Processors are one of the most important parts of any computer, but they’re also among the easiest to take for granted. They’ve been improving so steadily over the years that it’s easy to lose track of just how far things have come, and how outdated some older chips really are when viewed in a modern context.
Processors that once felt fast and capable can quickly become a bottleneck in a modern system, and it sometimes takes a modern workload or simply trying a newer machine for that gap to become obvious. With that in mind, here are a few processors that had remarkably long and successful runs, but whose time has now come to an end.
The Intel Core 2 Quad Q6600 had a good run, but it’s long overdue for a retirement
A legendary CPU that’s been showing its age for a while
The Intel Core 2 Quad Q6600 was released all the way back in 2007. The CPU was a massive hit for mass-market desktop PCs, as it finally offered an affordable entry point for 4-core CPUs in an era when many people still ran single-core Pentium 4 systems. And since it launched right around the same time as DDR3 RAM, you could pick between DDR2 and DDR3 depending on which motherboard you chose.
To this day, the Intel Core 2 Quad Q6600 (and the Core 2 Duo & Quad generation as a whole) remains one of the most fondly remembered CPUs by those who used it and have hopefully upgraded since. It’s especially near and dear to my heart, as it remains the CPU I ran the longest in my personal machine for seven full years, only to replace it with a 2nd-gen Ryzen chip in 2018.
As good as the processor was at launch, it can’t beat time—after all, it’s almost two decades old at this point.
Aside from being incredibly slow and inefficient by modern standards due to its outdated 65 nm process node and ancient microarchitecture, one of the Q6600’s most fatal flaws is its lack of the POPCNT instruction. Microsoft made this instruction a mandatory requirement for the Windows 11 kernel starting with version 24H2.
Because Intel only introduced support for the SSE4.2 instruction set (which includes POPCNT) in 2008, the Q6600 is permanently locked out of modern Windows—and if we’re being honest, its raw performance in modern applications makes it a hard pass for Linux users too.
The AMD Phenom II X6 1090T was a beast at launch, but it’s little more than a paperweight today
Even having more cores than the competition couldn’t save it
When the AMD Phenom II X6 1090T launched in 2010, it was one of AMD’s best desktop CPUs at the time. The CPU had six cores and was based on the Thuban architecture and the 45nm process, so it’s easy to see why it performs leaps and bounds better than the previous entry on this list.
The 1090T was often compared to the Intel Core i7-870, which had 4 cores and supported hyper-threading for a total of 8 threads vs. the 1090T’s six physical cores and six threads.
Although the Intel chip typically had better performance in games, it was also nearly twice as expensive, making the 1090T the optimal value pick, especially for work. To top it all off, the 1090T was unlocked, meaning you could push the clock speeds even higher—but you had to keep an eye on that already incredibly hot 125W TDP.
Unfortunately, even the 1090T isn’t immune to time. Beyond its performance being eclipsed by even the cheapest modern budget chips, the 1090T lacks support for AVX (Advanced Vector Extensions). AVX has become a common requirement for modern applications, games, and even basic productivity tools, so the 1090T will crash when it encounters modern code.
Also, although it’s a bit newer than the Intel Core 2 Quad Q6600, the AMD Phenom II X6 1090T still lacks POPCNT, which means it can’t run the Windows 11 kernel even if all other system requirements are met.
When you combine all these factors with a dead-end AM3 platform, it’s clear that this former value king has become a liability.
5 CPUs that are officially too old for gaming in 2026
Stop gaming on these 5 CPUs—they’re holding you back more than you think
The Intel Core i7-2600K is still a decent chip, but only on Linux, and if you’re fine with high power bills
Surprisingly capable, but not without compromises
Despite launching all the way back in 2011, the Intel Core i7-2600K has aged far better than both the Q6600 and 1090T. Its Sandy Bridge architecture and 32nm process node are leaps and bounds ahead of anything that AMD had to offer at the time.
In fact, the i7-2600K was one of the most influential desktop CPUs ever released, and its strong single-core performance means it’s still usable. It can even handle some light gaming today, especially after an overclock.
That said, “still usable” isn’t necessarily the same as “still worth using.” While the i7-2600K supports AVX and can even be made to run Windows 11 with some workarounds, its lack of AVX2 support means that it’s not the best choice for new and upcoming programs and games.
The bigger issue is that modern CPUs have simply moved too far ahead. Even an inexpensive processor that you can buy for under $150 can outperform the i7-2600K by a wide margin while using considerably less power.
Once you factor in the aging LGA 1155 platform, slow DDR3 memory, and the lack of an upgrade path, it becomes difficult to justify keeping the 2600K in your primary PC. Frankly speaking, the only scenario where this CPU could still make sense is in a Linux-based gaming PC that you only turn on for a few hours a week to do some light or retro gaming.
If you’re still on the 1st-generation AMD Ryzen chips, it’s time for a cheap (and substantial) upgrade
One of the easiest performance upgrades you can make on an old platform
While most CPUs on this list are truly ancient, that’s not necessarily the case with the first generation of AMD Ryzen processors. The Ryzen 1000 series launched in 2017, so as far as feature support is concerned, it’s still a relatively modern family of CPUs.
The real “problem” with the Ryzen 1000 series is that it uses the AM4 platform—the same one that AMD has continued to support for years after it was supposed to be replaced by the newer AM5.
The Ryzen 7 5800X3D 10th Anniversary Edition, which was announced at Computex just recently, perfectly encapsulates this. Thanks to its fast raw processing power and 3D V-cache, it’s still an incredibly powerful pick among gamers who are still on the AM4 platform.
If you happen to have an AM4-based system and are still rocking one of those first-generation Ryzen chips, it makes little sense not to upgrade.
The AMD Ryzen 5 5600 can be found new for around $150, while its somewhat anemic Ryzen 5 5500 counterpart, which lacks PCIe 4.0 support, is readily available for under $100. These CPUs are leaps and bounds faster than the Ryzen 1000 series in gaming, productivity applications, and general everyday use.
Old processors can still find a second life
Although these CPUs are far too old for a modern machine that you use for work, gaming, or both, that doesn’t mean they’re complete junk that should be thrown away. While some of them can no longer run a modern version of Windows, you can always install a lightweight Linux distro and put these aging CPUs to work in other ways.
Turn one into a dedicated retro gaming machine, build a nostalgia-filled desktop for older software, or repurpose it as a headless server or NAS in your homelab.
I built my first homelab from secondhand gear, and it taught me more than a new NAS ever could
Everyone thinks they need an expensive NAS to start a homelab (they’re wrong)






