Upgrade for PC or Nvidia shield, looking for recommendations
I have a question, I have Denon 2300 + Old PC which I used to play 4k Movies (AMD Athlon II X4 640, GTX 660 (if I remember well), Gigabyte GA-MA770T-UD3P,1 TB: Samsung F3 HD103SJ - an old PC basically). I noticed that more and more often it did not handle with 4k movies, in that case, I just plug in my HDD usb3 drive through the 4k USB port in front Denon and play the movie (75% without issues, maybe I had one or two problems with films. I'm looking for the best quality sound and picture with the cheapest option. Do you think that I should upgrade the pc? I have nice new-looking housing for pc, some of the voices were saying that I should just plug in the HDD to Nvidia (buy first) and enjoy the well working device. Do you think that just playing in the HDD to Denon I lose some quality? (60" Samsung 4K, Denon AVR-X2300, Klipsch 7.1.2 (atmos -I would like to keep it, I'm not sure if Nvidia has atmos).
If you would recommend new pc what will be the minimum that allowed me to enjoy full 4k films (films which weight is around 40GB).