This is the third installment in a series of articles addressing 电源供应器 efficiency. Article one focused on a theoretical new server, 艺术ICLE 2 在 typical desktop PC. This article will focus on a current real server, and introduces a new 电源供应器 — an 80+ platinum model.
The system spends a lot of time semi-idling (serving network and disk requests but not doing too much CPU 工作). I estimated that it would pull around 150W on average, and then calculated it below. It really did come out exactly like that!
|Base system Sempron LE-1100 (1.9GHz单核) 上的nForce 630I / 7050 motherboard. 2Gb DDR-II||35w ^|
|2x Samsung F4 2Tb HDDs, 7X 1Tb的绿色硬盘INC. WD绿色1Tb的, Seagate 1Tb and Samsung 1Tb, 1X WD 750GB 7200转驱动器, 1x Maxtor 300Gb 7200rpm drive, 1X WD 200GB 7200转IDE驱动器||108w ^|
|槟榔 1220 RAID 卡||5w ^|
|2x 120毫米机箱风扇||2w ^|
不感兴趣, assuming a cost of £0.10 per kWh this system would cost a total of £131.50 a year to run even with a perfectly efficient 电源供应器!
该 ATX specification requires 70% efficiency. 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. I have calculated a best-case yearly saving, based on a kWh charge of 10p and assuming 24.7 usage.
|Make / Model||Efficiency at 150W||东方. A.C. 功率消耗||Saving|
|ATX V2.2250瓦特 ATX||70% (在150W)||215w ^|
|Seasonic X‑400||88.8%||169w ^||£40.39|
|Corsair AX850||87.4%||172w ^||£38.02|
|Enermax Modu87+ 500w||88.5%||169w ^||£39.89|
|Corsair CX400W||82.1%||183w ^||£28.31|
|Kingwin Lazer Platinum 550W||93.3%||161w ^||£47.54|
|HuntKey Jumper R90 300W 80+ Gold||90%||167w ^||£41.74|
Conclusion: This is the first scenario where new higher-efficiency 事业单位 are reasonably price competitive based only on power usage. For such a system, a high efficiency 电源供应器 will pay for itself within approximately 3 years. If you plan to keep the system for more than 3 years a high efficiency 电源供应器 is a worthwhile investment as its TCO will be lower. As energy prices continue to rise this TCO advantage will widen.
Added the HuntKey Jumper R90. This 电源供应器 changes the conclusion conclusively. It produces savings of over £40, 这至少的价格 电源供应器! A payback period of 1 年, with an expectation that electricity prices will continue to rise is well worth the investment.
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