ROG Astral RTX 5090 OC vs Radeon RX 7900 XTX
tdpを並べて確認。
tdpを理解する
TDP is a thermal design specification. Coolers and chassis are designed to dissipate the TDP figure indefinitely without throttling.
Why it's not power consumption
Modern CPUs and GPUs can briefly exceed TDP during boost (Intel's PL2, AMD's PPT, NVIDIA's power limit). They also dip below TDP at idle. The TDP figure is the sustained-load expectation, not a constant draw.
Why it matters
- Laptops. Lower-TDP chips fit in thinner chassis with longer battery; higher-TDP chips need beefier cooling.
- Mini PCs. A 65 W chip in a 0.8 L chassis will throttle. A 35 W chip will not.
- Desktops. Drives PSU sizing and case fan choice.
In comparisons
Two CPUs with the same TDP and similar specs will usually feel similar in real-world use. Big TDP gaps (35 W vs 125 W) reliably predict large performance gaps under sustained load.
この対戦ROG Astral RTX 5090 OC's 600W is roughly 69% more than Radeon RX 7900 XTX's 355W (a 245W gap). Lower is better here, so Radeon RX 7900 XTX takes the lead in real use.
tdpとは？
Thermal Design Power — the maximum sustained heat output a CPU or GPU is designed to dissipate, measured in watts. A guide for cooler sizing, not an absolute power consumption number.
TDPの詳しい解説を読む →この比較の他のスペック
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