Thank you for contacting ASUS.
This is **** and I will be assisting you with the issue you have posted.
Firstly, would you please tell us when and after what action this problem occurred? Did the problem exists when you first using this card?
Secondly, the VGA card requires supplementary power. Before booing your PC, please make sure you connect the supplementary power connectors.
Please refer to this link and choose the corresponding PSU:
Thirdly, please check if there is any updated BIOS or driver for your other PC components.
Otherwise please change this card to another PC to test.
Sorry for any inconvenience brings to you.
Thanks a lot for your kindly understanding and support!
I look forward for your response with all the details to assist you.
ASUS Customer Service Center
This problem first occurred yesterday after I started a stability and artifacting test. Prior to this, I had not observed this LED lit up at any time, even during POST. I had used SmartDoctor to make voltage, engine, and memory adjustments, then began the test. After about 15 minutes everything stopped and my screen got a checker board pattern. During the test I had opened my case to allow cooler air to the graphics card and noticed that the D601 LED was lit after everything stopped working. After resetting my PC, the LED went out but I have been unable to adjust anything with SmartDoctor and maintain stability.
I have a Zalman ZM850-HP 850W PSU installed in my PC. All supplementary
(2x6pin PCI plugs) have been pulled and reseated. All hardware BIOS and
drivers are up to date.
A positive is that my temperatures have been noticeably lower since I set the new OC. My idle temperature has been ~46-48C with the stock fan at 40%-60% (SmartDoctor Smart Cooling) and my load temperature has never gotten above ~71C. The VDDC Slave temperature under load have never exceeded 90C, although it should be noted that I was using Furmark to obtain these temperatures and not OCCT GPU.
Now I have received a second email from ASUS Technical Support advising reinstalling ASUS Catalyst 9.7, GamerOSD, and SmartDoctor.
|Dear Mr. ************,
Thank you for contacting ASUS Customer Service.
My name is **** and it's my pleasure to help you with your problem.
Firstly, “the LED is still lit”, the phenomenon is not normal.
Secondly, please reinstall these drivers manually:
Welcome to refer Troubleshooting & FAQ for ASUS products in ASUS website:
Troubleshooting - http://support.asus.com/troubleshoot...Language=en-us
FAQ - http://support.asus.com/faq/faq.aspx?SLanguage=en-us
If you continue to experience issues in the future, please do not hesitate to contact us.
ASUS Customer Service
If you have any suggestions or feedback about our technical support service, please e-mail to Manager_TMSS@asus.com. We will then arrange for a specialist to work with you regarding your issue. Your suggestions and feedback are appreciated and allow us to provide better service.
So as a final note, I've seen nothing more happen since I ran the GPU test with OCCT and the D601 LED has not returned. This leads me to believe that the OCCT GPU test is the cause and I have verified that it has discovered a design flaw with the VRMs in at least the reference design ATi HD 4890 graphics cards. Yes, OCCT does put unrealistic stresses on the graphics card during the test, but that is why I like it, it maxes out the capabilities of my card. So for now OCCT is off of my GPU testing list.
Now it looks like I can proceed with the installation of the aftermarket coolers on my 4890 and my testing of my temperatures before & after MX-3.