Memory Frequency, Memory Mode, Demand Scrubbing

RMC 7189

1U Rackmount System

Memory Frequency

Use this option to force the system memory to run at a different frequency than the default frequency. The available options are Auto, Force DDR-800, Force DDR-1066, and Force DDR-1333.

Memory Mode

The options are Independent, Channel Mirror, Lockstep and Sparing. Independent - All DIMMs are available to the operating system.

Channel Mirror - The motherboard maintains two identical copies of all data in memory for redundancy. Lockstep - The motherboard uses two areas of memory to run the same set of operations in parallel.

Sparing - A preset threshold of correctable errors is used to trigger fail-over. The spare memory is put online and used as active memory in place of the failed memory.

Demand Scrubbing

Demand Scrubbing is a process that allows the North Bridge to correct correctable memory errors found on a memory module. When the CPU or I/O issues a demand- read command, and the read data from memory turns out to be a correctable error, the error is corrected and sent to the requestor (the original source). Memory is updated as well. Select Enabled to use Demand Scrubbing for ECC memory cor- rection. The options are Enabled and Disabled.

Patrol Scrubbing

A memory error-correction scheme that works in the background looking for and correcting resident errors. The options are Enabled and Disabled.

Throttling - Open Loop

Throttling improves reliability and reduces power in the processor by automatic voltage control during processor idle states. Available options are Disabled and Enabled. If Enabled, the following items will appear:

Hysteresis Temperature (This feature is available when Closed Loop is enabled.)

Temperature Hysteresis is the temperature lag (in degrees Celsius) after the set DIMM temperature threshold is reached before Closed Loop Throttling begins. The options are Disabled, 1.5oC, 3.0oC, and 6.0oC.

Guardband Temperature (This feature is available when Closed Loop is enabled.)

This is the temperature which applies to the DIMM temperature threshold. Each step is in 0.5oC incre- ment. The default is [006]. Press "+" or "-" on your keyboard to change this value.

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