TGG POSITION ON THE METRIC TO CALCULATE ICT SERVER CAPACITY

[seanmcilroy29]

TGG Cserv Whitepaper 92.pdf

Executive Summary
The Green Grid (TGG) is proposing PerfCPU (maximum CPU Performance as defined in Standard EN 303 470
Section 5.2 equation) as the standardized metric to calculate the ICT capacity for Servers (Cserv). Cserv is the key
performance indicator (KPI) to report the work capacity of the server infrastructure in a data center as required
under the EU Energy Efficiency Directive (EED) Delegated Regulation (EU) 2024/1364 Annex II section 2.a. The
EED Delegated Regulation points to the reportable value ‘performance in the active state’ (Commission
Regulation 2019/424 - Annex II section 3.1(m)) as the value to be used for Cserv, but a calculation method is
not specified for the value.
Discussions with the European Commission have indicated that the Commission cannot amend the EED
Delegated Regulation (EU) 2024/1364 in a short time frame or publish Guidance or FAQ documents to
designate a calculation methodology for Cserv. Therefore, the Commission has requested that the data center
industry propose and reach a consensus on the correct methodology to use. While TGG would support an
amendment to (EU) 2024/1364 or (Eu 2019/424) to clarify the calculation method for Cserv TGG proposes that
PerfCPU be used as the standardized value to calculate Cserv. The publication of this Whitepaper is the first step
in developing an industry consensus on this issue.
A future whitepaper, planned for publication in 1Q2025, will provide a table of PerfCPU values for different CPU
SKUs (where SERT® data is available for the specific CPU SKU) and detail an estimation methodology to use to
calculate PerfCPU when the CPU SKUs are not known for a data center server inventory.