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Builder’s Guide for AMD Athlon™ 64 Processor-Based
Desktops and Workstations
31684 Rev. 3.00 September 2004
Table 2. Power Worksheet 2—Total Watts
Voltage Level and Total Current
(V
x A = W)
Total Watts
for Each Voltage Level
+3.3 V x (total amps) Total Watts for +3.3 V
+5 V x (total amps) Total Watts for +5 V
+12 V (I/O) x (total amps) Total Watts for +12 V (I/O)
+12 V (processor) x (total amps) Total Watts for +12 V (processor)
–12 V x (total amps) Total Watts for –12 V
+5 VSB x (total amps) Total Watts for 5 VSB
Total= Total Combined Wattage=
Note: To calculate the processor current at 12-V VRM source:
25.1
12
current coreprocessor voltagecoreprocessor
I ×
×
=
Where 12 = VRM source voltage and 1.25 is the reciprocal of the 80% voltage regulator
efficiency.
4.3 AMD Athlon™ 64 Processor Thermal Solution
Guidelines
This information is only a guideline for the systems being constructed and is not intended to be a
substitute for system builder verification, validation, and testing on the reliability and
effectiveness of a thermal solution.
For reliable operation of AMD Athlon 64 processor-based systems, the selection of the correct
thermal solution is critical. For a list of heatsink suppliers that have developed products designed
to support AMD Athlon 64 processors, please visit our Web site.
http://www2.amd.com/us-en/Processors/DevelopWithAMD/1,,30_2252_869_9460^10668,00.html?1081351292
In EMEA, for a list of heatsink suppliers that have developed products designed to support
AMD Athlon 64 processors, please visit our Web site.
http://www2.amd.com/gb-uk/Processors/ProductInformation/1,,30_118_3734_4348%5e4356,00.html?1083742688
This selection of suppliers found at these Web sites is frequently updated and not intended to be a
comprehensive listing of all heatsinks that support AMD Athlon 64 processors.
28 Hardware Considerations
Chapter 4