There's a lot that goes into building a good gaming PC, but it all starts with the right parts. Choosing a collection of components that are compatible, grants you the performance you wish, and that can be easily upgraded in the future, is no simple matter. I've built countless gaming PCs for friends and family, and as a result, I've had to part out systems for a variety of different budgets and needs. Through all this experience, I've learned that these 5 pitfalls are the easiest to fall victim to when selecting parts.

5 Worrying about CPU and GPU performance mismatch

It's not always a bad thing

One piece of PC building advice that's thrown around a lot is "make sure you choose a CPU and GPU that are similar in performance," which isn't totally untrue. You do want to make sure that you're not totally choking off a beefy GPU with an under-powered CPU (or vice versa), but worrying too much about this can actually land you in a worse spot overall with your build, especially if you've already purchased a few of your parts.

Gaming PCs are almost always a work-in-progress, at least, that's how I see them. For instance, if I enjoy playing CPU-bound titles at 1080p, and I'm currently rocking an older Core i7 or Ryzen 7 CPU, paired with an RTX 3070, the next logical upgrade for me would be jumping to a more modern CPU platform. The result of this upgrade will definitely be an "unbalanced" build, but that 3070 will still be fine in the games you enjoy playing, at least for the foreseeable future.

Even if you're planning on a brand-new build, if you know you want the Ryzen 7 9800X3D, but can't afford a GPU to take full advantage of that CPU, throwing in a used RX 6000 or RTX 30-series card might be the move until you can afford to upgrade to something better. As long as you plan to upgrade, there's nothing wrong with a little mismatch.

4 Overlooking compatibility

There are more considerations to take than you might realize

Compatibility manages to trip up even the most experienced builders, and it's important to ensure compatibility between all parts of your system before purchasing. This goes beyond just making sure your CPU is the correct socket for your motherboard—checking dimensions for clearances and mounting points are super important.

During a recent PC build for a friend, I recommended them a series of parts, and while they kept the other components the same, they decided to grab a different motherboard that was on sale. No big deal, they chose the same chipset, and it had all the same features they wanted. Little did either of us know, the motherboard he chose wasn't actually compatible with the CPU air cooler I had recommended. The cooler actually hung over the first PCI slot, making a GPU installation impossible. Sure enough, on noctua's website, they clearly state that this cooler isn't compatible with this board. Lesson learned: always double check compatibility!

3 Skimping on initial storage

Get the fast stuff, and get a lot of it

There's nothing worse than running out of storage. It might be tempting to compromise on storage space or speed initially, since it's an easy upgrade later, but you really should avoid it. Getting the biggest, fastest boot drive possible should be a priority. Storage space fills up quickly, and one theme I've noticed among the PC builds I've done for friends is that even a 1 TB NVMe boot SSD can not be enough sometimes. Skimping on speed is also not recommended, but instead of obsessing over transfer rates and random read speeds, find one that has a DRAM cache, and you should be fine.

It does depend on the person, of course, but I think anything under 1 TB just isn't enough in 2025. Lower-capacity drives do have uses, but after installing Windows, your applications, and a couple of games, a 500 GB drive can fill up really quickly. The price delta between a 1TB and 500 GB drive is also quite small, depending on model, of course. Long story short: get the biggest boot drive you can, and make sure it has a DRAM cache.

2 Neglecting airflow

Not all cases are created equal

Airflow can be the difference between your components performing within spec, and not performing at all. Overheating can cause heavy performance loss, but also complete system shutdown, if the situation is dire enough. Most PC cases ensure enough air can get to your important components, but some aren't thought out all that well. It's hard to tell among all the marketing jargon, but you want to look for a case with an intake that has a decently high porosity, in addition to some kind of exhaust fan (in most cases).

Not all cases come with fans to fill every slot, but you also don't need to fill all of them to get decent airflow across your components. In a conventional ATX build, 2 intake fans and one exhaust fan create a positive pressure setup, which is what most people should aim for. If your case is unconventional, consult the manufacturer's guidance for setup.

1 Failing to consider upgrade paths

The worst gaming PC sin

It's easy to build yourself into a dead-end with a gaming PC, especially if you don't keep up with the current state of affairs in the hardware industry. Manufacturers don't do a great job at conveying which products are from the same family, but even products within the same group might not be eligible for direct upgrades from one another.

For example, right now, I really won't bother buying a new Arrow Lake CPU at the moment. Intel made it very clear that their upcoming CPUs will not be using the LGA 1851 socket that the Core Ultra 200 series uses, and instead will use an LGA 1954 socket. This eliminates any kind of direct upgrade path within-socket for Core Ultra 200 buyers.

Don't get in your own way

PC building can be an extremely rewarding experience, but it's also easy to fall victim to common mistakes. Even the most seasoned veterans in PC building still get tripped up occasionally. Selecting parts is one of the trickiest parts of the process, and shouldn't be done hastily.