Fujitsu D3320 PRIMERGY BX2560 M2, Reference Manual

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BX2560 M2
D3320 - BIOS Setup Utility 29
Advanced menu
C6
C6 is the C state limit.
C6 (Retention )
C6 Retention is the C state limit.
QPI Link Frequency Select
The QPI frequency can be set to the commonly supported frequencies of
the CPUs.
6.4 GT/s, 8.0 GT/s 9.6 GT/s
(CPU dependent)
Possible speed settings vary with CPU(s) and chipset so different
values are displayed depending on your system. Choose one of
the values to explicitly set the speed the QPI links will be run at.
Auto
The BIOS will find out the maximum speed depending on the
CPU(s) and chipset present in your system.
Uncore Frequency Override
Configures the processor uncore frequency to improve the
I/O performance.
Disabled
The processor autonomously controls the frequency in a
predefined range to save power.
Maximum
The frequency is always set to its predefined maximum. This may
result in an increased power consumption.
Nominal
The processor autonomously controls the frequency in a
predefined range to save power, but not above its nominal
frequency.