The maximum power for workstations (AC) is found by the simultaneous operation of two industry standard benchmarks:
Linpack to stress the core system (e.g., processor, memory, etc.) [using "n" arrays] and
SPECviewperf® (version 9.x or higher) to stress the system’s GPU.
This test must be repeated three times on the same UUT, and all three measurements must fall within a ± 2% tolerance relative to the average of the three measured maximum power values.
Maximum Power Testing
*Set the meter to begin accumulating true power values at an interval of 1 reading per second, and begin taking measurements. Run SPECviewperf and as many simultaneous instances of Linpack as needed to fully stress the system.
*Accumulate power values until SPECviewperf and all instances have completed running. Record the maximum power value attained during the test.
Standby (Off Mode) Testing
*With the UUT shut down and in Standby, set the meter to begin accumulating true power values at an interval of 1 reading per second.
*Accumulate power values for 5 additional minutes and record the average (arithmetic mean) value observed during that 5 minute period.
Idle Mode Testing
*Switch on the computer and begin recording elapsed time, starting either when the computer is initially switched on, or immediately after completing any log in activity necessary to fully boot the system. Once logged in with the operating system fully loaded and ready, close any open windows so that the standard operational desktop screen or equivalent ready screen is displayed.
*Exactly 15 minutes after the initial boot or log in, set the meter to begin accumulating true power values at an interval of 1 reading per second. Accumulate power values for 5 additional minutes and record the average (arithmetic mean) value observed during that 5 minute period.
Sleep Mode Testing
*After completing the Idle measurements, place the computer in Sleep mode. Reset the meter (if necessary) and begin accumulating true power values at an interval of 1 reading per second. Accumulate power values for 5 additional minutes and record the average (arithmetic mean) value observed during that 5 minute period.
Category A: All desktop computers that do not meet the definition of either Category B or Category C below will be considered under Category A for ENERGY STAR qualification.
Category B: To qualify under Category B desktops must have:
- Multi-core processor(s) or greater than 1 discrete processor; and
- Minimum of 1 gigabyte of system memory.
Category C: To qualify under Category C desktops must have:
- Multi-core processor(s) or greater than 1 discrete processor; and
- A GPU with greater than 128 megabytes of dedicated, non-shared memory.
In addition to the requirements above, models qualifying under Category C must be configured with a minimum of 2 of the following 3 characteristics:
- Minimum of 2 gigabytes of system memory;
- TV tuner and/or video capture capability with high definition support; and/or
- Minimum of 2 hard disk drives.
Tools developed specifically for the ENERGY STAR Partnership Agreement to scientifically capture desktop PC usage scenario data for power efficiency analysis:
PC Usage [by Via] is a program that collects computer activity as well as application activity.
UTrack [by Intel] is a program that collects time stamped data on CPU activity (C-States and allocation), and I/O activity via keyboard or mouse.
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