Performance Tuning Guide

Intel DX58SO2/DX58OG Desktop Board Performance Tuning Guide
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Table 3-2. Resulting Memory Frequency Values for Various Multipliers
Multiplier Resulting Memory Frequency (MHz)
8 1066
10 1333
12 1600
14 1866
16 2133
3.5.3.7.4 Going Beyond XMP Profiles
Using XMP profiles provides much of the obtainable memory performance benefit with
minimum effort. Further increases in memory performance can be obtained by setting
the tCL, tRCD, tRP, and tRAS parameters to their maximum values and increasing the
system clock in small increments while checking system stability between each clock
increase until the system becomes unstable. Note that system clock changes will also
affect the processor frequency and may affect processor stability.
Once the point of memory instability has been reached with system clock increases,
reduce the system clock frequency until the memory is once again stable (the board
will boot again). Next, reduce the tCL, tRCD, tRP, and tRAS parameter values until the
system once again becomes unstable, then increase the values by one increment.
3.5.3.8 Tune QPI
If your processor allows, attempt to increase the QPI data rate using the settings
shown earlier in Figure 3.6.
The QPI data rate can be determined according to the following formula:
QPI Data Rate = (QPI data strap) * (percent increase in host clock)
Example: If a QPI data strap of 6.4 GT/s was set and the host clock frequency was
increased by 1%, then the resulting QPI data rate would be (6.4) * (1.01) =
6.44 GT/s.
3.5.3.9 Recheck Stability
Recheck stability as described in Section 3.5.3.6.