPU temperatures, shows them in the taskbar or a small window, and includes an overheat protection action that can sleep, restart, or shut down the PC at a threshold you set. It does not monitor GPUs, which is its main limitation.
Libre Hardware Monitor, the community-maintained fork of Open Hardware Monitor, covers more ground: CPU cores and package, motherboard Super I/O sensors, GPU temperature through the vendor APIs, and storage temperatures, all in a simple tree view with a built-in chart and a log export. It is free and open source, but development is slower than the commercial tools, so brand-new chipsets and GPUs sometimes take a while to appear correctly, and there is no alerting beyond the graph.
Best for GPU-only deep detail: GPU-Z
GPU-Z is the specialist pick. It reports GPU core and memory clocks, power draw, board power limits, memory junction temperature on cards that expose it, BIOS version, and driver details, and its Sensors tab logs to CSV. It is the right tool for checking whether a card is thermally throttling or hitting a power limit, and it is free. It does not monitor the CPU, has no overlay, and no alerting, so it is a companion rather than a primary monitor.
Best on macOS: iStat Menus, Stats, TG Pro
On macOS, iStat Menus puts CPU and GPU temperature, fan RPM, and load in the menu bar with configurable notifications when a sensor passes a threshold; it is a paid app in the roughly $12–20 range depending on license type. Stats is a free, open-source menu-bar alternative that covers CPU, GPU, and memory without a subscription. TG Pro adds more aggressive fan control and logging, and Macs Fan Control offers a free tier with a paid Pro version.
The important caveat is hardware-dependent: fan control works best on Intel Macs, while Apple Silicon machines expose temperatures but give third-party tools much less authority over fan curves, which are managed by the system. If you are on an M-series laptop, pick based on menu-bar presentation and logging rather than fan control promises.
Best on Linux: lm-sensors with psensor or nvtop
Linux splits the job by layer. The lm-sensors package, set up with sudo sensors-detect, reads CPU and motherboard sensors from the kernel and prints them with the sensors command; the same data is available as JSON via sensors -j for scripting. psensor adds a desktop GUI with graphs and alerts, while nvtop gives a real-time GPU view for NVIDIA, AMD, and Intel graphics. For headless servers, a single command like nvidia-smi --query-gpu=temperature.gpu --format=csv -l 5 logs GPU temperature every 5 seconds, and a cron or systemd timer can append CPU readings to a CSV file. Everything here is free.
How to choose, with numbers
- Count the sensors you actually need. A useful desktop setup covers at least four groups: CPU package plus per-core, GPU core plus hotspot/junction, storage, and motherboard/VRM if your board exposes it. If a tool covers three of those, you will end up running a second one.
- Set polling to match the physics. Thermal mass means temperatures move over seconds, not milliseconds, so 1,000 ms is enough for trend logging. Drop to 100–500 ms only when you are hunting transient spikes during a benchmark, and expect a small CPU cost at that rate.
- Estimate the log size before you leave it running. A row of about 40 sensors is roughly 400 bytes in CSV. At one sample per second that is about 1.4 MB per hour, roughly 35 MB per day, and a little over 1 GB per month. At 100 ms — ten times per second — the same setup writes about 14 MB per hour, 345 MB per day, and around 10 GB per month. Log to a separate drive or rotate the file if you plan to keep 100 ms logging on.
- Decide whether you need alerts or just graphs. Alerts matter for unattended machines. Set them 5–10 °C below the vendor’s published limit: many current desktop CPUs list a maximum junction temperature around 95–100 °C (Intel lists 100 °C for many parts, AMD’s Ryzen 7000 and 9000 series list 95 °C), so an 85–90 °C alert catches a failing cooler before throttling starts. On GPUs that expose junction temperature, AMD’s RDNA cards list a junction limit of about 110 °C, so an alert near 100 °C is a sensible early warning.
- Match the platform. Windows has the widest choice; macOS and Linux each have a small, mature set, and cross-platform tools rarely cover fan control on Apple Silicon.
Decision matrix: your situation to your pick
| Your situation | Pick | Why |
|---|---|---|
| Windows desktop, want one free tool for everything | HWiNFO64 | Widest sensor coverage, CSV logging, alerts, no cost for personal use |
| You game and want temps visible without alt-tabbing | MSI Afterburner + RTSS | Overlay with FPS and frame time; works on any GPU brand |
| Unattended workstation or render node | AIDA64 Extreme or Argus Monitor | Email and auto-shutdown alerts, scheduled logging |
| Older or low-power laptop, minimal overhead | Core Temp or Libre Hardware Monitor | Small footprint; Core Temp adds an overheat shutdown action |
| Diagnosing GPU throttling or power limits | GPU-Z | Clocks, power draw, and memory junction in one panel |
| Mac laptop, mostly want menu-bar readings | Stats (free) or iStat Menus (paid) | Low overhead, menu-bar temperatures, threshold notifications |
| Linux desktop or server | lm-sensors + psensor / nvtop | Kernel-level sensors, scriptable JSON/CSV logging, free |
Setup and ownership realities worth knowing
Sensor labels lie more often than readings do. Motherboard readings tagged “TMPIN” or “System” frequently point at a sensor the board vendor never documented, and the number may be meaningless or offset. Trust the CPU package, per-core, GPU, and NVMe readings first; treat unknown motherboard entries as hints, not facts.
Two overlays will fight. Running RTSS, a game launcher overlay, and a GPU vendor overlay at once is a common cause of stutter or a game that refuses to launch. Keep one overlay active per game.
Kernel-level sensor drivers can trip anti-cheat. Monitoring tools that install a low-level driver for hardware access sometimes conflict with anti-cheat systems. If a multiplayer game fails to start or crashes on launch, close the monitoring tool and retry before troubleshooting anything else.
Idle spikes are normal on modern CPUs. A core jumping briefly to 70 °C at idle, or a package reading that flickers, is typical of how boost algorithms behave; judge cooling by sustained load averages, not by the maximum value the log recorded.
Nothing in the software wears out, but your settings can. The common ownership mistakes are leaving 100 ms logging on until the drive fills, setting alerts so tight that they fire during normal boost behavior, and relying on a tool that stopped updating for your chipset. Re-check coverage after a major platform upgrade — a new CPU generation or GPU series is exactly when sensor support gaps appear.
Monitoring on phones and tablets
Since phones have no exposed CPU or GPU temperature API for general apps, Android tools such as AIDA64 for Android and DevCheck read the kernel thermal zones where the chipset exposes them, so coverage varies by manufacturer and some devices show only a coarse thermal state rather than degrees. On iOS and iPadOS, third-party apps cannot read temperature sensors at all — the system exposes only a thermal pressure state, and apps report throttling indirectly. Treat mobile readings as directional, and use them to spot sustained overheating during charging or heavy gaming rather than as precise measurements.
Frequently Asked Questions
Is HWiNFO64 really free?
Yes, for personal use. The developer provides the full sensor set, logging, and alerting at no cost for non-commercial use and sells a Pro license for commercial deployments. One documented limitation of the free build is that the shared-memory interface used by third-party overlays runs for a 12-hour session, after which you restart the tool to reset it.
Why do two monitoring tools show different temperatures?
They usually sample different sensors or apply different offsets. One may report the CPU package sensor while another reports the hottest core, and motherboard utilities often apply vendor offsets to Super I/O readings. Compare the same sensor name across tools, and prefer the CPU package, per-core, and GPU core readings for decisions.
Can I check CPU or GPU temperature without installing anything?
Often, yes. Windows 11 Task Manager shows GPU temperature on many systems in the Performance tab, NVIDIA’s app includes a statistics overlay, and AMD’s Adrenalin software has a performance metrics overlay with logging. These built-in options are fine for a quick check but rarely offer per-core CPU readings, historical logs, or threshold alerts.
Do monitoring tools reduce gaming performance?
Background logging at a 1-second interval is effectively free on any modern CPU. The measurable cost comes from the overlay hook and from aggressive polling: at 100 ms across dozens of sensors, plus an on-screen display, low-end processors can lose a small amount of performance. If you suspect an impact, benchmark with the overlay on and off using the game’s own benchmark mode.
How do I set a useful overheat alert?
Find your component’s published maximum, then set the alert 5–10 °C below it. Many desktop CPUs list a maximum junction temperature around 95–100 °C, and AMD’s RDNA GPUs list a junction limit near 110 °C, so alerts around 85–90 °C for CPU and 100 °C for GPU junction give you warning before throttling or shutdown. Test the alert once by lowering the threshold temporarily so you know it actually fires.
Which tool should I use on a Mac with Apple Silicon?
Stats is the best free choice for menu-bar temperature and load readings, and iStat Menus is the polished paid option with notifications. Expect temperature and fan RPM readings to work well, but treat fan-curve control as limited: Apple Silicon manages cooling in firmware, and third-party tools have far less control than they do on Intel Macs.
