The U.S. Environmental Protection Agency (EPA) has begun drafting version 3 of its ENERGY STAR efficiency specification for computer servers. As with the current version, a server must meet all of the following criteria to be part of this program:
- Marketed and sold as a computer server
- Packaged and sold with at least one AC-DC or DC-DC power supply
- Designed for and listed as supporting at least one or more computer server operating systems and/or hypervisors
- Targeted to run user-installed enterprise applications
- Provides support for ECC and/or buffered memory
- Designed so all processors have access to shared system memory and are visible to a single OS or hypervisor
The following products are excluded from the program: fully fault tolerant servers, server appliances, high performance computing systems, large servers, storage products including blade storage, and network equipment.
Major elements of draft 1 include:
- More stringent power supply efficiency 80+ Platinum efficiency levels are being proposed for power supplies shipped with the server, as shown in Table 1 below. Power Factor requirements stay the same as the current version.
Table 1. Minimum Power Supply Efficiency
|Power Supply Type||Rated Output Power||Minimum PSU Efficiency|
|10% Load||20% Load||50% Load||100% Load|
|Multi-output (AC-DC)||All output levels||N/A||90%||92%||89%|
|Single-output (AC-DC)||All output levels||83%||90%||94%||91%|
- Idle state power requirement revision The EPA is proposing tighter idle state power limits for all one and two socket servers, including multi-node, blade and resilient1 categories. Measured idle state power must be less than the calculated maximum idle state power using the following equation:
Where PIDLE_MAX = maximum idle state power requirement, PBASE = base idle power allowance as specified in tables 2 and 3, and PADDL_i = idle state power allowance for additional components, as specified in table 4.
Table 2. Base Idle State Power Allowance – One Socket Servers
|Category||Resilient||Base Idle State Power Allowance, PBASE (W)|
Table 3. Base Idle State Power Allowance – Two Socket Servers
|Category||Blade or Multi-node||Resilient||Base Idle State Power Allowance, PBASE (W)|
Table 4. Additional Idle Power Allowances for Extra Components
|System Characteristic||Applies To:||Additional Idle Power Allowance (W)|
|Additional Power Supplies||Power supplies installed explicitly for power redundancy||10 W per power supply|
|Storage Devices||Per installed storage device||4 W per storage device|
|Additional Memory||Installed memory > 4GB||0.25 W per GB|
|Additional Buffered DDR Channel||Installed buffered DDR, Channels > 8 (Resilient Server Only)||4 W per buffered DDR channel|
|Additional I/O Devices||Installed devices > 2 ports of ≥ 1 Gbit, onboard Ethernet||<1 Gbit: No Allowance,
= 1 Gbit: 2 W per active port,
>1 Gbit and <10 Gbit: 4 W per active port,
≥10 Gbit.: 8 W per active port
- The development of active state power metrics The EPA intends to include active state efficiency requirements in version 3. Discussions are on-going with stakeholders to develop potential active state efficiency requirements.
- Lower Auxiliary Processing Accelerator2 (APA) idle state power Version 3 requirement reduces the power to 30 W per APA from 46 W per APA in the current version.
Computer server related questions can be sent to email@example.com. Copies of the proposed draft and recent stakeholder meeting materials can be downloaded here.
1. A resilient server is a computer server designed with extensive reliability, availability, serviceability, and scalability features. See Appendix B of the program specification draft for more information. 2APAs are computing expansion add-in cards that can be installed in general purpose expansion slots.