I have a server that operates 24.7. It occurred to me that I may be able to save some money on electricity bills if I could reduce its power consumption. It already has a low power AMD Sempron LE-1100 CPU so the power draw of the system should be quite low, 但 电源供应器 is quite old and not especially efficient. This got me thinking about Power supplies designed for low power systems. There are plenty of 80+ certified 电源供应器’s out there with 500+ watt ratings, but are these actually worth the investment for a low power system?
My system spends most of its time idle so I decided I’d work out the power draw would be if I were to build a new system with current components to do it’s job..
|Base system (e.g. atom or Core i5)||18w ^|
|4x 2Tb (e.g. Samsung EcoGreen F3)||19w ^|
|RAID 卡 (e.g. 槟榔 1220)||5w ^|
|1x 120mm Case / 硬盘 Fan (e.g. Nexus Real Silent 120mm)||1w ^|
Using the above figures, I estimate that a new system with a similar role and capability to what I have will consume just under 45watts at idle.
For a typical low spec (450w) 电源供应器, this load is only 10%. At this low a load a typical 电源供应器 can be quite inefficient. 该 ATX specification requires 70% efficiency at 20% of rated power, but a 43W draw is below 20% rated power for all 电源供应器’s rated for 250W or above (in effect all 电源供应器的). Below is a comparison between a bare minimum ATX 电源供应器 and a few highly efficient 电源供应器的.
The figure for the generic 电源供应器 is based on the minimum requirement and is therefore a worst case. Even with a very poor efficiency 电源供应器 the AC draw from the wall won’t increase as the DC draw decreases. I have calculated a best-case yearly saving, based on a kWh charge of 10p and assuming 24.7 用法.
|使 / 模型||Efficiency at 43W||东方. Total power draw (idle)||Saving|
|ATX V2.2250瓦特 ATX||70% (at 50W)||61w ^|
|Seasonic X‑400||80.4% (at 42.6W)||53w ^||£6.97|
|Corsair AX850||77.3% (at 43W)||55w ^||£5.09|
|Enermax Modu87+ 500w||77.5% (at 43.4W)||56w ^||£5.21|
|Corsair CX400W||73.2% (at 43.2W)||59w ^||£2.35|
|Sparkle Power SPI220LE FlexATX 220W||80.5% (at 42.4w)||53w ^||£7.02|
|HuntKey Jumper R90 300W 80+ 金||85% (at 30w)||51w ^||£9.50|
Conclusion: For a low power system it is cheaper, and probably more environmentally sound to keep (or re-use) an existing power supply than to replace it with a high power model, even if the new model is very efficient.
Corrected a calculation error and added the HuntKey Jumper R90. Even a very good value, highly efficient 电源供应器 can’t change the conclusion much in this scenario — the savings are just far too small to justify the cost (and environmental cost) of a new 电源供应器. The HuntKey would take in excess of 3 years to pay for itself, and this is in an ideal scenario, compared to a a worth case scenario 电源供应器! For an even lower power system (e.g. a AMD E350) the savings would be lower still. Even a “perfect” 电源供应器 would only net savings of around £16 a year!
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