This issue only affects network controllers based on the 82575 or 82576 chipset. The technical product specification (TPS) of your board or system lists the network controller.

Description
System responds slowly after successful Microsoft Windows Server 2008 R2* or Microsoft Windows 7* install.

• System login process is very slow
• Keyboard and mouse response is sluggish
• Task Manager shows high utilization for all CPU core processes

In some cases, the operating system install is not successful. Go to step 3 below for a workaround.

When the ports are not electrically "linked" and the embedded driver is loaded, the DPC (Deferred Procedure Calls) rate steadily increases until the system slows and is unusable.

Solution
Follow the steps below to resolve the issue:

1. Update the system board BIOS to the latest version. Go to Intel Download Center and search for your product name to find the correct BIOS file.
2. Change the BIOS setting, BIOS > Advanced > PCI Configuration > PCI AER Support, to Disable. before installing the operating system.
3. Connect the network ports to a network, switch, or back to back (connect both ends of the network cable to different ports on the same computer) before the operating system loads the embedded NIC driver.
4. After the operating system install completes, download the latest Network Drivers for Windows.

Operating System:

Windows Server 2008 R2 Standard*, Windows Server 2008 R2 Enterprise*, Windows 7 *

This applies to:

Intel® Server Board S3420GP Intel® Server Board S5500BC Intel® Server Board S5500HCV Intel® Server Board S5500WB Intel® Server Board S5520HC Intel® Server Board S5520UR Intel® Server System SC5650BCDP Intel® Server System SC5650HCBRP Intel® Server System SR1600UR Intel® Server System SR1625UR Intel® Server System SR1630BC Intel® Server System SR1630GP Intel® Server System SR1630HGP Intel® Server System SR1690WB Intel® Server System SR2600UR Intel® Server System SR2625UR Intel® Workstation Board S5520SC Intel® Workstation System SC5650SCWS