Memory Performance tuning – AM3+ / DDR3

PLEASE NOTE THAT THE AMD PRODUCT WARRANTY DOES NOT COVER DAMAGES CAUSED BY RUNNING COMPONENTS OUTSIDE OF SPECIFICATION INCLUDING DAMAGES CAUSED BY OVERCLOCKING (EVEN WHEN OVERCLOCKING IS ENABLED WITH THE AMD OVERDRIVE UTILITY).

Memory clock speed is tied to HT ref. clock with certain ratios. The following Memory clock modes are available on the AMD “Scorpius” platform technology with AM3+ socket and DDR3 support:

∙DDR3-800 (400MHz) – 2:1 ratio

∙DDR3-1066 (533MHz) – 8:3 ratio

∙DDR3-1333 (667MHz) – 10:3 ratio

∙DDR2-1600 (800MHz) – 4:1 ratio

∙DDR3-1866 (933MHz) – 14:3 ratio

∙DDR3-2133 (1066MHz) – 16:3 ratio *

∙DDR3-2400 (1200MHz) – 6:1 ratio *

(* = not an officially supported memory clock mode

In the case of AM3+ DDR3 platform and AMD FX-series CPUs there are two key strategies for Memory tuning:

1)utilize the maximum memory clock mode that matches your DIMM module specification (or known performance tuning headroom) - example DDR3-1866 or DDR3-2133 mode with CL9-11-9 timings

2)utilize a lower memory clock mode with faster CL5-5-5…CL7-7-7 timings and HT ref. clock boost (the amount of HT ref. clock boost will depend on the DIMM OC headroom) – example DDR3-1600 mode with CL6-6-6 timings

Please refer to the DIMM module specification to determine the optimal Memory voltage value (example 1.65V).

The optimal Tras and Trc timing parameter value is calculated as follows:

Tras = Tcl + Trcd + Trp

Example: Tras should be set to 21 in case of CL7-7-7 -settings

Trc = Tras + Tcl

Example: Trc should be set to 28 in case of CL7 + Tras = 21 -settings

NOTE: Setting Trc to a higher value may improve the margins – example: 42

Enabling 2T –timing mode can improve stability with 4GB or 8GB memory configurations (but will cause a slight performance hit).

The Memory controller of AMD Phenom and AMD Phenom II CPUs can be set to run in Ganged mode or in Unganged mode. Ganged mode means that there is a single 128bit wide dual-channel DRAM Controller (DCT) enabled. Unganged mode enables two 64bit wide DRAM Controllers (DCT0 and DCT1).

The recommended setting in most cases is the Unganged memory mode. Ganged mode may allow slightly higher Memory performance tuning and performs well in single-threaded benchmarks.

Depending on the motherboard and BIOS, it may be required manually setting the timing parameters for each DCT (in Unganged mode) when performance tuning the memory or fine tuning the timings. Some BIOS versions apply the same timings automatically for both DCTs in an Unganged mode.

The DIMM slots furthest away from the CPU socket should be equipped first (usually marked as DIMM slot 1&3 or A2&B2).

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AMD FD9370FHHKWOF manual Memory Performance tuning AM3+ / DDR3
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FD9370FHHKWOF specifications

The AMD FD9370FHHKWOF is a powerful processor that has been designed to meet the demanding needs of gamers and professional users alike. This high-performance CPU is part of AMD's FX series and features innovative architecture and advanced technologies that enhance its overall performance and efficiency.

One of the standout features of the FD9370FHHKWOF is its eight cores, which allows for exceptional multitasking capabilities. With a base clock speed of 4.4 GHz and the ability to boost up to 4.7 GHz, this processor is capable of handling intense workloads with ease. Its architecture is built on the 32nm process technology, allowing for reduced power consumption while maintaining high levels of performance.

The FD9370FHHKWOF supports AMD's Turbo Core technology, which automatically adjusts the processor's clock speed to provide maximum performance when needed. This feature ensures that users can enjoy smooth gameplay and seamless application performance during high-demand scenarios. Additionally, the processor supports a range of thermal management technologies, allowing for optimized thermal performance and heat dissipation.

This CPU also integrates the latest in AMD's instruction set, which includes support for AVX, FMA4, and XOP instructions. These enhancements enable improved performance in applications that require heavy numerical processing, making it a particularly attractive option for users engaged in tasks such as video editing, 3D rendering, and simulations.

The FD9370FHHKWOF is compatible with a variety of motherboards that utilize the AM3+ socket, offering flexibility for users looking to upgrade their systems. It supports dual-channel DDR3 memory, with speeds up to 2133 MHz, further enhancing memory bandwidth and overall system responsiveness.

In terms of power consumption, the processor has a thermal design power (TDP) of 220 watts, which means users should pair it with adequate cooling solutions to maintain optimal operating temperatures.

Overall, the AMD FD9370FHHKWOF stands as a formidable option for users seeking a high-performance CPU that can accommodate the demands of modern gaming and professional applications. With its multi-core design, robust clock speeds, and support for advanced computing technologies, this processor is well-equipped to deliver an outstanding computing experience.
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