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Intel® Xeon® Processor E5-1600 v2/E5-2600 v2 Product Families 139
Datasheet Volume One of Two
Electrical Specifications
7.5 Mixing Processors
Intel supports and validates two and four processor configurations only in which all
processors operate with the same Intel® QuickPath Interconnect frequency, core
frequency, power segment, and have the same internal cache sizes. Mixing
components operating at different internal clock frequencies is not supported and
will not be validated by Intel. Combining processors from different power segments
is also not supported.
Note: Processors within a system must operate at the same frequency per bits [15:8] of the
FLEX_RATIO MSR (Address: 194h); however this does not apply to frequency
transitions initiated due to thermal events, Extended HALT, Enhanced Intel SpeedStep
Technology transitions signal. Please refer to the
Intel® Xeon® Processor E5 v2
Product Family Processor Datasheet, Volume Two: Registers
for details on the
FLEX_RATIO MSR and setting the processor core frequency.
Not all operating systems can support dual processors with mixed frequencies. Mixing
processors of different steppings but the same model (as per CPUID instruction) is
supported provided there is no more than one stepping delta between the processors,
for example, S and S+1.
S and S+1 is defined as mixing of two CPU steppings in the same platform where one
CPU is S (stepping) = CPUID.(EAX=01h):EAX[3:0], and the other is S+1 =
CPUID.(EAX=01h):EAX[3:0]+1. The stepping ID is found in EAX[3:0] after executing
the CPUID instruction with Function 01h.
Details regarding the CPUID instruction are provided in the
AP-485, Intel® Processor
Identification and the CPUID Instruction
application note, also refer to the Intel®
Xeon® Processor E5 v2 Product Family Specification Update
.
Table 7-8. Fault Resilient Booting (Output Tri-State) Signals
Output Tri-State Signal Groups Signals
Intel QPI
QPI0_CLKTX_DN[1:0]
QPI0_CLKTX_DP[1:0]
QPI0_DTX_DN[19:00]
QPI0_DTX_DP[19:00]
QPI1_CLKTX_DN[1:0]
QPI1_CLKTX_DP[1:0]
QPI1_DTX_DN[19:00]
QPI1_DTX_DP[19:00]
SMBus
DDR_SCL_C01
DDR_SDA_C01
DDR_SCL_C23
DDR_SDA_C23
PEHPSCL
PEHPSDA
Processor Sideband
CAT_ERR_N
ERROR_N[2:0]
BPM_N[7:0]
PRDY_N
THERMTRIP_N
PROCHOT_N
PECI
SVID SVIDCLK