Performance Tuning Guide

Intel DX58SO2/DX58OG Desktop Board Performance Tuning Guide
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4 Performance Tuning Examples
4.1 Intel Core i7-990X Extreme Edition Processor
on Intel Desktop Board DX58SO2
Figure 4.1 shows the BIOS settings to achieve a speed of 4.50 GHz with an Intel Core
i7-990X Extreme Edition processor. Core ratios were set at 33 and a host clock setting
of 136 MHz was used. A memory speed of 2133 MHz was set using XMP profiles. With
a host clock setting of 136 MHz, the resulting memory frequency was 2181 MHz. A
QPI data strap of 4.8 GT/s was required in order to allow obtaining memory operation
at 2181 MHz. No processor thermal throttling occurred during stress testing with
these settings.
These results were obtained on an Intel Desktop Board DX58SO2 with XMP 2133
memory installed. The board was located on an open bench top and the processor
was air cooled using an Intel tower model E88216-001 fan heatsink.
Figure 4.1. 4.50 GHz on an Intel Desktop Board DX58SO2 with an
Intel Core i7-990X Extreme Edition Processor Using Core Ratio
and Host Clock Changes