[Teaching] [CPU advanced in pceva superfrequency book] am3 platform overfrequency tutorial

AMD platform has always provided strong overclocking performance and a variety of playability. Last month, amd just released the LEO platform, now let's take a look at the LEO platform with the latest 890 series chipset and ddr3 memory. What kind of surprises can it bring to us during overclocking. Now use ASUS The m4a89gtd Pro/usb3 motherboard is used as an example to describe overclocking BIOS settings in detail. First, let's introduce my basic configurations: CPU: AMD Phenom II X4 955 (Rev C3, batch: cacac 0942 dpmw) Motherboard: ASUS m4a89gtd Pro/usb3 F3-12800CL7D-4GBECO memory: G. Skill Video Card: 890gx set display hd4290 Radiator: thermalright ultra 120 extreme Power Supply: acbel ipower 510 Disclaimer: I am writing this tutorial for reference only. All BIOS settings are not representative. Do not follow this tutorial unless hardware conditions permit, I am not responsible for any hardware damage caused by overclock reading this tutorial. The following is the official start. First, enter the bios ai tweaker

Target CPU frequency: the CPU clock speed currently set, which determines the CPU performance. CPU clock speed = External frequency X frequency doubling. How high the clock speed is depends on your CPU constitution, heat dissipation conditions, and voltage settings. Based on my experience, lists the stable clock speed that some CPUs can achieve under the standard voltage of V and air cooling conditions (this is a general situation, data is for reference only, depending on the CPU constitution and cooling conditions ):
Thuban (ccbbe rev E0, model: 1090 T, 1055 T, 960 T): 3.8g
-4 GB

Deneb (cacac rev C3, model: 965,955,555): 3.8g-4g

Deneb (cacyc rev C2, model: 965,955,550): 3.6g-3.8g

Deneb (caczc rev C2, model: 720,710): 3.4g-3.5G

Deneb (cacvc rev C2, model: 940,920): 3.4g-3.6g

Propus (cadac rev C2, model: 630,435): 3.4g-3.6g

Regor (caeec rev C2, model: 250,245): 3.4g-3.7g
Target DRAM frequency:

The current memory frequency directly determines the memory bandwidth. With the current am3 platform, the memory frequency above MHz is an ideal stable overclocking performance, and the limit can reach MHz or above. Of course to achieve this frequency, you also need to have a strong memory, ordinary DDR3-1333 memory to achieve this frequency is relatively difficult.

CPU level up:

The automatic overcpu multiplier option varies depending on the installed CPU. Here I installed 955, so the options include phenom II 965 and phenom II 3.6g, however, you only need to manually set this item to auto.
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CPU frequency settings:
AI overclock Tuner: Specifies the overclock option, which can be set to automatic or manual. Here, select manual to adjust the following options.
CPU ratio: Set the CPU frequency doubling. The amd black edition series CPU does not lock the frequency doubling. Therefore, you can increase the frequency doubling. If it is not a black box CPU, this option cannot exceed the default CPU frequency doubling value. In amd
On the K10 family CPU, the frequency doubling can be X in step.
CPU bus frequency: Outside CPU, will be directly linked to multiple parameters, such as HT frequency, IMC frequency (CPU-NB frequency), memory frequency and so on. Increasing the main board's North Bridge voltage and CPU vdda voltage (PLL voltage) can increase the limit value of the outer frequency. Set the memory frequency and Nb frequency together with the multiplier.
PCIe frequency: PCIe bus frequency. This option will directly affect your video card and peripheral devices. We recommend that you do not change it to reduce instability.
DRAM frequency: Memory frequency (Frequency Division) setting. The Asus motherboard provides the memory frequency for real-time computing. You can use this number to divide it by the external frequency to obtain the actual memory Frequency Division, for example, 1856/232 = 8, this means that the memory frequency is 8 times the external frequency, that is, 1600. Why is it 1600? Because in the default 200 outside frequency, the memory is 8 times the external frequency is just DDR3-1600, in some motherboard also expressed as 4.00x, the actual memory frequency calculated based on the equivalent frequency of the DDR is 800 MHz. The meaning is the same regardless of the format. In addition, the motherboard provides 1333 (DDR-6.67x, 3.33x), 1066 (DDR-5.33x, 2.66x), and 800 (DDR-4.00x, 2.00x) options. If you are using black
Edition CPU, in the case of overclock, because it can increase the frequency doubling, the external frequency does not need to be improved much, you can maintain a 1600 frequency division to overclock the memory to reach more than MHz. If not, you need to set the memory frequency to 1333 or lower to ensure that the memory frequency is not too high when the high external frequency is reached.
CPU/Nb frequency: the CPU memory controller frequency, which also greatly affects the memory performance and is the same as the amd cpu's L3 cache, therefore, increasing this frequency will also help improve the overall performance, especially in applications with a large number of caches. This option is to adjust the CPU-NB multiplier, the default is 10x, In the Asus bios, this frequency is also based on the CPU-NB frequency
= Out-frequency × CPU-Nb multiplier real-time computation, if you are using a black edition CPU, the CPU-NB multiplier will also not be locked, here I set it to 12x, the CPU-NB frequency is 232x12 = 2784 MHz. Generally on AMD K10 family CPU, the CPU-NB frequency can reach 2600-2800 MHz, and the Thuban core of the improved memory controller can reach MHz or higher.
HT link speed: This option adjusts the frequency doubling of the HT bus. Currently, amd K10 family uses the ht3.0 bus, which supports a maximum of GHz HT bus frequency. Therefore, the maximum HT frequency doubling is 13X. The same HT bus frequency = External frequency × HT multiplier. In order to maximize the performance of the integrated video card, we will slightly overspeed it to 2784 MHz. Note that HT frequency cannot be higher than CPU-NB frequency.
DRAM timing configuration: memory timing settings. I will introduce them in detail later.
DRAM driving configuration: Memory instruction driver settings, which are not changed.

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Various voltage settings:

CPU
& Nb Voltage Mode: Voltage setting mode. There are two options: Offset and manual. Because offset adds a difference value based on the default voltage, it must be calculated by default voltage, this option is not recommended if you do not know the default voltage. Therefore, manual is selected here to set the actual voltage intuitively. The gray values of the following voltages are the actual voltages of the current set values. The values in the brackets below can be set and modified. If the values are yellow or red, the voltages are relatively high. When the heat dissipation is good, the yellow or red voltage may not be dangerous. Note: Increasing any voltage will increase the power consumption and power generation of this part, and there is a risk of damage to this hardware. If you do not know where the voltage is or how heat dissipation is, do not change or add too much voltage.
CPU voltage: CPU core voltage. I have overclock the CPU to 3944 MHz, so I have increased the CPU voltage to V to ensure CPU stability. In the case of long-term stable use and poor heat dissipation conditions, we do not recommend that the safe CPU voltage exceed 1.45 v. Some people emphasize the default voltage. In fact, no matter whether your silent voltage is 1.15v or 1.425 V, since it is the core of Deneb, I think the Safe voltage is no more than 1.45 v, when the heat dissipation is good and the ambient temperature is not very high, it can be increased to 1.5 V. If you are using AMD's original radiator and the room temperature is above 30 degrees, it is not recommended that the voltage exceed 1.35v, even if the default voltage is higher than this number.
CPU/Nb voltage: CPU-NB voltage, that is, the memory controller voltage, note that this voltage is added to the CPU memory controller part, too high voltage will damage the CPU, it is recommended that the voltage not exceed 1.35 v. When the CPU-NB frequency exceeds 2600mhz, you may need to add this voltage to 1.25-1.35 V, while at 2800mhz or above, you may need 1.35v or even higher voltage. Note: Black
The default CPU-NB voltage for the edition CPU is 1.1 V, while other CPUs are 1.17v or higher, which only provides offset on some boards, it is not recommended to increase the CPU-NB voltage in offset mode when you don't know your CPU-NB default voltage. In addition, under the default voltage of 1.1-1.175v, The CPU-NB frequency can generally exceed about MHz.
CPU vdda voltage: cpu pll voltage. Increasing this voltage will improve the stability of current signals. Because I have not learned any circuit knowledge, I will not explain this much. The default vdda voltage of the CPU is 2.5 V. Increasing the voltage helps increase the limit value of the outer frequency. In this case, the external frequency only exceeded 230, so you do not need to increase the voltage.
DRAM voltage: Memory voltage. ddr3 memory generally exceeded the maximum value when it is 1.65v, which is also the rated voltage of high-frequency ddr3 memory. In addition, if the memory is not an 8-layer PCB, it is not recommended to set the memory voltage to more than 1.65 v. Of course, there are also very few exists about V super-frequency capability is the best.
HT voltage: Ht bus voltage. The default value is 1.2 V. We only need to overclock the HT bus to about GHz, so it can be stable without changing.
NB voltage: the voltage of the North Bridge, which is actually the voltage of the integrated video card. The default value is 1.1 V. Because I want to overclock the video, it is helpful to increase the voltage greatly, we recommend that you use up to 1.3 V for a long time.
NB 1.8 V voltage: This is the North Bridge PLL voltage, which is conducive to the increase of the external frequency. In the case of low external frequency, it will not be changed.
SB voltage: South Bridge voltage, which generally does not need to be changed.
Sideport memory voltage: On-board gddr3 display voltage. The default value is 1.5 V. Increasing to V helps increase the display frequency. In the test, we found that 1.7v and 1.8v are not as good as 1.6v.

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CPU load-line Calibration: CPU Pressure Drop prevention settings,EnableThen the CPU voltage becomes more stable.

CPU/Nb load-line Calibration: CPU-NB Voltage Protection Pressure Drop settings, the same as above.

CPU spread spectrum: the CPU frequency fluctuates to ensure high frequency and stability,CloseThis option.

PCIe spread spectrum: The PCIe frequency fluctuates, same as above.

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Integrated graphics card overclocking settings:

Internal graphics mode: uma is the shared system memory, and sideport is the on-board Display memory. This parameter is set to Uma + sideport to maximize performance. If you do not want to use the integrated video card, you can set it to disabled.

Uma frame buffer size: shared system memory settings: Set the set display performance to the maximum 512 MB. If you do not want to share the system memory, you can select sideport in the previous setting. This option is hidden.

Sideport clock speed: Specifies the on-board memory display frequency. The on-board 1600 NS ddr3 memory is nominal at a frequency of 1760 MHz. Here we overclock the memory to MHz.

Enhanced igpu speedstep: integrated graphics card core frequency automatic overclocking, set to extreme is overclocking to 1000 MHz.

GFX engine clock override: enable/disable the overclock option of the integrated video card. The core frequency setting of the Integrated Video Card is displayed at the bottom. The default value is 700 MHz. You can manually enter a digital overclock, after it is disabled, you can use the GPU boost software that is attached to Asus Turbo Evo in Windows to overclock.

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Memory timing settings:

Here, I will not explain the specific parameters used to set memory parameters. If you are interested, please search for them. I will provide a detailed introduction online. Here, I will briefly explain the impact of the main parameters on the overclocking and performance.

Dram cas # latency: Memory Cl value. Usually ddr3 is 6 to 9. At such a high memory frequency, cl6 is hard to achieve, so we set it to 7. This parameter has a great impact on overclocking and performance.

DRAM Ras # To CAS # delay: The trcd value of the memory. To achieve high frequency on the am3 platform, the vast majority of memory needs to be relaxed. We set this parameter to 9. This parameter has the greatest impact on overclocking performance and also has a great impact on performance.

DRAM Ras # pre time: the TRP value of the memory, which is generally set to the same Cl value. This option has little impact on the overclocking capability, but cannot be too tight.

DRAM Ras # Act time: the tras value of the memory, which has a slight impact on performance and stability. Under the premise of stability, try to reduce it as much as possible. I used to set it to three times the CL value, therefore, set this parameter to 21.

DRAM row cycle time: the TRC value of the memory. Similar to TRAS, it has a slight impact on performance and stability. If it is too tight, it will not be able to open the machine, it is higher than the value of trcd + tras to achieve better stability.

DRAM ref cycle time: the trfc value of the memory. If it is set to 110ns or 160ns, the maximum value can be exceeded. If it is set to too high, performance will be affected. If it is set to too low, stability will be affected or even machine startup will be affected, depends on the memory.

DRAM command rate: Memory Cr value, set to 1 TB to achieve better performance, but it will slightly affect the limit frequency. In general, the performance of 1 TB is better than that of 2 TB.

Other parameters have little impact on the memory. Keep the default value. If you need to adjust the value, you can tighten it slightly to achieve better performance, but also affect stability.

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In general, overclocking is still a process of constant exploration, rather than a process of simulation, because everyone has different hardware conditions, before super frequency, you should have a rough idea of how far your hardware can go. This will help you avoid a lot of detours. Finally, I wish you a good super frequency performance!