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5 fake CPU bottlenecks I learned to fix for free in 20 years of PC building
Desktop PCs are super upgradeable—that's one of their biggest perks. But if there's one upgrade that feels like a chore and actually is a chore, it's the processor.
Swapping out your CPU usually means doing the same with the motherboard, and that can pull along a host of different upgrades. Before you know it, you've spent a few hundred dollars.
However, as a PC builder of 20 years, I'm here to tell you that you probably don't need a new CPU. At the very least, check out these common bottlenecks before buying a new processor.
A CPU bottleneck isn't always a CPU problem
It's funny how that works, right?
The CPU is often the first part to catch some flak when something goes wrong in your PC. It's either that or the GPU, and just like many people believe that graphics cards age poorly, many are quick to jump on the "CPU bottleneck" bandwagon.
And sure, if there's something wrong with your CPU, you can bet that the entire PC will feel it, and soon. But more often than not, it's just the CPU reacting to a problem somewhere else.
A lot of these problems don't show up as obvious failures, either (thankfully). It's not like your entire PC goes up in flames. Apps still launch, frame rates in games may look alright, and Task Manager may look fine. But if your PC is choppy, inconsistent, underperforming, or, worst of all, crashing, it's easy to blame the CPU. However, the CPU may not even be the culprit.
That's why CPU troubleshooting needs to be broad. Looking at the big picture, including memory, storage, and temperatures, should be the first step here.
5 fake bottlenecks that may seem like a CPU problem
The usual suspects, now with receipts
Before you start blaming your CPU, do some thorough troubleshooting. It can save you some major time and money. Here are the most common culprits that might look like a CPU bottleneck at a glance, but are, in fact, fixable for free (or cheap).
1. Single-channel RAM is starving your CPU
A lot of people don't think much about their RAM layout, but if you're using single-channel RAM, meaning just one stick instead of two, that can explain some performance issues. Using just one stick or putting two sticks in the wrong slots can really hinder PC performance, as the PC won't be getting data as efficiently as it should. This hurts frame pacing, minimum frames per second (fps), and overall responsiveness.
The fix here is pretty simple, although expensive in the current RAM-pocalyptic climate: Install two matching sticks in the correct dual-channel slots listed in your motherboard manual.
2. XMP or EXPO is off, so your RAM is super slow
Your RAM may be fast out of the box, but run at a fraction of the advertised speed in your PC. That's because RAM manufacturers advertise the speeds when XMP or EXPO profiles are enabled, and your RAM may not have this enabled right out of the box.
Another easy fix here. Go into your BIOS and enable XMP or EXPO so that your RAM runs at its rated speed. This is technically overclocking, so tweak as needed if you run into stability issues.
3. Background junk is chewing through frametime
Your CPU carries a heavy burden every single day. It's dealing with your games, apps, launchers, RGB software, updates, browsers, scans, and whatever else is going on in the operating system. None of that is enough to tank performance on its own, but stack up too much at once and you may be wondering about CPU bottlenecks.
Well, before you think about bottlenecks, think about disabling unnecessary startup apps. Close background software and dig through the Task Manager for processes that don't need to be there. You may win back quite a bit of performance.
4. Storage stalls make your games feel CPU-bound
Filling your SSD to 100% is never a good idea, and the more your storage approaches that threshold, the more performance will suffer. Games may hitch while loading in new areas, apps may pause and take ages to load, daily tasks may feel slow ... and it might not be your CPU.
There are a few ways to fix this, from creating an abuse drive for the random junk and letting your main SSD take center stage, to simply deleting some unnecessary files.
5. Thermal throttling is slowing down your entire PC
If your CPU is choking on dust 24/7, it's never going to offer the performance it was meant to deliver. Thermal throttling is very much a thing, and just because the computer doesn't crash doesn't mean it's not suffering from it.
The fix costs exactly zero dollars: just clean your PC regularly. If that doesn't help temps, you might need to overhaul the whole cooling setup, which is still cheaper and easier than a CPU + mobo upgrade.
Save your CPU upgrades for last
If you can avoid it, it's often for the best
Upgrading an aging CPU is a huge bother. Processors themselves can be bought on the cheap these days, but the best variants like the 9800X3D and up still cost a pretty penny. Even if you aim for the mid-to-low-range, you'll have to factor in around $100 or more for a motherboard, and that might only be the beginning.
If you can avoid it with any of the above fixes, that's a lot of hassle avoided.
A CPU can be a massively meaningful upgrade, under the right circumstances
I've seen the power of a new CPU in an aging PC firsthand, so I'm not trying to tell you never to upgrade your CPU. If the processor is years old and has clearly fallen behind the rest of your platform, it might be time to spend that money, spend that time, and get that upgrade.
Go over the list above first and try to avoid the upgrade, but if it's not possible, the good news is that now is a strangely good time to buy a CPU. While GPU or RAM upgrades are still a nightmare, processors are still semi-affordable.
