GPU Fans Not Spinning? What 0dB Fan Stop Is and When to Worry

You install a new graphics card, power on the PC, look through the side panel… and the fans aren't moving. The first thought is that the card is faulty or installed wrong. In most cases the card is perfectly fine and the fans are stopped on purpose. This article explains fan-stop technology, which ASUS calls 0dB, when the fans stop and start, and when you should actually worry.

What is 0dB technology?

Many modern graphics cards stop their fans completely when the card is cool and lightly loaded, such as when browsing, watching YouTube or playing light games. According to ASUS's official support page, 0dB technology lets the fans stop spinning when the GPU core temperature meets set conditions, so you can enjoy light gaming in complete silence. If the temperature rises, the fans start up again automatically.

The idea is simple: why spin the fans, make noise and pull in dust when the card is already cool? The large metal heatsink can handle light loads passively.

When do the fans stop and start? (ASUS's official figures)

ASUS publishes a table of fan start and stop conditions for its RTX 30, 40 and 50 series cards. For the RTX 50 series, according to ASUS:

Fans start: when GPU temperature is above 55°C, or power draw is above 100W.
Fans stop: when temperature is below 50°C and power draw is below 50W and 0dB fan mode is switched on in GPU Tweak.

Note the difference between "or" and "and". The fans start if any one condition is met, but only stop when all of them are met together. ASUS notes that actual wattage and temperature may vary with product configuration, usage, operating conditions and power management settings.

Why the gap between 50°C and 55°C?

The gap is deliberate. If the start and stop points were the same number, the card would keep switching its fans on and off every few seconds as the temperature hovered around it, which is annoying and wears the fans for no reason. So manufacturers leave a gap: fans start at a higher temperature and stop at a lower one.

Does it harm the card?

No. Below 50°C is a low temperature for a graphics card, and the card is designed to work this way from the factory. As soon as a demanding game starts, power draw quickly rises above 100W and the fans start even before the temperature climbs. The feature does not let the card "run hot" for silence; it only applies under light load.

It also has benefits: a quieter PC while working and browsing, less dust pulled into the fans, and longer fan life because they are not spinning all day for nothing.

When should you worry?

The feature is normal, but some cases are worth checking:

Fans stopped while the temperature is high: open a monitoring tool such as GPU Tweak and check the temperature. If it is past the start condition (for example 55°C on ASUS RTX 50 cards) and the fans are still stopped, something is wrong.
Fans never start, even in heavy games: that is not normal.
Strange noise, or a fan that tries to spin and stops: something may be stuck.

According to ASUS, if the fan start condition is met but the fans still don't run, first update the driver to rule out a driver problem, and clean off dust with a small brush, as dust can stop a fan from spinning. If a fan is clearly stuck, contact support.

Test it yourself in a minute

Open a temperature monitoring tool and leave it running.
Run a game or light graphics test for a minute or two.
Watch temperature and power: once they pass the start condition, the fans should spin.
Close the game and wait: once temperature and power drop below the stop conditions, the fans stop again.

If that happens, congratulations, your card is working fine.

Can I keep the fans always on?

Yes. According to ASUS's table, fan stop requires 0dB mode to be switched on in GPU Tweak, so you can turn it off there if you prefer the fans to always spin. Most other brands have similar options in their own software, but names and figures differ by brand and model, so check your card's support page.

Tips to keep your card's fans healthy

Clean dust regularly: dust is one of the most common things that blocks fans and raises temperatures; a small brush is enough.
Look after case airflow: the graphics card draws air from inside the case, so a hot case means louder, busier fans.
Update drivers and the vendor app: some fan issues come from an old driver or a wrong software setting.
Don't change the fan curve at random: if you're unsure, keep the factory defaults.

Our pick at Gamerzone

If you want a balanced card for 1440p gaming with plenty of memory, the ASUS DUAL RTX 5060 Ti OC 16GB GDDR7 comes with dual Axial-tech fan cooling and is a practical choice for most builds. Check the current price on the product page.

FAQ

Do stopped GPU fans mean the card is broken?

Usually not. Most modern cards stop their fans when the card is cool and lightly loaded. The problem is when the temperature is high and the fans still don't spin.

When do ASUS RTX 50 fans start?

According to ASUS, when temperature exceeds 55°C or power draw exceeds 100W.

When do they stop?

When temperature is below 50°C, power draw is below 50W and 0dB mode is on in GPU Tweak, all at the same time.

Can I turn 0dB off?

Yes, in the manufacturer's software, such as GPU Tweak for ASUS cards.

Do all cards have this feature?

No. It varies by brand and model, and so do the figures. Check your card's support page or specifications.

Bottom line

Stopped fans on a graphics card are usually a sign of a smart card, not a broken one. Watch the temperature: if the fans spin under load and stop at rest, everything is normal.

Contact us

Questions about your card or want to upgrade? WhatsApp 0564121558 or visit our Olaya or Aqiq branch in Riyadh. Installments available with Tamara and Tabby.