Noise in audio output

I both Fatal1ty FM2A88X+ Killer and when i try to connect the audio out to the amplifier and speakers , i have several noise in the audio , I changed the main board with the supplier, updated the bios, changed the power supply, CPU and amplifier are in the same power strip with ground ,,, in the same conditions if i use my lap top there is no noise ???

The main reason for buying this  Fatal1ty FM2A88X+ Killer was the information that the audio was of high quality ??
What i can do ?

orlando.luccio wrote: I both Fatal1ty FM2A88X+ Killer and when i try to connect the audio out to the amplifier and speakers , i have several noise in the audio , I changed the main board with the supplier, updated the bios, changed the power supply, CPU and amplifier are in the same power strip with ground ,,, in the same conditions if i use my lap top there is no noise ??? The main reason for buying this  Fatal1ty FM2A88X+ Killer was the information that the audio was of high quality ?? What i can do ?

The board's audio components may be of high quality (they are of high quality) but that does not guarantee that other parts of the PC are not adding noise into the audio signal.

The audio parts on the mother board are isolated from other parts on the mother board, to prevent noise from the other parts being picked up by audio parts. That does not mean that sources of noise that are not on the mother board itself have their noise isolated from the audio parts.

There are many parts in an audio signal path. The audio signal source, digital to analog convertor (DAC), preamplifier, amplifier, and speakers. A mother board provides the digital to analog convertor and preamplifier. We provide the audio source, amplifier, and speakers.

What is your audio signal source in that PC? What format or type of files do you use? Or streaming audio over the Internet?

Most PC have multiple DACs and preamplifiers for audio. If your CPU has integrated video, it also has those audio parts. If you use a video card, it has those audio parts.

You must select the default DAC and preamplifier in Windows. If you don't select the Realtek audio, then one of the other DACs and preamplifiers will be the default. That signal may even be routed through the Realtek audio parts, which only makes the signal worse.

You may have replaced the PSU, but is it the same model? What PSU are you using? Do you have power cables from the PSU near the audio parts on the board? Or power cables near the audio signal source device? wardog said the same thing in his post above, because it is matters.

Do you have the AMD CPU power saving feature Cool n Quiet enabled in the BIOS? If you do, set it to disabled and check if the audio noise is better.

Did you disable Spread Spectrum in the BIOS?

Comparing your laptop to the desktop PC is comparing two completely different types of hardware. The PSU of the laptop is no where near it, and uses a battery to provide the power. So you use the same audio signal source in the laptop and desktop PC?

Everything you use might be connected to the same power strip and ground, but have you verified that the AC wall outlet is wired correctly, and has its ground connected?

You have not told us what the noise you hear is. Is it hum, hiss, crackling sound, some or all of these together? Does it change with the volume level?