Thank you for your replies mga sir's, Iam just very curious, I have an HP notebook that I use for foobar 2k and spotify to play music via USB going thru my DAC. I am pretty satisfied already by the sound it produces. But curiosity kicked in, I tried a newer HP laptop with I7 processor which I use for office duties and there is a significant difference on SQ, giving a clearer presentation onf music, blacker backgrounds, better separation of instruments etc. so I was thinking if a better PC with separate fanless power supply would give a better SQ compared to a laptop. Is there someone here who have tried a PC with ultra linear power supply? I have read that it gives a better SQ than PC's with ATx smps power supply.