已发表 5日 六月 2011 经过 乔恩·斯凯夫 & 根据 其他硬件. 最近更新时间 24日 一月 2012 .
该 sys­tem in ques­tion pulls ~45w idle and ~247w under full load. I’m assum­ing an AMD Radeon HD 6870 (18w idle, 163w full) instead of the EN9400GT (11w idle, 23w full), the power num­bers are adjus­ted accord­ingly. All of these estim­ates are delib­er­ately on the high side. I expect a typ­ic­al PC will spend more time off, more time idle, and wont be loaded as intensely as the example.
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.
(45w ^) Effi­ciency at load
(247w ^) 东方. A.C. 功率消耗
(idle) 东方. A.C. 功率消耗
(负载) Sav­ing
ATX v2.2 400w 65% (at 45w) 70% (at 247w) 69w ^ 353w ^
Season­ic X‑400 80.4% (at 42.6w) 91% (at 248.4w) 56w ^ 271w ^ £31.43
Cor­sair AX850 77.3% (at 43w) 90.4% (at 251w) 58w ^ 273w ^ £29.70
Ener­max Modu87+ 500w 77.5% (at 43.4w) 90.5% (at 250.6w) 58w ^ 273w ^ £29.88
Cor­sair CX400W 73.2% (at 43.2w) 85.5% (at 250.6w) 61w ^ 289w ^ £23.14
King­win Lazer Plat­in­um 550W 83.2% (at 41.6w) 93.8% (at 248.6w) 54w ^ 263w ^ £34.89
HuntKey Jump­er R90 300W 80+ Gold 88% (at 60W) 89% (at 250w) 51w ^ 281w ^ £32.59
The con­clu­sion is no longer clear. The value of an upgrade has improved over the pre­vi­ous scen­ario with a gam­ing PC. How­ever, even with a lot of heavy use, and com­par­ing the most effi­cient 电源供应器’s with the worst a budget ATX 电源供应器 can per­form, a new 电源供应器 will still take around 4 years to pay for itself. A real world upgrade is unlikely to net this much saving.
If you are con­sid­er­ing repla­cing an exist­ing 电源供应器 my advice would be not to both­er, unless you have addi­tion­al reas­ons. If you are buy­ing new then it is worth pay­ing more for a bet­ter 电源供应器, with­in reas­on. Of course if you want the effi­ciency for oth­er reas­ons (低噪声, low heat) then those factors may make the value dif­fer­ence irrelevant.
Cor­rec­ted slight error for Modu87+ and added the HuntKey Jump­er R90. This 电源供应器 changes the con­clu­sion for any­one with a low effi­ciency 电源供应器. It pro­duces sav­ings of over £30, which is approx­im­ately the price of the 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.
PSU效率: 值得升级? 第三部分