Performance Tuning Guide

Intel

Desktop Board DP55KG and Intel

Desktop Board DP55SB Extreme Series

Figure 12. Checking the Uncore Voltage Override

Once the profile has been applied, save the settings and boot into the operating system to

verify system stability using the same methods described in Section 4.3.

5.5. XMP Manual Mode

XMP profiles can provide a starting point for stretching memory performance even further. To

begin, choose the XMP profile first, presetting all profile values. At this point choose “Manual –

User Defined” to set values further.

From here, increase the performance further by setting the tCL, tRCD, tRP, and tRAS values to

their maximum settings and increase the host clock in small increments while checking system

stability between each clock increase until the system becomes unstable.

Once the point of instability has been reached, back down the clock frequency and start

reducing the tCL, tRCD, tRP, and tRAS settings until the system once again becomes unstable,

then reduce them by one increment.

For XMP profiles above DDR3 1600, the BIOS will automatically raise the system BCLK to reach

those memory speeds. This means that when using an Intel Core i7-870 processor running at a

base speed of 2.93 GHz, the processor will run at a maximum frequency of 4.51 GHz. If this

type of fast memory is used, be sure to look at the other processor parameters in the BIOS and

ensure they are set to support the faster processor frequency.