This is the third installment in a series of articles addressing PSU efficiency. Article one focused on a theoretical new server, art-icolo 2 su una typical desktop PC. This article will focus on a current real server, and introduces a new PSU — an 80+ platinum model.
The system spends a lot of time semi-idling (serving network and disk requests but not doing too much CPU opera). 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 single-core) su nForce 630i / 7050 motherboard. 2Gb DDR-II||35In|
|2x Samsung F4 2Tb HDDs, 7x 1Tb verde HDD inc. WD verde 1Tb, Seagate 1Tb and Samsung 1Tb, 1x unità 7200rpm WD 750GB, 1x Maxtor 300Gb 7200rpm drive, 1x WD 200Gb 7200rpm disco IDE||108In|
|Areca 1220 RAID Scheda||5In|
|2x 120mm Case Fan||2In|
Per interesse, 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 PSU!
Il ATX specifica richiede 70% efficiency. Below is a comparison between a bare minimum ATX PSU e pochi altamente efficiente PSU'S.
Il dato del generico PSU 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||Est. A.C. assorbimento di potenza||Sav-zione|
|ATX v2.2 250w ATX||70% (a 150W)||215In|
|Seasonic X-400||88.8%||169In||£ 40.39|
|Cor-Sair AX850||87.4%||172In||£ 38.02|
|Ener-Max Modu87 500W||88.5%||169In||£ 39.89|
|Cor-Sair CX400W||82.1%||183In||£ 28.31|
|Kingwin Tempo libero Platinum 550W||93.3%||161In||£ 47.54|
|HuntKey Jumper R90 300W 80+ Gold||90%||167In||£ 41.74|
conclusione: This is the first scenario where new higher-efficiency PSU are reasonably price competitive based only on power usage. For such a system, a high efficiency PSU will pay for itself within approximately 3 years. If you plan to keep the system for more than 3 years a high efficiency PSU 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 PSU changes the conclusion conclusively. It produces savings of over £40, che è almeno il prezzo del PSU! Un periodo di recupero di 1 anno, with an expectation that electricity prices will continue to rise is well worth the investment.
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