Dont overdo thermal paste
It’s a silly little step, but it’s something people constantly argue about online: what’s the best way to apply thermal paste? I’ve seen people do some pretty crazy things, like put on a giant blob or spread it around with a credit card, when it really couldn’t be simpler. Just put a small, pea-sized dab in the middle (lentil-sized, really), or a thin line about the size of a grain of rice. Then put your heatsink on and start screwing it in. The pressure will spread it out for you.
There are always exceptions to this rule, like very high- or low-viscosity pastes (like ones made with actual silver). But for the average paste, the process really is this simple. If ever in doubt, just check the instructions that come with your paste or look at the manufacturer’s web site. In fact, their web site should also tell you which method (pea or rice) is best for your specific brand.
plan before you build
Every build is different, and jumping in too quickly might mean you forget something important and end up having to take it apart and start from scratch. So, take a step back for just a few moments and plan your build out. Does your CPU cooler have a backplate? Attach it to your motherboard before you screw your motherboard into the case. Is your graphics card large? Install your hard drives first, since it’ll probably block access to them. Does your power supply hinder access to your motherboard? You’ll want to install it afterward, instead of before (though sometimes the reverse is true). It sounds silly, but a little visualization can make things a lot easier and less time consuming.
Add Max Fan
I don’t need to tell you that a hot, dusty computer is bad—but a lot of builders don’t put too much thought into their fans the first time around. Pay attention to which directions your fans are facing (they should have an arrow on the side that tells you which way it blows air), and try to get the air flowing all in one direction—usually in the front of the case, and out the back. You also probably want more intake fans than exhaust fans to create positive air pressure inside your case. If you have more intake pressure, then any extra air will escape through the nooks and crannies of your case, as opposed to entering through those nooks and crannies (and thus bringing in more dust). Positive air pressure coupled with filters on your intake fans means you’ll have much less dust, which means cooler and quieter operation. Check some good Fans On Amazon