TDP (Thermal Design Power)
The maximum amount of heat a CPU or GPU generates under load, measured in watts. Determines cooling requirements and power supply sizing.
What is TDP?
TDP stands for Thermal Design Power. It's a specification — measured in watts — that indicates the maximum amount of heat a processor generates under sustained workload. Cooling solutions are designed around this number: a CPU with a 65W TDP needs a cooler rated for at least 65W of heat dissipation.
Important distinction: TDP is not the same as power consumption. A CPU with a 105W TDP might briefly draw 150W during all-core boost (called PBP and MTP on Intel, PPT on AMD). TDP represents the sustained thermal output the cooler must handle, not peak electrical draw.
TDP across different components
CPUs: Modern desktop CPUs range from 65W (efficient chips like the Ryzen 5 9600X) to 253W (high-end like the Core Ultra 9 285K). Laptop CPUs run 15-55W.
GPUs: GPU TDP ranges from 150W (budget cards like the RTX 5060) to 575W (the RTX 5090). GPU TDP directly affects the minimum PSU wattage you need and how much heat your case must exhaust.
Total system: Add CPU TDP + GPU TDP + ~100W for other components to estimate total system power draw. A system with a Ryzen 7 9800X3D (120W) and RTX 5070 (250W) draws roughly 470W total, so a 650-750W PSU provides adequate headroom.
Frequently Asked Questions
Do I need a bigger cooler for higher TDP?
Yes. A 65W CPU runs fine on a stock cooler or budget tower cooler ($20-30). A 170W+ CPU needs a premium tower cooler ($40-60) or AIO liquid cooler ($80-150). Matching cooler to TDP is critical for avoiding thermal throttling.
Does lower TDP mean worse performance?
Not necessarily. Architectural efficiency varies. The Ryzen 7 9800X3D at 120W TDP outperforms the Core Ultra 9 285K at 253W TDP in gaming, because AMD's Zen 5 + 3D V-Cache delivers more performance per watt.