abyse wrote on 2025-12-28, 10:58:

Hello everyone, I have a 4670 AGP 1GB video card that has a blue LED on the PCB. Under normal operation, the LED remains off; ho […]
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Hello everyone,
I have a 4670 AGP 1GB video card that has a blue LED on the PCB.
Under normal operation, the LED remains off; however, during heavy gaming it flickers. The LED does not stay continuously lit and instead flickers briefly under load, similar in behavior to an HDD activity indicator.

I would like to understand what this blue LED actually indicates.

Is this blue LED a GPU activity indicator? Is this normal behavior for this type of GPU card?

Thanks in advance!

Welcome to Vogons 😀

Far as the blue LED goes, I see some online user reviews which claim it's connected to whether the additional power cable is plugged in or not.

AI returns the following...

"The HIS HD 4670 IceQ AGP graphics card requires supplementary power via a 4-pin Molex connector. It also features an LED indicator near the power connector to confirm the power connection status.

Power Connector Details

Connector Type: The card uses a single standard 4-pin Molex peripheral power connector, not a modern 6 or 8-pin PCIe power connector.
Power Supply Requirement: AMD recommends a minimum 400 Watt power supply that can provide sufficient current on the +12 Volt rail and has an available 4-pin Molex connector.

LED Indicator Function
The card includes an LED (Light Emitting Diode) near the power socket, typically on the edge facing the front of the computer case when installed. This LED's primary function is to indicate whether the auxiliary power cable is connected correctly:

LED On (lit): This typically means the card is receiving the necessary auxiliary power from your PSU (Power Supply Unit) via the Molex connector.
LED Off (unlit) or Red (depending on specific model design): This would likely indicate that the power cable is either not plugged in, incorrectly seated, or there is an issue with the power delivery from the PSU.

Ensuring this connector is properly plugged into a live Molex plug from your power supply is crucial for the card to operate correctly and stably."

https://youtube.com/shorts/cw-QBT-Dxf4?si=YCMGoMfF0rvF3Eoy I searched videos on YouTube but all these GPUs had the blue LED off, I will post a video to show how my GPU lights up during gameplay...

abyse wrote on 2025-12-28, 14:25:

https://youtube.com/shorts/cw-QBT-Dxf4?si=YCMGoMfF0rvF3Eoy I searched videos on YouTube but all these GPUs had the blue LED off, I will post a video to show how my GPU lights up during gameplay...

Here is a video how my GPU behave: https://youtu.be/sq4bnjJ7PUA?si=DVzdtXm8j11pr8RZ

Would it be possible for you to produce sharp close up pictures front and back of that section of the card? Perhaps that will already shed some light on it.

I had a X1650Pro AGP IceQ and that LED was off all the time as well. I never gone as far as testing if the LED is even still functional or not.

tehsiggi wrote on 2025-12-28, 16:09:

Would it be possible for you to produce sharp close up pictures front and back of that section of the card? Perhaps that will already shed some light on it.

I had a X1650Pro AGP IceQ and that LED was off all the time as well. I never gone as far as testing if the LED is even still functional or not.

Close-up vid:https://youtu.be/vvYWLYeJdS0?si=rNsfXBJgYrXz57Il

Extra pics, cable management with the ultra x-connect 500w psu, recapped with nippon chemi-con caps.