0PSU标志PSU效率: 值得升级? 部分 3

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 PCThis 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-II35w ^
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 RAID5w ^
2x 120毫米机箱风扇2w ^
150w ^

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!

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 用法.

使 / 模型Effi­ciency at 150W东方. A.C. 功率消耗Sav­ing
ATX V2.2250瓦特 ATX70% (在150W)215w ^
Season­ic X‑40088.8%169w ^£40.39
Cor­sair AX85087.4%172w ^£38.02
Ener­max Modu87+ 500w88.5%169w ^£39.89
Cor­sair CX400W82.1%183w ^£28.31
King­win Lazer Plat­in­um 550W93.3%161w ^£47.54
HuntKey Jump­er R90 300W 80+ 金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.

更新资料 (25-DEC-2011)

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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