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Figure 3.1. Screen Displayed When the Watchdog Timer Detects an Issue 3.4.2 Back to BIOS Button A second recovery option is to use the Back to BIOS button that is located on the board’s back panel. This button provides a convenient method of invoking the BIOS setup menu, as shown in Figure 3.2, in a safe, bootable mode without needing to open the system chassis to access the BIOS jumper. When the Back to BIOS button is depressed, both the button and a red LED located on the Intel Desktop Board DP67BG diagnostic LED bank will illuminate. The F9 key can then be used to restore all BIOS settings to defaults at this point or specific performance settings can be individually revised by the user to restore system stability. Additional information regarding this feature can be found in the Intel Desktop Board DP67BG Product Guide. Intel DP67BG Desktop Board Performance Tuning Guide Figure 3.2. Screen Displayed When System is Started With the Back to BIOS Button Depressed 3.4.3 BIOS Configuration Jumper A third recovery option is to use the BIOS configuration jumper that is provided on the board to allow the user to force the board to boot to BIOS Setup in a safe mode. The user will need to open their system chassis to access this jumper. Refer to the Intel Desktop Board DP67BG Product Guide for additional information on using the BIOS jumper for resetting purposes. 3.4.4 Remove Power and Reboot For a system hang, resetting your system or removing and reapplying power and rebooting will allow the system to initiate a reboot. The watchdog timer, the Back to BIOS button, the BIOS configuration jumper, or pressing the F2 key at the setup screen prompt will allow the user to adjust performance settings in BIOS to restore system stability. Intel Desktop Board DP67BG Performance Tuning Guide 3.5 Intel Desktop Board DP67BG Performance Tuning Process There are various sequences of steps possible for doing board performance tuning. The approach presented in this guide is a general starting point, but may not be optimal for all cases. Performance tuning is an iterative process. The settings made for a parameter may affect which settings will work for another parameter. For example, increasing the system clock frequency may require that previous adjustments to the processor turbo ratios be revised downward to maintain processor stability. A full processor and memory tuning sequence consists of the steps suggested below. Depending on your objectives, it may not be necessary to complete all of the steps in this sequence. More discussion about these steps is included in Sections 3.5.1 through 3.5.9. Checking system stability appears frequently during this sequence. This check ensures that the work done up to that point will provide stable system performance. If instability is encountered, the source of the problem can be more easily determined if regular stability checks have been completed. 1. Configure the BIOS for performance tuning. 2. Set processor voltage and turbo ratios. 3. Check stability. 4. Increase system clock frequency. 5. Check stability. 6. Tune memory. 7. Check stability. 8. Reduce voltage, current, and power. 9. Check stability. 10. Re-enable dynamic and burst mode (if possible). 11. Check stability. 12. Reconfigure the BIOS to enable interfaces. 13. Check stability. 14. Archive performance settings. 3.5.1 Configure the BIOS for Performance Tuning It is recommended that non-essential interfaces (such as, onboard audio, USB, LAN, external SATA, etc.) be disabled when performance tuning to simplify the process. Once the performance parameters have been optimized, the onboard features can be re-enabled. Scroll to “Configuration” > “On-Board Devices” and use the submenus to disable these features (refer to Figure 3.3). .. NOTE Do not disable the USB port where the keyboard is connected. Intel DP67BG Desktop Board Performance Tuning Guide Figure 3.3. System Setup Leave Enhanced Intel SpeedStep® Technology and CPU C States enabled in the BIOS as shown in Figure 3.4. Turbo ratios require Enhanced Intel SpeedStep Technology enabled in order to function. Disabling C states prevents the processor from entering 1, 2, or 3 core ratios. Only the 4 core ratio will have an effect when C states are disabled. Intel Desktop Board DP67BG Performance Tuning Guide Figure 3.4. Power Settings Performance tuning options are located in the menu section labeled “Performance”. Reading and agreeing to the disclaimer by selecting “Yes”, as shown in Figure 3.5, allows the detailed BIOS performance menu to be displayed. Intel DP67BG Desktop Board Performance Tuning Guide Figure 3.5. Performance Tuning Disclaimer From the Performance page, processor tuning options are under the “Processor Overrides” section shown in Figure 3.6 below. Also see Appendix A for a table summarizing these settings and their effects. Sections 3.5.1.1 through 3.5.1.8 include guidelines for setting the processor override parameters. Intel Desktop Board DP67BG Performa...