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Intel Core i9-11900K vs. Intel Core i9-11900KF

Compare the Intel Core i9-11900K CPU with the Intel Core i9-11900KF in terms of core types, core counts, frequencies, and cache capacities, along with their overclocking, PCIe, and DDR support.

Kevin Jones / TechReviewer

Last Updated: October 24, 2023

This article compares Intel’s Core i9-11900K and Core i9-11900KF desktop CPUs. We evaluated Intel’s Core i9-11900K and Core i9-11900KF desktop CPUs to determine which would be better for various use cases. We shaped our testing methodology to focus on each CPU’s attributes rather than relying solely on benchmarks.

This article helps you make an informed decision by comparing each CPU’s attributes, such as the core types, core counts, frequencies, cache capacities, overclocking capabilities, PCIe support, and DDR support. We’ve examined these attributes for each CPU to help you compare their abilities. By understanding these key factors, you can determine which CPU will best suit your needs and provide the performance you desire.

When selecting a CPU, it’s important to consider your specific needs and use case. Some people may prioritize high clock speeds and single-threaded performance for tasks like gaming, while others may require a higher core count and multi-threaded performance for tasks like video editing or rendering. We’ve analyzed the capabilities to determine which CPU performs best for each use case.

We investigated the capabilities of both CPUs to compare them objectively. Ultimately, the decision between these two CPUs will depend on your specific requirements, budget, and priorities. However, by examining the attributes of each CPU, we aim to provide you with the information needed to make an informed decision.

Performance of the Core i9-11900K vs. Core i9-11900KF

Cores

11900K: Based on our evaluation, the 11900K’s 8 cores allow for excellent performance overall.

11900KF: Based on our evaluation, the 11900KF’s 8 cores allow for excellent performance overall.

Learn more about Core Counts below.

Our chart of the multi-core performance of the Core i9-11900K CPU compared to the Core i9-11900KF and other Intel and AMD CPU models. We calculated the performance score as Core Frequency × Number of Cores, with performance improvements per generation and Efficiency cores supporting a fraction of the P-core performance. TechReviewer

Base Frequency

11900K: The 11900K has a 3.50 GHz base frequency, which is the speed before boosting.

11900KF: The 11900KF has a 3.50 GHz base frequency, which is the speed before boosting.

Learn more about CPU Clock Speeds below.

Our chart of the max base frequency of the Core i9-11900K CPU compared to the Core i9-11900KF and other Intel and AMD CPU models. We based the max base frequency on the max P-core base frequency for Intel 12th Gen and newer CPUs and based it on max base frequency for other CPU models. TechReviewer

Single-Core Turbo Frequency

11900K: Based on our evaluation, the 11900K’s 5.30 GHz single-core max turbo boost frequency is excellent for performance overall. You can maintain these frequencies with a high-end cooler.

11900KF: Based on our evaluation, the 11900KF’s 5.30 GHz single-core max turbo boost frequency is excellent for performance overall. You can maintain these frequencies with a high-end cooler.

Learn more about CPU Clock Speeds below.

Our chart of the single-core boost frequency of the Core i9-11900K CPU compared to the Core i9-11900KF and other Intel and AMD CPU models. We based the single-core boost frequency on the max single-core boost frequency. TechReviewer

P-Core Turbo Frequency

11900K: The 11900K does not have Performance cores.

11900KF: The 11900KF does not have Performance cores.

Learn more about CPU Clock Speeds below.

Overclocking Support

11900K: Based on our evaluation, the 11900K CPU’s support for overclocking can be excellent for performance overall.

11900KF: Based on our evaluation, the 11900KF CPU’s support for overclocking can be excellent for performance overall.

Learn more about Overclocking below.

DDR Support

11900K: Based on our evaluation, the 11900K CPU’s support for DDR4 with a max stock speed of 3200 MHz can be good for performance overall.

11900KF: Based on our evaluation, the 11900KF CPU’s support for DDR4 with a max stock speed of 3200 MHz can be good for performance overall.

Learn more about DDR Support below.

PCIe

11900K: Based on our evaluation, the 11900K CPU’s support for PCIe 4.0 can be excellent for performance overall, when using the fastest SSDs and graphics cards.

11900KF: Based on our evaluation, the 11900KF CPU’s support for PCIe 4.0 can be excellent for performance overall, when using the fastest SSDs and graphics cards.

L3 Cache

11900K: Based on our evaluation, the 11900K’s 16 MB of L3 cache is mediocre for performance overall.

11900KF: Based on our evaluation, the 11900KF’s 16 MB of L3 cache is mediocre for performance overall.

Learn more about Cache Sizes below.

Our chart of the L3 cache capacity of the Core i9-11900K CPU compared to the Core i9-11900KF and other Intel and AMD CPU models. TechReviewer

Use Cases of the Core i9-11900K and Core i9-11900KF

Considerations for Gaming

Based on our evaluation of using Intel’s Core i9-11900K CPU for gaming, you can expect good game performance with a high-performance CPU cooler.

Based on our evaluation of using Intel’s Core i9-11900KF CPU for gaming, you can expect good game performance with a high-performance CPU cooler.

While a good GPU is critical for gaming performance, your CPU will also have a significant impact. If the CPU is too slow, it can be a bottleneck for your GPU, which can reduce your framerate or cause stuttering. The most important CPU capabilities for gaming are single-core max turbo boost frequency and the number of cores.

Depending on the game, the CPU will often handle tasks including scene management, gameplay logic, physics calculations, and asset loading. We took these factors into account when assessing the expected CPU performance for gaming.

Having multiple CPU cores can improve performance with games that utilize them. However, developers cannot split up every task to take advantage of a growing number of cores. Most modern games don’t benefit from having more than 6–8 cores. Game performance will experience diminishing returns as you add more CPU cores.

Considerations for General Apps

Based on our evaluation of using Intel’s Core i9-11900K CPU for general apps, you can expect good app performance with a high-performance CPU cooler.

Based on our evaluation of using Intel’s Core i9-11900KF CPU for general apps, you can expect good app performance with a high-performance CPU cooler.

If you’re only planning to stream shows, use office apps, or browse the internet, you won’t need a top-end CPU to get good performance. The most important CPU capability for general app usage is the single-core max turbo boost frequency.

Browsers depend on your CPU to quickly load pages and video content and manage multiple browser tabs. Higher single-core turbo boost frequencies can speed up page load times.

Office and web applications are typically single-threaded, so running a single application won’t take advantage of a many-core CPU.

The more cores a CPU has, the more applications you can run simultaneously without noticing a performance impact.

Office and web applications rarely max out the CPU for long periods. These applications can use turbo boost speeds when a burst of processing power is needed, returning to the more efficient base frequencies afterward.

We took all of these factors into account while assessing the expected CPU performance for general apps.

Considerations for Professional Tools

Based on our evaluation of using Intel’s Core i9-11900K CPU for professional tools, you can expect good tool performance with a high-performance CPU cooler.

Based on our evaluation of using Intel’s Core i9-11900KF CPU for professional tools, you can expect good tool performance with a high-performance CPU cooler.

Video editors, 2D and 3D graphics tools, software compilers, and engineering tools require high-performing CPUs.

Professional tools are often well optimized to use many cores. CPU cores allow tools to parallelize processing tasks. Increasing the number of cores can divide the time required to process a task if the tool has good multi-threading support.

To maximize performance with professional tools, you’ll want to use a CPU with a high turbo boost frequency and many CPU cores. Good heat dissipation is needed to maintain turbo boost frequencies for extended periods. We took these factors into account while assessing the expected CPU performance for professional tools.

While graphics applications use your GPU for some rendering tasks, most calculations and data operations are still dependent on your CPU.

Considerations for Choosing Between the 11900K and 11900KF

Core Count

Intel’s Core i9-11900K CPUs have 8 cores.

Intel’s Core i9-11900KF CPUs have 8 cores.

We found that, in general, more cores do provide better performance in professional tools and when running multiple applications simultaneously.

Increased core counts can improve the performance of games and professional tools that use them. Most modern games don’t benefit from having more than 6–8 cores. Even general apps can benefit from many cores when numerous applications are open simultaneously. Web browsers don’t significantly take advantage of multiple cores when loading a single page. However, more CPU cores can improve performance when running demanding web apps in multiple windows.

Intel’s 12th generation and newer CPUs have performance cores (P-cores) and efficiency cores (E-cores). The P-cores are comparable to previous generation cores. E-cores are focused on adding additional threads in an energy-efficient manner. They take up much less room on the CPU and generate less heat. However, their smaller cache and minimal interconnect capabilities make them more appropriate for offloading background tasks. E-cores do not support hyper-threading.

CPU Clock Speeds

The Intel Core i9-11900K has a 3.50 GHz base frequency and supports a 5.30 GHz single-core max turbo boost frequency.

The Intel Core i9-11900KF has a 3.50 GHz base frequency and supports a 5.30 GHz single-core max turbo boost frequency.

We’ve experienced that single-core performance is essential for some games, as many don’t take full advantage of multiple cores. Similarly, we have experienced that professional tools depend on high single and multi-core turbo frequencies to maximize their processing speed.

Turbo boost frequencies are only achieved under ideal circumstances. However, with adequate cooling, you may be able to maintain speeds near the max boost frequency.

Check out my article, Choosing the Best CPU Cooler for Intel’s Core i9-11900K , for recommended coolers that can maintain these boost frequencies on the 11900K.

Check out my article, Choosing the Best CPU Cooler for Intel’s Core i9-11900KF , for recommended coolers that can maintain these boost frequencies on the 11900KF.

Higher vs. Lower Base Frequencies

We’ve found that lower base clock speeds result in lower power consumption.

A CPU’s base frequency refers to the clock speed at which its cores run under normal operating conditions. However, the actual clock speed of the CPU can vary depending on the workload and the system power state.

A lower base frequency can lead to better power savings overall since the clock speed decreases when the load is low, resulting in lower power consumption. However, a CPU may run slower than the base frequency to conserve power or reduce heat generation. For example, modern CPUs use technologies like Intel SpeedStep or AMD Cool’n’Quiet to dynamically adjust the CPU’s clock speed based on the system’s workload and power state.

A CPU with a lower base frequency may generate less heat under normal operating conditions, enabling it to boost some cores to higher frequencies while remaining within its thermal limits. This lower base frequency results in better performance than a CPU with a higher base frequency, which may not be able to sustain its boost frequency for long periods due to thermal throttling. However, this is mostly only relevant if your system’s cooling solution can only partially dissipate the heat produced by all cores being fully boosted.

DDR Support

The 11900K CPU’s fastest supported DDR memory type is DDR4, with a max stock speed of 3200 MHz.

The 11900KF CPU’s fastest supported DDR memory type is DDR4, with a max stock speed of 3200 MHz.

You can exceed these stock speeds officially supported by CPUs when overclocking memory, such as with an XMP profile. Motherboard specifications will indicate their supported overclocked-memory speeds. To be able to overclock DDR memory, your motherboard chipset needs to support memory overclocking.

Faster PC memory can improve game and professional tool performance by reducing the time it takes to perform calculations and data operations.

We’ve experienced that using the quickest RAM may not have as much of an impact as upgrading your CPU and graphics card or adding more RAM.

Learn about our recommended RAM for the 11900K in Best RAM for the Intel Core i9-11900K CPU .

Learn about our recommended RAM for the 11900KF in Best RAM for the Intel Core i9-11900KF CPU .

Cache Size

The Intel Core i9-11900K has an L3 cache capacity of 16 MB.

The Intel Core i9-11900KF has an L3 cache capacity of 16 MB.

A CPU’s cache is a small amount of memory, close to the CPU cores, containing recently used data. An L3 cache capacity of at least 20 MB is ideal for games and professional tool performance.

Games and professional tool performance can improve as cache size increases, as it can reduce delays when retrieving commonly used assets from memory. While nearly any task will use a CPU’s cache, our research indicates that a large cache becomes less impactful for general PC usage, such as browsing webpages.

Remember that cache sizes often increase with core counts, so if you want to increase your L3 cache, you may need to get a CPU with more cores.

Overclocking

The 11900K supports overclocking.

The 11900KF supports overclocking.

Overclocking is mainly relevant for PC gamers who want to maximize their game framerates. CPU overclocking increases frequencies past their default limits. Excellent heat dissipation via fans or another solution is required to maintain system stability while overclocking. While we felt a sense of excitement and anticipation when we pushed the limits of our CPU’s performance, it’s essential to remember that overclocking comes with the risk of damaging your system components or voiding warranties.

Professional tools can benefit from overclocked frequencies. However, overclocking may introduce some possibility of system instability, which may be less acceptable in business scenarios. We’ve found out the hard way that losing work due to system instability is a pain.

Intel Core i9-11900K Review – World’s Fastest Gaming Processor?

Intel today launched its 11th Generation Core “Rocket Lake” desktop processor family led by the Core i9-11900K—this is its long-awaited review. With the Core i9-11900K, Intel wants to respond to the AMD Ryzen 5000 series, which snatched overall performance leadership away from the company. Rocket Lake is Intel’s first attempt at improving per-core (single-threaded) performance in several years, through the introduction of the new “Cypress Cove” CPU core. Intel claims IPC gain over the previous generation of up to 19%. The i9-11900K is an 8-core/16-thread processor, which is a step backward from its 10-core/20-thread predecessor, the i9-10900K, but Intel believes that the IPC gain and enhancements to the multi-core boosting algorithm should help recover some of the multi-threaded performance despite the two-core deficit. This is also their attempted hint at the market and software developers that eight cores should be plenty for cutting-edge gaming and client desktop tasks.

The reason Intel had to stop at eight cores for Rocket Lake has more to do with the fact that the processor is still manufactured on the 14 nm silicon fabrication node Intel has been lugging along for six years now. The Core i9-11900K is built on the same Socket LGA1200 package as its predecessor, and the package is physically of the same size as the i7-860 from 2009. The new Cypress Cove CPU cores are significantly larger than the “Skylake” cores on “Comet Lake,” and the new Gen12 Xe LP iGPU is larger than the Gen 9.5 unit, too. As a result, elongating the die to cram in more cores wasn’t an option. Add to this that the 14 nm node limits the power budget, and the 10-core Comet Lake was already flirting with 250 W package power draw. Physically removing the iGPU to make room for the extra two cores wasn’t an option either, as Intel emphasizes the iGPU to sell these chips to the vast majority of desktop users that don’t need discrete graphics. Intel plans to significantly change its mainstream desktop socket with the future generation “Alder Lake,” however.

Why Intel stuck with 14 nm is another mystery. Intel’s position is that to accomplish the performance target of Rocket Lake on the desktop platform, 14 nm was sufficient. Intel already has a more advanced silicon fabrication node, the 10 nm SuperFin, which it’s using to make 11th Gen “Tiger Lake-U” mobile processors with plans to launch a new 8-core “Tiger Lake-H” mobile chip later this year. Mobile processors make up a major share of Intel’s client CPU sales, and with the recent surge in notebook sales, the company wants to maximize its 10 nm foundry utilization for mobile chips. The desktop platform has a relatively “unlimited” power budget compared to mobile, and with 10th Gen “Comet Lake-S,” Intel seems to have decided that it’s willing to take the heat for selling a hot and inefficient desktop chip as long as it’s competitive.

We’ll go into the nuts and bolts of Rocket Lake on the following pages, but put briefly, the chip combines eight new Cypress Cove CPU cores with a Gen12 Xe LP integrated graphics core and an updated platform I/O that includes PCI-Express Gen 4. The chip also puts out eight more PCIe lanes than the previous generation. These contribute to a CPU-attached NVMe interface, much like those of AMD Ryzen chips, and a double-width DMI x8 chipset-bus. The general purpose PCIe connectivity put out by the new Intel 500-series chipsets continues to be PCIe Gen 3.

With this generation, Intel has an ace up its sleeve—DLBoost, or hardware acceleration of AI deep-learning neural net building and training. Intel claims DLBoost accelerates DNN training performance by up to six times compared to normal x86 execution. DLBoost made its debut with the company’s 10th Gen “Ice Lake” mobile processors, and Intel sees huge potential for AI in several client-relevant media tasks, such as quick image and video manipulation—just like on the latest smartphones. The company also put out plenty of developer documentation and is working with ISVs to promote DLBoost. Another feature making its desktop debut is the new AVX-512 instruction set, or at least a truncated version of it, with only client-relevant instructions.

The Core i9-11900K 8-core processor is clocked at 3.50 GHz, with a maximum Turbo frequency of 5.30 GHz using Thermal Velocity Boost and an all-core boost frequency of 4.70 GHz. Each of the eight Cypress Cove cores comes with 512 KB of dedicated L2 cache, and the chip has 16 MB of shared L3 cache. The i9-11900K is unlocked and ready for overclocking. Intel has introduced several new features for overclockers, which we’ll detail on the following pages. The i9-11900K is priced at US$539 in 1,000-unit tray quantities, which should put its retail starting price at around $550, the same pricing territory as AMD’s 12-core Ryzen 9 5900X. In this review, we put the Core i9-11900K through an exhaustive new set of CPU and gaming tests to show you if Intel has managed to take back the crown from AMD.

Intel Core i9-11900K Market Segment Analysis

PriceCores /
Threads
Base
Clock
Max.
Boost
L3
Cache
TDPArchitectureProcessSocket
Core i7-9700K$2908 / 83.6 GHz4.9 GHz12 MB95 WCoffee Lake14 nmLGA 1151
Core i7-10700K$3208 / 163.8 GHz5.1 GHz16 MB125 WComet Lake14 nmLGA 1200
Core i7-11700K$4208 / 163.6 GHz5.0 GHz16 MB125 WRocket Lake14 nmLGA 1200
Ryzen 7 3700X$3308 / 163.6 GHz4.4 GHz32 MB65 WZen 27 nmAM4
Ryzen 7 3800XT$4508 / 163.9 GHz4.7 GHz32 MB105 WZen 27 nmAM4
Ryzen 7 5800X$4508 / 163.8 GHz4.7 GHz32 MB105 WZen 37 nmAM4
Core i9-10900$40010 / 202.8 GHz5.2 GHz20 MB65 WComet Lake14 nmLGA 1200
Ryzen 9 3900X$48512 / 243.8 GHz4.6 GHz64 MB105 WZen 27 nmAM4
Ryzen 9 5900X$55012 / 243.7 GHz4.8 GHz64 MB105 WZen 37 nmAM4
Core i9-9900K$3708 / 163.6 GHz5.0 GHz16 MB95 WCoffee Lake14 nmLGA 1151
Core i9-10900K$47010 / 203.7 GHz5.3 GHz20 MB125 WComet Lake14 nmLGA 1200
Core i9-11900K$5508 / 163.5 GHz5.3 GHz16 MB125 WRocket Lake14 nmLGA 1200
Ryzen 9 3950X$72516 / 323.5 GHz4.7 GHz64 MB105 WZen 27 nmAM4
Ryzen 9 5950X$80016 / 323.4 GHz4.9 GHz64 MB105 WZen 37 nmAM4