Delta T
Delta T is the difference between a component's temperature and the ambient air, and it is the only fair way to compare cooling across rooms and seasons.
Also known as ΔT, temperature delta, delta over ambient
Not measurable from a browser
A browser cannot read temperatures, power draw, fan speed, VRAM capacity, clock frequency or native FLOPS. For a direct reading use a native monitor such as HWiNFO64, GPU-Z or lm-sensors. SystemCheck contributes the other half: whether the condition is costing you throughput, measured as decay and consistency.
An absolute temperature reading is meaningless without the room it was taken in. A CPU at 80 °C in a 20 °C room and one at 90 °C in a 30 °C room have identical 60 °C deltas and identical cooling performance. Comparing raw temperatures between two users, or between summer and winter on your own machine, is comparing rooms as much as coolers.
Delta T is also the right way to track degradation over time. If your delta at a fixed load grows from 55 °C to 68 °C over two years, the cooling system has genuinely degraded (dust, dried paste, a failing pump), and the change is real regardless of what the room was doing.
SystemCheck cannot measure delta T because it cannot read either the component temperature or the ambient temperature. Log the component side with HWiNFO64 and measure ambient with a cheap thermometer near the intake. What SystemCheck contributes is the performance side of the same story: whether the degraded cooling has begun to cost you throughput.
Related terms