Performance Tuning Guide

Intel
®
Desktop Board DP55KG and Intel
®
Desktop Board DP55SB Extreme Series
Performance Tuning Guide
21
Setup Option Description
Memory Performance Options
Note: All multiplier values listed below are applied to the single 133 MHz
(default) host clock.
tRC Row Cycle Time: The minimum time interval
between successive ACTIVE commands to the same
bank.
tFAW Four Active Window – Period of time before the fifth
successive ACTIVE command to a new memory Bank
can be issued.
Memory Voltage Changes the memory voltage.
Uncore Voltage
Override
Allows the CPU Uncore voltage to be adjusted. (A
good starting Voltage for high frequency operation is
setting the Uncore Voltage to 1.30 V).
Command Rate The amount of time that commands can be issued.
Note: For each of the timings, except the multipliers, the lower the number, the higher the
performance and the less stable the system may become.
5.3. Determining Memory Frequency
Over all, memory frequency can easily be determined by multiplying the host clock frequency
(default is 133 MHz) by the Memory Multipliers shown in Table 3.
Table 3. M
emory Multipliers
Multiplier BCLK (MHz) Resulting Memory
Frequency (MHz)
6 133 800
8 133 1066
10 133 1333
12 133 1600
Increasing the host clock will increase the memory speed as well.
Note: The Intel Core i7-800 and Intel Core i5-700 processor series support only even
multipliers.