AMD CBS — что это в BIOS
Продвинутым пользователям известно хорошо как важна тонкая настройка параметров работы компьютера. Далеко не все из них можно настраивать средствами операционной системы. Некоторые доступны только в настройках BIOS.
В этой статье мы рассмотрим один из таких параметров — AMD CBS и постараемся ответить на вопрос: «AMD CBS — что это в биосе?». В качестве стенда использовалась материнская плата ASRock B450 Pro4. В BIOS других плат интерфейс настройки будет в разной степени отличаться.
Что такое AMD CBS в BIOS?
Аббревиатура CBS расшифровывается как Common BIOS Specifications. Этот раздел находится на вкладке Advanced:
Перейдя в него, мы увидим ещё несколько подразделов:
Рассмотрим каждый из них.
1. CPU Common Options
CPU Common Options (или Zen Common Options в старых версиях BIOS) содержит в себе инструменты гибкого управления состоянием процессора. Здесь доступны большое количество настроек. О некоторых из них, таких, как Downcore Control и Global C-State Control , есть статьи на нашем сайте.
Все эти настройки касаются работы центрального процессора. Здесь доступна настройка режимов энергосбережения, присутствует возможность разгона процессора путём изменения режимов Pstates — самый, наверное, полезный подраздел в AMD CBS.
2. DF и UMC Common Options
В этих подразделах доступна тонкая настройка работы оперативной памяти. Перечень параметров показан на скриншоте:
По умолчанию все параметры установлены в значение Auto.
Если вы знаете что с этим делать, настраивайте. Если же не нет, то лучше эти параметры не менять, оставив всё как есть. Производитель позаботился о корректности настроек по умолчанию за вас. Это правило относится почти ко всем настраиваемым в BIOS параметрам. Однако, если вы что-то всё же случайно изменили и не уверены, всегда есть возможность откатиться к заводскому состоянию настроек BIOS.
Во многих подразделах содержатся также и свои подразделы с параметрами, но в данном случае наша задача — разобраться, что такое AMD CBS.
3. NBIO Common Options
Группа параметров NBIO Common Options позволяет настроить работу интегрированных в процессор устройств. Это встроенное графическое ядро, аудиоустройство, а также линии PCIe. О последних, кстати, есть статья на нашем сайте.
Раздел XFR Enhancement интересен тем, что в нём можно настроить параметры технологии Precision Boost Overdrive, позволяющей получить ощутимый прирост производительности процессоров AMD Ryzen. О том, что это за параметр и как он настраивается, можно узнать в этой статье.
4. FCH Common Options
В этом разделе можно настроить работу интерфейсов подключения внешних устройств (USB, SATA и т. д.). Перечень доступных в этом разделе подразделов показан на скриншоте:
Выводы
В этой статье мы рассмотрели все представленные в разделе AMD CBS подразделы в настройках BIOS. Все они предназначены для настройки и отладки работы компонентов компьютера: процессора, оперативной памяти, подключаемых и внутренних устройств. Большинство из представленных параметров лучше не настраивать не имея достаточно опыта для этого. Тем не менее, более широкий выбор возможностей, предоставляемый этим настройками, всегда полезен.
AMD Overclocking Terminology FAQ
This Terminology FAQ will cover some of the basics when overclocking AMD based CPU’s from the Ryzen series. This covers the Zen, Zen+ and Zen 2 architectures and all products stemming from those architectures. Going over some of the basics of BIOS settings and what a function is or why it should be turned on or off and under what condition(s). These settings will vary from motherboard and CPU as well as the degree to which they can be set in the BIOS.
The Basics.
What is a VRM?
VRM stands for Voltage Regulator Module and is located close to the CPU socket to provide a reliable and clean power supply. The VRM regulates the power from the PSU. In overclocking you modify BIOS settings to instruct the VRM for increased performance at the expense of increased heat output. Motherboards for overclocking come with a high-quality VRM that uses better components. But a VRM always consists of MOSFET’s, Chokes, Capacitors, and a PWM Controller. The IC(Integrated Circuit)is there to control and regulate those components.
What is the difference between Ryzen and Zen?
Ryzen and Zen are the same, whereas Zen is the architecture and Ryzen is the product name of the AMD consumer-based CPU’s. So Ryzen CPU’s are based on the Zen architecture, Zen 1 architecture is used for the Ryzen 1000 series CPU’s(Ryzen 1600X et), Zen+ is used for the Ryzen 2000 series CPU’s(2600X etc.). Zen 2 architecture is used for the Ryzen 3000 series(3600X etc.) Zen 3 architecture is used for the Ryzen 5000 series(5600X etc).
What is AMD CBS?
Custom settings for your Ryzen CPU’s that are provided by AMD, CBS stands for Custom BIOS Settings. Settings like ECC RAM that are not technically supported but work with Ryzen CPU’s as well as other SoC domain settings.
What is PBO?
Precision Boost Overdrive(PBO) is the AMD automatic overclocking solution for the Ryzen CPÚs. Initially released on the Threadripper HDT CPU’s and should not be confused with Precision Boost what dictates the Frequency Range boosting table. It comes default on motherboards that have a design spec of 88w and/or 60A or higher using CPU’s that have a 65W TDP or higher.
What are save voltages for Ryzen APU internal GPU?
The internal Vega GPU is the same on all Ryzen APU variants. The RX Vega 11 and RX Vega 8 internal GPU frequency can be overclocked.
What are save voltages for Ryzen SoC?
SoC voltage is the same for all architectures with the Ryzen CPUs. And are used when overclocking the FCLK(Infinity Fabric) and MCLK(Memory Frequency). And in some cases can help to stabilize CPU overclocking.
What are save voltages for Ryzen CPU’s?
Each Zen architecture has it’s own AMD recommend, and Community recommended voltages. Save voltages are to ensure your CPU will have a long life span. Dangerous voltages may damage or degrade a CPU. The table below has the save voltages for each of the Zen architecture released by AMD.
BIOS Settings.
What is VDDCR CPU Load Line Calibration?
CPU LLC adds extra voltage to compensate for Vdroop when a CPU or GPU is put under heavy load. LLC gives overclocking stability by preventing low or high voltage fluctuations and tries to maintain a stable voltage supply to the CPU or GPU. Higher LLC tends to overshoot more in voltage supply, and a lower LLC tends to undershoot in the voltage supply to the CPU.
What is VDDCR CPU Current Capability?
It is a threshold for the VRM to shut down and monitors the current supply to the CPU, setting Current Capability higher will allow for more current supply to the CPU but will increase heat output. This works best if you have an overclock that shuts down the motherboard/PC because the threshold is triggered.
What is VDDCR CPU Switching Frequency?
Switching frequency is the transient response of your VRM MOSFETs settings this higher in Mhz will allow for a better transient response at the expense of increased heat output and using a lower setting in Mhz will lower the heat output but lower the transient response. Better transient response in overclocking translates into a more stable voltage supply from your PSU to the CPU.
What is VDDCR CPU Power Duty Control?
This will allow for setting the current supply to the internal CPU voltage regulator at the expense of increased heat when set to extreme and lower heat when using optimized or standard. This will help with stability in overclocking and give the best result when using optimized or extreme.
What is VDDCR CPU Power Phase Control?
This affects your VRM Power Phases to the CPU and will be depending on the setting, achieve greater stability in overclocking. Setting Power Phase Control to extreme keeps the number of active CPU power phases at the maximum. If you set Power Phase Control to optimized, there will be a power-saving, but less stability, phases to the CPU will power down.
What is SOC?
SOC(AMD) stands for System On Chip and is also known as uncore(Intel) and encompasses all the components, not in the core of the actual CPU but on the same substrate like internal GPU, Cache, I/O Ports, Memory Controller etc. Overclocking SOC settings can help in varying degrees with keeping CPU core components stable.
What is VDDCR SOC Load Line Calibration?
SOC LLC adds extra voltage to compensate for Vdroop when uncore is put under heavy load LLC gives overclocking stability by preventing low or high voltage fluctuations and tries to maintain a stable voltage supply to the uncore. Higher LLC tends to overshoot more in voltage supply, and a lower LLC tends to undershoot in the voltage supply to the SoC.
What is VDDCR SOC Current Capability?
It is a threshold for the VRM to shut down and monitors the current supply to the SoC, setting Current Capability higher will allow for more current supply to the SoC but will increase heat output. This works best if you have an overclock that shuts down the motherboard/PC because the current threshold is triggered.
What is VDDCR SOC Switching Frequency?
Switching frequency is the transient response of your VRM MOSFETs settings this higher in Mhz will allow for a better transient response at the expense of increased heat output and using a lower setting in Mhz will lower the heat output but lower the transient response. Better transient response in overclocking translates into a more stable voltage supply to the SoC.
What is VDDCR SOC Power Phase Control?
This affects your VRM Power Phases to the uncore and will be depending on the setting, achieve greater stability in overclocking. Setting Power Phase Control to extreme keeps the number of active SoC power phases at the maximum If you set Power Phase Control to optimized there will be a power-saving, but less stability, phases to the CPU will power down.
What is VDDCR SOC Voltage?
This setting affects the voltage supply to the SoC components. It should be increased when overclocking the CPU core frequency/ratio to aid with better stability of the SoC components as well as the core components. Increasing the VDDCR SOC Voltage will increase the heat output of the CPU package as a whole.
What is CPU Core Ratio?
Sets the clock rate of your CPU by a factor of 10X. So a Core Ratio of 40.00 will multiply the external clock with a base value of 100 to 4,0Ghz.
What is VDDCR CPU Voltage?
Sets the voltage for your CPU on a 1:1 ratio, depending on your motherboard you can either enter a manual value of an offset value. So a value of 1.4000 will set the CPU voltage to 1.4 volts using the manual setting.
What is FCLK?
Stands for Infinity Fabric Clock Speed(FCLK) and can be adjusted with the new Ryzen 3000 series(Zen2). In previous Zen and Zen+ architecture, the Infinity Fabric Clock speed would be set by the DRAM frequency(MCLK). Ideally, you want FCLK to run synchronously(1:1 ratio) with the MCLK for best performance. In short, a DDR4(Double Data Rate) kit is rated for 3600Mhz MCLK and therefore will run synchronously with 1800Mhz FCLK, a 1:1 ratio.
What is the GFX clock frequency?
Sets the clock rate of the internal Vega GPU on Ryzen APUs by a factor of 1:1, so a 1600 value translates into a 1600mhz GPU clock speed.
What is the GFX core voltage?
Sets the voltage for the internal Vega GPU on Ryzen APUs on a 1:1 ratio, so a manual value of 1.25000 is 1.25 volts.
What is AMD SAM?
Stands for Smart Access Memory and work with the AMD 5000 series CPUs and AMD 6000 GPU’s. In short, it is a new way for your PC to access the whole memory capacity(VRAM) of an AMD 6000 series GPU. Previously this was done with 256MB paging of the VRAM called BAR(Base Adress Register). Depending on your motherboard brand it can be found in the PCIe section of the advanced menu or advanced settings and turn on Above 4G Encoding and Re-Size BAR Support.
What is DRAM Voltage?
Is the voltage supply to your RAM aka Memory sticks, increasing the DRAM voltage will allow your RAM to run at a higher frequency at times without changing the DRAM Timings but will increase heat output.
What is Global C-State Control?
This sets the idle states of a CPU when it is not executing commands there a various C-States and serve as a power-saving function. For overclocking, this should be turned off since you want maximum performance at the expense of increased power consumption and helps with keeping a stable overclock.
Closing thoughts.
The main reason to write this FAQ is to supplement guides for AMD Ryzen based CPU’s found on this website, and I could not find a one-stop-shop solution for ensuring I nail the explanation for each BIOS settings correctly. You can find my guides for the AMD Ryzen CPU’s in the bullet list below.
ASRock
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Вопросы-Ответы
Выберете одну из следующих категорий, если вы знаете, к какой из них относится ваш вопрос:
Результаты:
O:Следуйте этой инструкции:
1. Зайдите в настройки BIOS
2. Внесите следующиен изменения:
a. Advanced\AMD CBS\NBIO Common Options\GFX Config IGC :Forces
b. Advanced\AMD CBS\NBIO Common Options\UMA Mode : UMA_Spec
c. Advanced\AMD CBS\NBIO Common Options\UMA Frame Buffer Size: Choose a prefer size 
d. OC Tweaker\OC Mode Change Switch\AMD CBS Setting 
AMD Overclocking vs CBS menu
What are the differences between these two menus in the BIOS? There are settings such as PBO that are both of these menus. Which one should I be adjusting? Also, should I adjust timings and voltages in AMD CBS or the main CPU/RAM settings page of my BIOS?
If you flashed BIOS with the latest AGESA 1.0.0.4B then raise VDDG inside the AMD Overclocking menu. There's only one VDDG value in CBS menu but two values (for IOD & CCD) in the overclocking menu. The one in CBS doesn't seem to set CCD voltage which is what I need for 1900 fclk. Other things can be adjusted in main BIOS screens or CBS, better do it there.
thanks for the tip. I was having this exact issue last night with VDDG
From what I understand, after being in contact with some board manufacturer employees, the AMD Overclocking menu is part AMD's AGESA code provided to the board vendors. This cannot be hidden or removed. The AMD CBS menu is by the board vendors themselves. Both aim to get similar things done, but it seems that AMD has put a lot of work into making the AMD Overclocking section more powerful and legible over the course of several updates.
I've seen people say that sometimes settings and values set in the AMD Overclocking menu sometimes persist through a CMOS Reset, BIOS updates, etc. I'm, not sure how true that is. In any case, I've always used the AMD CBS menu but it seems that the AMD Overclocking provides some further tweaking options that others have found useful.