HP ML150 HP ProLiant Intel-based 100-series G6 server technology - Page 5

Each link is comprised of 20, one-bit lanes. A maximum of 16 bits are used to transfer data; the remaining 4 bits are used for the protocol and error correction. The interconnect performs a maximum of 6.4 gigatransfers per second and has a bandwidth of 12.8-gigabytes per second in each direction, for a total bandwidth of 25.6 gigabytes per second. If an application requests data from the memory of another processor, the QuickPath interconnect uses high-bandwidth inter-processor communication to retrieve the data. Figure 2. Block diagram of QuickPath architecture Hyper Threading Simultaneous Multi-threading Technology, or SMT, is an enhanced version of Intel's Hyper-Threading technology. SMT lets each core execute two computational threads at the same time. A single processor can execute up to eight threads simultaneously. In addition, the high-bandwidth memory subsystem supplies data faster to the two computational processes than traditional front side buses, and the low-latency cache hierarchy allows more instructions to be processed simultaneously. HyperThreading improves performance per watt, allowing Intel-based ProLiant G6 servers to accomplish more using the same, or less, power than servers based on previous-generation Intel processors. Turbo Boost technology Intel's Turbo Boost technology complements SMT by increasing the performance of both multithreaded and single-threaded workloads. For workloads and applications that do not benefit from multi-threading, Turbo Boost technology can provide better performance. Turbo Boost is engaged by default and automatically increases the clock frequency of active cores operating below power and thermal design points determined by the processor. The maximum frequency depends on the number of active cores and varies based on the specific configuration on a per-processor-number basis. Turbo Boost technology is OS independent, and Advanced Configuration and Power Interface (ACPI) -aware operating systems require no changes to support Turbo Boost technology. 5