HP 4X - DDR InfiniBand Mezzanine HCA Introduction

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. Bloc
k 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. Hyper-
Threading 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 multi-
threaded 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.
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HP 4X - DDR InfiniBand Mezzanine HCA Specifications

General

Brand	HP
Model	4X - DDR InfiniBand Mezzanine HCA
Category	Server
Language	English