Help with silent PC build

few things to start with. look for a digital power supply one that you can change the fan ramp on it and one that will only come on when needed. then for the case fans get the most slient ones at max speed. then connect them to a fan controller. 120mm fans running at full speed gets loud. in the case have a large 200-300mm if there is one or use a fan bracket or make sure there air cold going from them bottom going over the gpu and cpu. moving air in the case will keep both parts cool and there fans from maxing out.

Liquid cooling is much quieter. However, most of your noise is likely coming from the GPU.

To keep temps down, make sure you have decent airflow in your case. And you want to use and find quite fans. Noctua make great high airflow quiet fans. Along with many other brands. The quite fans use much quieter bearings for operation, and they can be more expensive because of this.

Keeping fans quite, and keeping temps in line is very much dependent on how good the airflow in your case is.

You want cool air to enter the front/Top/Bottom of the case, and ideally leave the back with a more Positive pressure setup (meaning you have more intake fans than exhaust fans). The reason you want positive pressure, is it keeps dust out of your system if you can have your intakes sitting behind dust filters. Positive pressure configurations will actually push some air out of all the gaps in the case essentially blowing dust away from accumulating in those spaces. A negative pressure build (more exhaust fans than intakes) actually will create a vacuum and bring in dust through all the gaps in the case, and tends to be very inefficient.

A cool way to test the airflow quality of your case is to try and get something that creates some smoke (like a bundle of incense and move the bundle around the outside of the case to see where the intakes and exhausts are. You can check the gaps of your case this way too to ensure you have a slight positive pressure setup (Smoke should be gently blown away from all gaps in the case, not sucked in) If you can create enough smoke, you can even look and see the path of airflow within the case if you have a window. This will show you where the airflow is going through your case. Often, the GPU is getting very little airflow and tends to got hotter because of it. You can adjust some fans and even some fan speeds to better direct airflow over all components.

Once you have good airflow in your case, your components should cool down a bit under load. Once that happens, you can add some sound dampening foam to the case to quiet things down more. You will want to ensure you have good airflow before doing that though to prevent overheating components.

Those are awesome fans, but those are also 140mm fans. Slightly bigger than what some cases use. I would check up on the case documentation to see where 140mm fans can be used. The most common fan sizes are 140mm and 120mm. Smaller, more compact cases tend to use more 120mm fans.

Both those cases are good cases. THey both server a different market. The R5 does not have a window, and is designed with a more quiet operation in mind. To some, if they want to show off the build or parts, the case is boring though.

The H440 is one of my favorite cases on the market. Looks really good when built up well with good cable management, and offers lots of good airflow in its design. So if you don't care about showing off your parts, go for the R5. Otherwise you can make the H440 be a very good case for you as well.