How often Does FCLK occur? What FCLK Frequency should you use?

How often does FCLK occur? What FCLK frequency should you use?

FCLK Meaning of Frequency

Modern processors are comprised of linked subsystems like the cache, CPU, or memory controller to boost performance in order to give smooth, powerful, and optimal performance. The entire system is interconnected using the Infinity Fabric architecture, which handles data transfer and control using processor-related parts. The Infinity Fabric Clock, often known as FCLK, is a clock speed that regulates the operation of the Infinity Fabric, a communication highway.

AMD microarchitecture, CPUs, and GPUs have employed the Infinity Fabric connectivity architecture since 2017. The FCLK was separated from the memory when the Infinity Fabric was introduced in AMD’s Zen 2 architecture CPUs, as it is now.

As a result, RAM with little memory now performs better. The FCLK frequency may now be overclocked in the Zen 3 Ryzen 5000 CPUs to 2000 MHz (although this is reliable), which corresponds to RAM operating at 4000 MHz, or Double Data Rate, or DDR.

What is an IF?

The Infinity Fabric was introduced by AMD’s SVP and CTO, Mark Papermaster, in April 2017. The coupled components may expand control and data flow from the die level to the socket level to the board level thanks to this cohesive high-performance fabric. It is incorporated into AMD’s CPU and GPU architecture, which adds speed and improves performance.

The Infinity Scalable Data Fabric (SDF) and the Infinity Scalable Control Fabric are the two distinct communication planes in the Infinity Fabric (SCF). SDF serves as the main conduit for data movement between the system’s endpoints and the PCIe PHYs, memory controller, USB hub, and other calculation and execution units. SDF has several connecting points. Various system control system signals, including testing, security, thermal and power management, and third-party IP, are transmitted under the supervision of the SCF.

Does FCLK affect the performance and speed of RAM?

The fundamental idea underlying the faster performance of RAM is the frequency of the data transfer rate. With FCLK, overclocking RAM has become simple and makes it possible to change particular factors, such as timings and voltages, that enable the operation of CPUs at faster rates. Therefore, FCLK does have a direct impact on RAM speed. However, changing the clock frequency may have an impact on the processor’s stability, security, performance, and longevity.

Addition than FCLK, do AMD Ryzen CPUs have any other clocks?

UCLK: The Unified Memory Controller, or UMC, works at a certain frequency.

MCLK: This stands for memory clock, both internal and external.

The I/O Hub controller interacts with the chip via LCLK, or link clock.

The CPU core and cache work at a frequency known as the core clock, which is essentially the claimed frequency.

How are the UCLK, MCLK, and FCLK frequencies connected?


For the optimal performance with Ryzen 3000 CPUs, the system ratio of the Infinity Fabric Clock and the Memory Controller Clock (UCLK) should be 1:1. When the frequency is up to 3733 MHz, an automatic 1:1 ratio clocking of the FCLK and UCLK occurs. The ratio becomes 2:1 if the frequencies are out of phases, such as 4000 MHz FCLK and 3733 MHz UCLK, or vice versa.


For Ryzen to run better, a frequency ratio of 1:1 is optimum for both FCLK and MCLK. It is advised to utilize RAM at an MHz speed greater than what the Infinity Fabric can handle. It is advised to maintain the timings closer because de-syncing might impair the chip’s performance.

What FCLK frequency should you use?

It’s crucial to understand that while FCLK can operate at any speed, you shouldn’t necessarily use the maximum frequency because doing so might lead to de-syncing and worsen performance. AMD has advised DDR4-3600 users to utilize FCLK @ 1800 MHz for best performance. In general, your FCLK should run at half the speed of your RAM Clock. Because FCLK, UCLK, and MEMCLK are all synchronized together, it’s critical that they do so correctly. In particular, the 1:1 ratio must be preserved for the best performance.

Should you increase the frequency of FCLK?

No, and yes; the decision rests entirely with the user because overclocking has a price. The highest performance from Ryzen CPUs is often obtained when RAM is operating in synchrony with the Infinity Fabric Clock, the Memory Controller, and the UCLK. However, boosting the FCLK frequency might result in RAM latency becoming out of sync and lead to issues like blue screens.


What RAM Frequency Works Best With Ryzen 5000?

For the greatest and most optimized performance when using Ryzen 5000 CPUs with DDR4-4000 RAM, the FCLK frequency should be 2000MHz at a 1:1 ratio between the Infinity Fabric Clock and Memory Clock. Although changing the FCLK and setting it at a high frequency is not a good idea, many AMD supporters do so in order to maximize performance.

Ryzen 5000 CPUs: 2000MHz FCLK Capable?

Yes, it is capable of reaching a frequency of 2000MHz FCLK with ease, however certain other CPUs, such as the Ryzen 5 5600X, are only capable of reaching a frequency of 1900–1800MHz FCLK.

What are the “Best” Ryzen Infinity Fabric and memory settings, then?

The ideal settings for a DDR4 3600 RAM are 1800 MHz memory and 1800 MHz FCLK. It holds true for all CPUs since fewer people would want to increase the SoC voltage to test if a CPU can reach 1900 MHz or not and certain CPUs cannot reach 1900 FCLK. The optimum conceivable setup is a 1:1 ratio between the maximum FCLK and the highest memory frequency.

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