Division 2.1 Idle state power
United Kingdom
From 1 March 2020, the idle state power (Pidle ) of servers, with the exception of resilient servers, HPC servers and servers with integrated APA, shall not exceed the value calculated using the following equation:
Pidle = Pbase + ΣPadd_i
where Pbase is the basic idle state power allowance in Table 3, and ΣPadd_i is the sum of the idle state power allowances for applicable, additional components, as determined per Table 4. For blade servers, Pidle is calculated as the total measured power divided by the number of installed blade servers in the tested blade chassis. For multi-node servers, the number of sockets are counted per node while Pidle is calculated as the total measured power divided by the number of installed nodes in the tested enclosure.
Table 3
Base idle state power allowances
| Product type | Base idle state power allowance, Pbase (W) |
|---|---|
| 1-socket servers (neither blade nor multi-node servers) | 25 |
| 2-socket servers (neither blade nor multi-node servers) | 38 |
| Blade or multi-node servers | 40 |
Table 4
Additional Idle Power Allowances for Extra Components
| System characteristics | Applies to | Additional idle power allowance |
|---|---|---|
| CPU Performance | All servers | 1 socket: 10 × PerfCPU W 2 socket: 7 × PerfCPU W |
| Additional PSU | PSU installed explicitly for power redundancy | 10 W per PSU |
| HDD or SSD | Per installed HDD or SSD | 5,0 W per HDD or SSD |
| Additional memory | Installed memory greater than 4 GB | 0,18 W per GB |
| Additional buffered DDR channel | Installed buffered DDR channels greater than 8 channels | 4,0 W per buffered DDR channel |
| Additional I/O devices | Installed devices greater than two ports of ≥ 1 Gbit, onboard Ethernet | < 1 Gb/s: No Allowance |
| = 1 Gb/s: 2,0 W/Active Port | ||
| > 1 Gb/s and < 10 Gb/s: 4,0 W/Active Port | ||
| ≥ 10 Gb/s and < 25Gb/s: 15,0 W/Active Port | ||
| ≥ 25 Gb/s and < 50Gb/s: 20,0 W/Active Port | ||
| ≥ 50 Gb/s 26,0 W/Active Port |