Intel DZ77GA-70K / DZ77RE-75K Desktop Board Performance Tuning Guide
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B Parameter Descriptions for
Memory Performance Settings
NOTE
All multiplier values listed in Table B- are applied to the single 100 MHz (default) host
clock.
Table B-1. Memory Performance Settings
Setup Option Description
Performance
Memory Profiles
Automatic setting uses specification compliant values provided by the memory module.
If the memory module supports XMP there will be additional selections for each profile
stored in the module. Selecting a profile will populate all the settings with values
recommended by the DIMM manufacturer. Selecting Manual Mode after XMP allows the
user to change each of the settings.
Memory
Multiplier
Allows selection of memory speed from a list of choices.
tCL Column address strobe (CAS) Latency: The amount of time in cycles between sending a
read command and the time to act on it.
tRCD Row address strobe (RAS) to CAS Delay: The amount of time in cycles for issuing an
active command and the read/write commands.
tRP RAS Precharge Time: This is the minimum time between active commands and the
read/writes of the next bank on the memory module.
tRASmin Minimum RAS Active Time: The amount of time between a row being activated by
precharge and deactivated.
tRFC RAS Refresh Cycle Timing: This determines the amount of cycles to refresh a row on a
memory bank.
tRRD RAS to RAS Delay: The amount of cycles that it takes to activate the next bank of
memory.
tWR Write Recover Time: The amount of cycles that are required after a valid write operation
and precharge.
tWTR Write to Read Delay: The amount of cycles required between a valid write command and
the next read command.
tRTP Controls the number of clocks that are inserted between a row precharge command and
an activate command to the same rank.
Memory Voltage Changes the voltage applied to the memory.
Command Rate The amount of time that commands can be issued.
tRC Determines the minimum number of clock cycles used complete row activation to
precharging of the active row.
tFAW Specifies the time window where four activates are allowed in the same rank.
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