Need help understanding stuff like TDP
Need help understanding stuff like TDP
Here’s a revised version of your message:
So, below is a screenshot showing the Cinebench R20 results on my Asus Vivobook 14 with a Ryzen 5 4500U. The power adapter is 45W. Based on the CPU package specs, it was listed at 30W max. I think that’s likely the TDP for the processor. According to AMD guidelines, it should be around 15W, but OEM manufacturers can set it between 12-25W. Also, I’ve observed that both my CPU and iGPU can run at higher clock speeds when temperatures are low (around 70°C), which seems normal. However, they drop noticeably during longer tasks (like the one you’re seeing here at 14W). Any suggestions on how to prevent this? Thanks!
U-class chips have a power consumption of 15W. Contemporary CPUs can increase significantly to deliver faster performance, which also increases cooling demands. The reduced power usage during extended high-load periods comes from the boost phase. Your cooler likely won’t handle 30 watts from a CPU, so it maintains its speed without throttling. Additionally, a CPU drawing 30 watts on a 45WH battery would only provide about 1.5 hours of operation at full load.
TDP refers to the long-term cooling requirements, meaning the total heat you need to remove when the processor runs at full capacity over a long time. It doesn't guarantee it won't rise—sometimes it increases noticeably during brief spikes if the environment (temperature, power supply, BIOS settings) permits. You can adjust it with tools like AATU on Ryzen processors.
AATU stands for AMD Architecture Technology Unit. Regarding the Ryzen controller and ASUS Vivobook models, it may work depending on the specific setup. Lowering the voltage on the laptop’s APU through undervolting can improve thermal management and overall performance. It’s worth trying if you notice overheating or sluggishness.
Updated Ryzen Controller tool from GitHub https://github.com/JamesCJ60/AMD-APU-Tun...y/releases
Everyone understands this. Tech firms can't all agree on the same method, which makes sense.
Sorry for bringing it up, but I need additional assistance. As @Kilrah pointed out, I used AATU with TDP set to 20W and long/short boost at 20W. My setup was: when I began using the machine, performance dropped after about 30 minutes. I checked HWINFO64 for clock and power data and noticed the battery section. At load, the charge rate was -3.4W! That seems unusual. With a 45W charger, shouldn’t this affect the battery? My battery started at 80% and fell to 78% after that. I had to restart HWINFO64 because it was accidentally closed. Thanks! @Shimmy Gummi @DreamCat04
The APU alone accounts for 20W, but expect additional components like the display, motherboard, drive, and possibly another 10-20% due to power efficiency. The power system may have a limit and won’t exceed a certain value. Check the detailed temperatures in HwInfo—sometimes it’s the "skin temperature" that triggers throttling instead of the actual CPU or GPU temps. Look for when the skin temp stabilizes and performance drops, then consider adjusting it if needed.