All standard computers make a lot of noise with background noise from programs ,fans a dedicated streamer is far better , I too have a computer but there are ways around this to some extent for example Ethernet switch I bought a decent one a SW8 with linear power supplies for around $600
then gojng into your computer to clean incoming noise ,and btw I have a 12v 8 amp LPS power supply to my router ,
after the router if your dac has a I2S input clean all that noise before the dac with a Denafrips Iris, or stinger DDC then your signal is pretty clean , if you want
a clean audio signal.and make sure your Ethernet cables and usb cables are not cheap ,being a audiophile cost $$ no getting around it .