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I have made every common PC building mistake so you do not have to
They say experience is the best teacher, but when it comes to PC building, experience can be expensive. I’ve fried boards, blocked PCIe slots, and skimped out on cheap parts that would end up killing entire rigs. It’s funny now, but it wasn’t then. If you’re new to PC building, consider this your warning label: learn from my mistakes before you make them yourself.
Cheaping out on a PSU
The results were disasterous
When I had just begun to learn about PCs and their components, I really wasn't familiar with power supplies. As a naive teenager, I assumed the thing that took the power from the wall and supplied it to the rest of my computer was relatively unimportant beyond having one that just functioned. If it didn't increase my FPS, I didn't care about it.
When parting out and building a system for a friend, I had purchased a cheap Rosewill power supply to power the rest of his Ryzen 1000 system. It was devoid of reviews at the time, but it was on sale, and fit the wattage we needed. It was even 80 Plus certified, which has to count for something, right?
The build came together without a hitch, but many weeks later, that power supply kicked the bucket unexpectedly, and took a bunch of parts in the system to the grave with it. The RAM and GPU were spared, but the motherboard, CPU, and even storage were all rendered non-functioning after the failure. After successfully RMAing the parts that had failed, we went with an EVGA unit this time, and that same power supply is still running today.
Failing to check physical compatibility
It can sneak up on you
Physical compatibility is a pitfall I've fallen into multiple times. It happened as recently as just this past year, when putting together a new workstation. Physical dimensions are quite easy to check with popular parts on websites like PCPartPicker, but when it comes to stuff that's even a little bit niche, you can start to run into some problems.
I was putting together a system with the Noctua NH-D15 G2, which is a relatively new revision of their wildly popular NH-D15. I knew it'd be compatible with the AM5 socket I was building, and didn't feel the need to double-check compatibility with the Gigabyte motherboard I had purchased. Imagine my shock and immense disappointment when I discovered more than halfway through the build that the cooler completely obstructed the top PCIe slot. Triple-check your physical compatibility, folks.
Improper thermal paste application
The fix is simple
Thermal paste was one of the most hotly debated PC hardware topics in the 2010s, and there's no good reason for it. If you put enough on, you're generally fine. I've never actually applied too little thermal paste on accident, nor on purpose, and even though the experiment has been run thousands of times, I did it anyway to see what would happen, and the results weren't surprising.
With a very small, half-pea-sized amount on my 7800X3D, core temps jumped almost 15 whole degrees Celcius. While playing Battlefield 6, my temperatures normally hover around 70 degrees with an adequate amount of thermal compound, but with the pitifully small amount, they were in the 85+ range quite often, with hotspots reaching uncomfortable levels. The solution here is so simple: just use enough thermal paste. Especially on these X3D integrated heat spreaders, spreading the paste around to get full coverage is pretty essential to ensuring good thermal transfer between it and the cold-plate of your cooler.
Forgetting standoffs
A brutal lesson learned early
One of the toughest PC hardware lessons I learned just happened to be one of the first. I had wanted to transplant my hand-me-down Pentium 4 PC into a different case, as the one it was currently in was completely obstructed for air and had case fans with noise that rivaled an active construction site. I bought a case second-hand off of a family friend, and I screwed the motherboard straight into the case,
I was blissfully unaware that there was something that had to go between the motherboard and my case to prevent a short. Upon plugging everything in and turning the system on, the smell of magic smoke was an indicator that I had made a grave error. Thankfully, these days, standoffs are often installed out of the box, so there's very little chance of anyone making this mistake with modern cases.
These are mistakes I'll never make again
Every PC builder has a story about the one that went wrong, and I’ve got several. If there’s a common mistake to make, I’ve probably made it. These are the kinds of errors that you really only make once, and they're a sort of rite of passage for PC enthusiasts.
