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Check out this article talking about a study illustrating the performance benefits of their LightPulse 8GB adapters when used with Windows Server 2008 Hyper-V, the performance results from your fibre card will be dependent on the driver, the server and operating system configuration as well as the SAN storage and switch. Regardless, check the article below:

Emulex

Study Shows Emulex 8Gb/s HBAs Consistently Deliver Better CPU Effectiveness in Windows Server 2008 Hyper-V Virtualized Server Environments

COSTA MESA, Calif., May 26, 2009 -

* Emulex Corporation (NYSE:ELX) today announced that its LightPulse 8Gb/s Fibre Channel Host Bus Adapters (HBAs) consistently deliver better CPU effectiveness in Windows Server 2008 Hyper-V virtualized server environments over comparable solutions from its key competitors.

* Overall, Emulex LightPulse LPe12002 8Gb/s HBAs showed 37 to 78 percent higher CPU effectiveness when compared to dual-channel 8Gb/s HBAs from its nearest competitors, QLogic and Brocade, in an evaluation report from Demartek, a firm specializing in independent analysis and lab validation testing of server, storage and security technologies.

* Greater CPU efficiency enables higher consolidation ratios and provides greater cost savings in virtualized server deployments.

* Emulex 8Gb/s HBAs deliver improved enterprise scalability and flexibility through an advanced driver, unique dynamic interrupt coalescing and support for Message-Signaled Interrupts eXtended (MSI-X), offering end users greater CPU effectiveness, reduced system latency and improved I/O throughput – all of which contribute to increased server virtualization performance and reduced power consumption.

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