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Electrical Specifications

Dual-Core Intel® Xeon® Processor 5000 Series Datasheet

connect to the rest of the chain unless one of the other components is capable of

accepting an input of the appropriate voltage. Similar considerations must be made for

TCK, TMS, and TRST#. Two copies of each signal may be required with each driving a

different voltage level.

2.10

Mixing Processors

Intel supports and validates dual processor configurations only in which both

processors operate with the same FSB frequency, core frequency, 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 [Note: Processors within

a system must operate at the same frequency per bits [15:8] of the

IA32_FLEX_BRVID_SEL MSR; however this does not apply to frequency transitions

initiated due to thermal events, Enhanced HALT, Enhanced Intel SpeedStep®

Technology transitions, or assertion of the FORCEPR# signal (See Chapter 6, “Thermal

Specifications”)]. Low voltage (LV), mid-voltage (MV) and full-power 64-bit Intel Xeon

processors should not be mixed within a system. Not all operating systems can support

dual processors with mixed frequencies. Intel does not support or validate operation of

processors with different cache sizes. Mixing processors of different steppings but the

same model (as per CPUID instruction) is supported. Details regarding the CPUID

instruction are provided in the AP-485 Intel® Processor Identification and the CPUID

Instruction application note.

2.11

Absolute Maximum and Minimum Ratings

Table 2-9 specifies absolute maximum and minimum ratings. Within functional

operation limits, functionality and long-term reliability can be expected.

At conditions outside functional operation condition limits, but within absolute

maximum and minimum ratings, neither functionality nor long term reliability can be

expected. If a device is returned to conditions within functional operation limits after

having been subjected to conditions outside these limits, but within the absolute

maximum and minimum ratings, the device may be functional, but with its lifetime

degraded depending on exposure to conditions exceeding the functional operation

condition limits.

At conditions exceeding absolute maximum and minimum ratings, neither functionality

nor long-term reliability can be expected. Moreover, if a device is subjected to these

conditions for any length of time then, when returned to conditions within the

functional operating condition limits, it will either not function or its reliability will be

severely degraded.

Although the processor contains protective circuitry to resist damage from static

electric discharge, precautions should always be taken to avoid high static voltages or

electric fields

Table 2-9.

Processor Absolute Maximum Ratings

Symbol

Parameter

Min

Max

Unit

Notes1, 2

VCC

Core voltage with respect to VSS

-0.30

1.55

VTT

FSB termination voltage with respect to

VSS

-0.30

1.55

TCASE

Processor case temperature

See

Section 6

See

Section 6

° C

TSTORAGE

Storage temperature

-40

° C3, 4, 5

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