Have this Crack + Speedball https://i.imgur.com/uWnxhp1.jpg

My new rig's motherboard is this with the SupremeFX onboard DAC/AMP https://www.asus.com/nz/Motherboards/Z170-PRO-GAMING/

Hoping someone can dumb this down for me because I am reluctant to sell the amp. Basically here's the summary, and keep in mind I am using the same 980 Ti Strix graphics cards for both old and new PC. I changed everything else:

• On my old PC, I was not getting any interference from the old mobo lineout to my Bottlehead Crack
• There is also no interference via my Asus Essence STX on old PC to my Bottlehead Crack
• I just recently changed to a new rig, and I am getting buzzing/hissing interference. Pretty sure its from my PC, as everytime i move my mouse / high CPU or GPU activity -- I get the interference. Seems like it's coming from the PSU / GPU coil whine. I am running the Crack directly to the PC motherboard lineout
• Plugged my HD650 directly to my new PC lineout (green coded), and not getting interference
• Plugged my mobile phone directly to the bottlehead crack -- no interference

Unfortunately, I do not have many equipment to test with, but luckily:

 

1. Someone will be lending me his external USB ODAC; I really hope this resolves the issue
2. He will also lend me a Ground Loop Isolator which he 99% believes should resolve my issue