What is deltat?

DeltaT is a Windows system tray application that watches your computer's CPU, GPU, and drive temperatures over time and learns what normal actually looks like for your specific machine. Most temperature monitoring tools just show you a number. This one tries to explain why that number is high, ranking possible causes like dried out thermal paste, dust buildup, a failing fan, a loose cooler mount, an overclock you applied yourself, or simply a hot room, and it shows its reasoning in plain language rather than a single confusing score. It works by comparing many signals rather than one raw temperature. Degraded paste behaves differently from dust, which behaves differently from a weak fan or a loose mount, so DeltaT looks at how quickly heat rises and falls, how hard the fans are working, and how much power the chip is actually drawing, then corrects for outside weather, fan speed, and wattage so none of those normal variations get mistaken for hardware failing. It also accounts for things like CPU boost settings, battery versus plugged in power limits, and hard frequency caps, since all of these change temperatures for reasons that have nothing to do with cooling problems. Reading chip temperatures normally requires a kernel level driver, and older tools including earlier versions of DeltaT used one called WinRing0, which is flagged by Windows Defender and blocked by many anti-cheat protected games. DeltaT has moved to a newer, signed driver called PawnIO that avoids those issues, so games launch normally while it runs. Declining the driver entirely is also an option, in which case DeltaT still reports fan, GPU, drive, and battery data, and real CPU temperature on supported laptops through the manufacturer's own firmware channel. Nothing measured leaves your machine, there is no account, telemetry, or cloud connection involved, aside from checking the local weather to correct its readings.