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CPU NB performance tuning through the BIOS menu:
1) Set the CPU NB clock speed up to the next available value (example: if 1800MHz / x9 is the default and
NB clock testing via AMD OverDrive utility was OK at 2000MHz then set CPU NB BIOS item to
2000MHz / x10 now)
2) Set CPU NB Voltage to a known stable value (based on the NB clock testing done thru AMD OverDrive
utility)
3) Keep HT Link multiplier at default value or lower it by one step (example: 2400MHz or x12 in the case
of the AMD FX-8150 CPU)
4) Set CPU Core Multiplier(s) / Voltage to a known stable setting before proceeding with CPU NB
performance tuning (to ensure that CPU core doesn’t cause stability issues / crashes)
5) Set Memory clock and timings to known stable settings (example: DDR3-1333 CL9-9-9) note that
Memory interface will also be overclocked when HT ref. clock is adjusted. Memory must be able to run
10% above default clock during the CPU NB tests. Set Memory to DDR3-1333 and boost Memory
voltage to 1.600V to ensure stability
6) Reboot the system with the new CPU NB Multiplier / Voltage value and continue HT ref. clock testing
thru AMD OverDrive™ utility (as instructed in the previous section)
Figure 8: CPU NB settings to adjust from the BIOS menu
The alternative approach is to adjust all the items directly from the BIOS menu and utilize a bootable stand-
alone stability tester such as Memtest86 or Memtest86+ (may be installed on a bootable USB key).
Please refer to “AMD “Scorpius” Platform Technology Performance Tuning Targets” for the expected / optimal
Multiplier and VID values.
PLEASE NOTE THAT THE AMD PRODUCT WARRANTY DOES NOT COVER DAMAGES CAUSED BY
RUNNING COMPONENTS OUTSIDE OF SPECIFICATION INCLUDING DAMAGES CAUSED BY
OVERCLOCKING (EVEN WHEN OVERCLOCKING IS ENABLED WITH THE AMD OVERDRIVE UTILITY).