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Dual Dynamic Power Management
What is Dual Dynamic Power Management (DDPM)?  

AMD OpteronTM systemboards can support a new feature designed to both increase power savings as well as also boost performance for memory-intensive applications. Dual Dynamic Power Management (often referred to a “split plane” by systemboard manufacturers) delivers new levels of performance and power savings by actually splitting the power planes between the processor cores and the integrated northbridge memory controller.

By splitting the power delivery between these two components, the processor is able to better manage the power consumption. When the processor is executing CPU-intensive commands that may not require as much memory bandwidth the northbridge can throttle down the power consumption for more efficiency. In addition, the separate power planes allows the northbridge controller to be run at a higher frequency instead of being tied to the core frequency, allowing the memory to achieve lower latency for better performance.

Dual Dynamic Power Management (DDPM) is a feature that is supported only on the most recent generation of AMD Opteron processors – the native quad-core processors. In order to take advantage of this feature, a platform needs two things: 1.) a quad-core AMD Opteron processor and 2.) a systemboard that supports the splitting of the power planes.

In order to help ensure the greatest level of compatibility for platforms, Dual Dynamic Power Management is both forwards and backwards compatible. Installing an older dual-core AMD Opteron processor in a systemboard that supports DDPM will not present any compatibility issues, the platform should run fine, however it will not be able to take advantage of the DDPM features. Likewise, installing a quad-core AMD Opteron processor into an older systemboard that doesn't support DDPM will not present a problem, the processor should run fine in the older board, but again, without the DDPM features. The real magic happens when you install quad-core AMD Opteron processors into boards that support DDPM, allowing the platform to perform 3-10% better in memory-intensive applications and drawing less power.

Because of the backwards and forward compatibility, system builders can standardize on a system board and use it with either dual-core or quad-core AMD Opteron processors without having to maintain separate board inventory.

When choosing system boards for third generation AMD Opteron processors, remember that you will get the best benefit for your customers by choosing boards that support Dual Dynamic Power Management.

Dual Dynamic Power Management (DDPM) 簡介

Dual Dynamic Power Management (舊稱Split Plan)技術的開發目的,在于節約伺服器平台的耗電、同時提高在記憶體計算密集應用上的效能。主要的技術關鍵,在於將處理器中的計算核心和內建記憶體控制器 的電源供應切割,使計算核心和記憶體控制核心供電各自獨立。

將這兩部分關鍵核心的供電各自獨立,處理器的耗電便能更有效的管理。當處理器在執行CPU密集的指令,也許並不需要太多的記憶體頻寬,此時北橋便可以縮減供電。此外,分離的供電 也讓北橋控制器能在不受CPU核心頻率的影響下,使記憶體能夠降低訊號延遲以提高效能。

Dual Dynamic Power Management (DDPM) 目前只有最新一代的四核心AMD Opteron 處理器 (俗稱Barcelona)可支援。如要應用這項技術,平台須具備兩個要素:1) 採用四核心AMD Opteron 處理 器、 2) 主機板需支援分離電源供應,即DDPM。

為使平台的相容性最佳化,Dual Dynamic Power Management (簡稱DDPM) 平台可向上及向下相容。當採用上一代雙核心AMD Opteron處理器在目前已支援DDPM的平台上,可完全相容,只是無法執行DDPM;如果將四核心AMD Opteron 處理器搭配舊一代不支援DDPM的主機板,也同樣完全相容,處理器也能正常使用,只是同樣的無法執行DDPM功能。DDPM只能在四核心 AMD Opteron 處理器與支援DDPM的主機板相互搭配時,方能展現。DDPM能讓記憶體密集的應用提高約3~10%的計算效能,同時降低耗能。

由於向上及向下相容的特性,系統組裝商便能採用同一款主機板,再按其需要選擇搭配雙核心或是四核心的AMD Opteron 處理器,無須囤積維護多款不同主機板的庫存。