CPU red led on motherboard

Jul 11, 2018
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So this are my specs:
Intel - Core i5-8400 2.8GHz 6-Core Processor
CPU Cooler Master - Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler
Gigabyte - B360 HD3 ATX LGA1151 Motherboard
Corsair - Vengeance LED 16GB (2 x 8GB) DDR4-3000 Memory
Kingston - A400 120GB 2.5" Solid State Drive
Seagate - BarraCuda 1TB 3.5" 7200RPM Internal Hard Drive
Power Corsair - CXM 550W 80+ Bronze Certified Semi-Modular ATX Power Supply

When I enable the XMP the cpu red led turns on on my MOBO (when I disable XMP it turns off), my pc looks working fine with no problem. I know that my mobo supports up to 2666mhz ram and I have 3000mhz and that could be the issue. Should I disable the XMP to remove the red light even if my pc looks working fne?
 
Solution
Your Core i5-8400 has an integrated GPU (Intel 630).
It won't perform as a dedicated GPU but it just to check for stability.
You motherboard supports DDR4 2666, 2400 and 2133 MHz memory modules.
You should run the memory at the fastest supported speed by motherboard, even though your RAM could run faster.
To run faster, more voltage (and timings tweaking) than the motherboard could provide might be required and that's why you get that red light.
 
Jul 11, 2018
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So that means that I can just ignore the red light and my pc will work fine with the xmp enabled or I should disable it?
When I enable the XMP my ram is locked at 2666mhz
 


Nope, that means, you should run the RAM at 2666MHz.

Your motherboard delivers around 1.2v at 2666MHz automatically and 3000MHz RAM might required 1.3v or more.voltage, which may have to be manually configured.

What's you RAM model number?
 
Jul 11, 2018
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I think this is the model number: CMU16GX4M2C3000C15
This is my ram:
https://www.corsair.com/Memory-Size/vengeance-led-configurator/p/CMU16GX4M2C3000C15
 
As you can see in the Corsair website @ 3000MHz that RAM it requires 1.35v (15-17-17-35 timings).
Your motherboard delivers around 1.2v automatically.
To avoid issues, you should run the RAM at 2666MHz, unless you could manually enter 1.35v and 15-17-17-35 timings.

 
Jul 11, 2018
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Thank you so much for your help and time!
 
Jul 11, 2018
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I already set my ram at 2666mhz manually, and the red light is still turning on :( it turns off when I leave it at 2133 mhz. Do I need to change the voltage manually as well? I also tried with 2400mhz btw and the red light goes on
 
Jul 11, 2018
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I'll check that.
The voltage displayed is 1.35v with xmp but when I set the memory at 2666mhz the voltage stays in 1.20v
 
Jul 11, 2018
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I haven't since I don't have a gpu installed, I'm just using my pc to program and to navigate until my gpu arrives home. I'll contact Gygabyte. Thank you so much! You helped a lot.