The Core i9-12900KS briefly topped Tom’s Hardware’s launch gaming charts, but its lead over the regular Core i9-12900K was small: 2.7% on average in CPU-focused 1080p testing. Intel asked $739 at launch—about 25% more than the 12900K’s $589 recommended price—for that modest gain, while the KS drew more power and demanded serious cooling. Intel now lists the boxed processor as retired and discontinued, so in 2026 it is chiefly an option for a discounted LGA1700 upgrade, not a default choice for a new gaming PC.
What is the Core i9-12900KS?
Launched on April 5, 2022, the Core i9-12900KS is a Special Edition, unlocked Alder Lake desktop processor. It is essentially a higher-clocked, better-binned version of the Core i9-12900K, not a new architecture. Intel’s specifications list 8 Performance-cores and 8 Efficient-cores, for 16 cores and 24 threads, built on Intel 7 and installed in an LGA1700 motherboard.
| Specification | Core i9-12900KS |
|---|---|
| Core configuration | 8 P-cores + 8 E-cores |
| Total cores / threads | 16 / 24 |
| Maximum turbo frequency | 5.5 GHz peak opportunistic boost, not an all-core clock |
| Cache | 30 MB Intel Smart Cache |
| Socket | LGA1700 |
| Memory support | DDR4-3200 or DDR5-4800, depending on motherboard |
| Processor graphics | Intel UHD Graphics 770 |
| Processor Base Power / Maximum Turbo Power | 150 W / 241 W |
| Processor features | PCIe 5.0, Intel Thermal Velocity Boost, Turbo Boost Max 3.0 |
Those figures are Intel’s published specifications. The 5.5 GHz maximum is a peak boost under suitable conditions, not a promise that every core will run at that speed. Actual clocks depend on workload, temperature, power limits, cooling, silicon, and motherboard behavior. See Intel’s specifications.
What does the KS add over the 12900K?
The KS keeps the 12900K’s core count, thread count, cache, and platform. Its main change is higher stock frequencies, alongside a higher Processor Base Power rating. In Tom’s Hardware’s comparison, both chips have a 241 W Maximum Turbo Power rating.
Free tools Windows power users keep installed
One-click scans. No signup required.
#1 Best Overall
- 【Processor】 Powered by the Intel Core i9-12900K processor, this system features 16 cores and 24 threads to handle demanding applications and complex multitasking. It includes 30MB of Intel Smart Cache and 14MB of L2 cache, operates at a 3.2 GHz base frequency, and can reach up to 5.2 GHz with Intel Turbo Boost Max Technology 3.0—enabling responsive performance for content creation, data analysis, gaming, and professional-grade productivity.
- 【RAM and Storage】 Supports configurations of up to 64GB of DDR5 RAM for efficient multitasking across memory-intensive applications and browser tabs. Storage options include up to 4TB of PCIe M.2 SSD, offering faster boot times, improved file access speeds, and ample space for projects, media libraries, and software installations.
- 【Operating System】 Comes with Windows 11 Home (64-bit, English) pre-installed, providing a familiar and secure interface with built-in productivity features and regular updates for a reliable out-of-the-box experience.
- 【Keyboard and Mouse】 Includes a Lenovo Black Wired Keyboard and Mouse set for dependable, plug-and-play input. The wired connection offers consistent responsiveness for daily computing tasks in work or home environments.
- 【Tech Specs】 Offers a practical range of connectivity options: 7x USB ports for peripherals, dual-monitor support via HDMI and VGA for expanded display setups, Wi-Fi 6 and Bluetooth 5.2 for capable wireless performance, and Gigabit Ethernet (RJ-45) for stable wired network access.
| Specification | Core i9-12900K | Core i9-12900KS |
|---|---|---|
| P-core base frequency | 3.2 GHz | 3.4 GHz |
| Maximum turbo frequency | 5.2 GHz | 5.5 GHz |
| E-core base frequency | 2.4 GHz | 2.5 GHz |
| E-core maximum turbo | 3.9 GHz | 4.0 GHz |
| Processor Base Power | 125 W | 150 W |
| Maximum Turbo Power | 241 W | 241 W |
| Cores / threads | 16 / 24 | 16 / 24 |
| L3 cache | 30 MB | 30 MB |
That makes the regular 12900K the more rational choice for many LGA1700 buyers: the KS does not add cores or cache, and its gaming uplift was small relative to its launch premium. An enthusiast who enjoys tuning can also consider whether a 12900K offers better value than paying extra for the KS’s factory clocks.
Was it really the fastest gaming CPU?
At launch: first in one prominent test suite
In its April 5, 2022 review, Tom’s Hardware ranked the 12900KS first for cumulative 1080p gaming performance, using an Nvidia GeForce RTX 3090 in CPU-focused testing. It measured a 2.7% average gaming advantage over the 12900K and a 6.9% advantage in 99th-percentile frame rates. Those are results from that review’s suite and conditions, not a guarantee for every game or PC. The gap became much less meaningful at QHD, where the graphics card takes a larger share of the workload. Read the Tom’s Hardware review and test details.
The 5800X3D made the timing complicated
AMD’s Ryzen 7 5800X3D was scheduled to arrive later in April 2022, after the KS launch. Its 96 MB of L3 cache made it a serious gaming challenger, so a pre-launch comparison could not settle the longer-term contest. AnandTech’s 12900KS review provides additional launch-era architectural, thermal, and productivity context.
Rank #2
- Get ultra-efficient with Intel Core Ultra desktop processors that improve both performance and efficiency so your PC can run cooler, quieter, and quicker.
- Core and Threads 24 cores (8 P-cores plus 16 E-cores) and 24 threads. Integrated Intel Graphics included
- Performance Hybrid Architecture Integrates two core microarchitectures, prioritizing and distributing workloads to optimize performance
- Performance Unlocked Up to 5.7 GHz unlocked. 40MB Cache
- Compatibility Compatible with Intel 800 series chipset-based motherboards
“Fastest” is always conditional: game engine, resolution, graphics settings, GPU, memory configuration, BIOS, power limits, background activity, and whether a review emphasizes average frame rate or low-percentile performance can change the outcome. A CPU-limited 1080p result is useful for exposing processor differences; it does not predict the same percentage gain at 1440p or 4K.
How did it perform outside gaming?
The extra clocks can help lightly threaded tasks and some heavily threaded workloads, but the benefit depends on the application and is not automatically proportional to the KS price premium. The 12900KS has 24 threads; AMD’s Ryzen 9 5950X has 16 cores and 32 threads, an advantage in some highly parallel workloads. The KS’s elevated power and heat are important parts of the trade-off, not incidental details. AnandTech characterized it as both the best of Alder Lake and among its hottest parts.
Memory can change the comparison
The 12900KS supports either DDR4 or DDR5, but the motherboard determines which memory type you can use; one board cannot switch between them. DDR4 can reduce the cost of an existing-platform upgrade, while DDR5 can improve performance in some games and applications. Frequency alone is not the whole story: timings, latency, gear mode, capacity, and the particular game or workload matter.
Rank #3
- 12 Gen Intel CPU
- Base frequency: 2.4 GHz
- LGA1700 Socket
- PCIe 5.0 and 4.0 support
- Processor base power: 125 W
In TechSpot’s testing, moving the 12900K from DDR4-3200 to DDR5-6400 improved gaming performance by about 8%, while the 12900KS was about 1% faster in that particular comparison. That result is not universal, but it shows why comparisons that mix memory configurations can mislead. See TechSpot’s testing and methodology.
Cooling, power, and overclocking
Intel rates the KS at 150 W Processor Base Power and 241 W Maximum Turbo Power. Its Adaptive Boost Technology can push sustained workloads aggressively within the chip’s power and temperature limits. Tom’s Hardware observed a substantial thermal load and boost behavior that pressed the cooler while staying below the 105 °C throttle point in its test setup. That is not a universal temperature prediction: cooling hardware, room temperature, contact, board settings, and workload all affect results.
Outdated Drivers Are Slowing You Down
One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchPC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11- Plan on a top-tier dual-tower air cooler or a good 280 mm or 360 mm liquid cooler for sustained high performance.
- Check case airflow, radiator clearance, motherboard power delivery, and BIOS power behavior; a basic 120 mm tower cooler should not be assumed to sustain peak performance.
- Distinguish Intel’s published power ratings from motherboard defaults that may relax or remove limits.
- The chip is unlocked, but it already uses aggressive factory boost behavior. Manual overclocking may add little gaming performance; undervolting or setting sensible power limits may offer a better heat, noise, and performance balance.
Silicon quality varies, so no overclock or undervolt result is guaranteed. Treat second-hand parts cautiously if their history includes elevated voltage, overclocking, delidding, or inadequate cooling.
Rank #4
- 【Processor】 Powered by the Intel Core i9-12900K processor, this system features 16 cores and 24 threads to handle demanding applications and complex multitasking. It includes 30MB of Intel Smart Cache and 14MB of L2 cache, operates at a 3.2 GHz base frequency, and can reach up to 5.2 GHz with Intel Turbo Boost Max Technology 3.0—enabling responsive performance for content creation, data analysis, gaming, and professional-grade productivity.
- 【RAM and Storage】 Supports configurations of up to 64GB of DDR5 RAM for efficient multitasking across memory-intensive applications and browser tabs. Storage options include up to 4TB of PCIe M.2 SSD, offering faster boot times, improved file access speeds, and ample space for projects, media libraries, and software installations.
- 【Operating System】 Comes with Windows 11 Home (64-bit, English) pre-installed, providing a familiar and secure interface with built-in productivity features and regular updates for a reliable out-of-the-box experience.
- 【Keyboard and Mouse】 Includes a Lenovo Black Wired Keyboard and Mouse set for dependable, plug-and-play input. The wired connection offers consistent responsiveness for daily computing tasks in work or home environments.
- 【Tech Specs】 Offers a practical range of connectivity options: 7x USB ports for peripherals, dual-monitor support via HDMI and VGA for expanded display setups, Wi-Fi 6 and Bluetooth 5.2 for capable wireless performance, and Gigabit Ethernet (RJ-45) for stable wired network access.
What motherboard does it need?
The 12900KS uses LGA1700 and is supported by compatible 600-series or 700-series motherboards, subject to BIOS support. An older board may need a BIOS update before it recognizes the processor. Choose the DDR4 or DDR5 board deliberately, and check its power-delivery cooling and settings for sustained high-power work; basic socket compatibility alone does not make every board an equally good match.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Does the 12900KS make sense to buy in 2026?
Intel’s product page lists the boxed 12900KS as retired and discontinued. Its launch recommended price was $739, versus $589 for the 12900K. Intel’s current ordering page also shows a $813 recommended customer price; that is a product-page price signal, not a reliable measure of used-market value or current street pricing. A discontinued listing does not mean no stock exists, but availability, warranty, and condition can vary. Check Intel’s launch announcement and Intel’s ordering page.
For an existing LGA1700 system
It can make sense as a used or clearance upgrade if the price is close to a regular 12900K, the motherboard has suitable BIOS support and power delivery, and you already have cooling capable of handling it. The KS is harder to justify when it carries a large premium over the 12900K for a small average gaming lead.
Best Value
- Built for the Next Generation of Gaming. Game and multitask without compromise powered by Intel’s performance hybrid architecture on an unlocked processor.
- Integrated Intel UHD 770 Graphics
- Compatible with Intel 600 series and 700 series chipset-based motherboards
- The processor features Socket LGA-1700 socket for installation on the PCB
- 30 MB of L3 cache memory provides excellent hit rate in short access time enabling improved system performance
For a new gaming build
Usually look at a current platform instead. AMD’s US store lists newer X3D processors, including the Ryzen 7 9800X3D and 9850X3D. Prices observed on AMD’s US store during an August 2026 crawl were $459 on one listing and $479 on another for the 9800X3D, and $499 for the 9850X3D; these are time-sensitive store observations, not guaranteed prices or a controlled performance ranking. AMD also listed the Ryzen 9 9950X3D at $699 and the 9950X3D2 at $899 in that period, options more relevant to buyers combining gaming with substantial multi-core work than to value-focused gaming builds. Check the AMD US processor store and AMD gaming and personal computing store for current listings. Available evidence here does not establish a like-for-like 2026 gaming leaderboard, so it cannot support an exact current ranking.
For an AM4 owner or an Alder Lake enthusiast
The Ryzen 7 5800X3D remains relevant to an existing AM4 owner seeking a gaming upgrade without replacing that platform, although it is an older part and has less general-purpose multi-core capacity than the 12900KS. For an Alder Lake enthusiast, collector, or period-correct build, the KS can still be appealing on its own terms—provided its price and cooling demands are acceptable.
Verdict
The Core i9-12900KS earned a launch-day gaming crown in Tom’s Hardware’s 1080p test suite, but it was a halo product, not a value winner. Its small lead over the 12900K, high cooling demands, and discontinued status make it a buy chiefly when discounted for an existing LGA1700 system—not a default pick for a new 2026 gaming PC.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
Recommended Free Tools
