Could it be that I am powering it using a Molex to 3pin converted connected to a 4pin slot in the power supply unit?
??? That can't be possible, now, can it? Can you please pass on a picture of how you have the sound card connected to your power supply?
Have you tried with a BIOS update for your system while you go into reinstalling the audio drivers on your system? Speaking of system, can you please pass on your full system's specs? Unfortunately the drivers for your sound card are classified as being under beta
. You'd need to downgrade to Windows 7 or go up to Windows 10 per drivers available.