Thanks for the reply 
And sorry what I meant by “integrated audio processor” was integrated motherboard onboard audio processors
My PCIe soundcard does have an Optical S/PDIF Out
jack! I know it would be advisable to get a DAC which takes Optical S/PDIF In but I want to assume that comes to a bigger cost.
So I guess the Schiit MAGNI 3 Heresy wouldn’t be suitable if I want the best result with my current setup