0PSU LogoPSU Efficiency 2 - Eine typische Gaming-PC

Fol­low­ing on from the slight sur­prise that a new Netzteil is a poor invest­ment for a low power PC I decided I’d reas­sure myself that an effi­cient Netzteil is a good invest­ment for a typ­ic­al “enthu­si­ast” PC.


To do this depends on the con­fig­ur­a­tion, how much time the PC spends on, and how much time it spends being heav­ily util­ised. I’m basing this on a fairly-high power single-GPU sys­tem with a Core i7 CPU and a Radeon 5870. I’m also going to assume the sys­tem is oper­ated from 3pm — 11pm week­days and 9am — 1am week­ends, mak­ing for a total of 72 hours a week. I’ll also assume the sys­tem spends 50% time idle and 50% full-load.

Die sys­tem in ques­tion pulls ~80w idle and ~340w under full load. Find­ing effi­cien­cies for this is tricky, so the value will be roun­ded up to 400w (die Netzteil’s in ques­tion don’t vary greatly between 300w and 400w)

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. Most sys­tems also use lower power CPU’s and GPU’s too.

The fig­ure for the gen­er­ic Netzteil is based on the min­im­um require­ment and is there­fore a worst case. Auch bei einer sehr schlechten Wirkungsgrad Netzteil die AC-Unentschieden von der Wand nicht zu erhöhen, wie die DC-Unentschieden sinkt. Ich habe ein Best-Case jährlichen Einsparung berechnet, based on a kWh charge of 10p.

Machen Sie / ModellEffi­ciency at idle (80Die)Effi­ciency at load (340Die)Ist. A.C. power draw at idleIst. A.C. power draw at loadSparen
ATX v2.2 400w65% (at 80w)70% (at 400w)123Die486Die
Season­ic X‑40085.4% (at 90.4w)89.9% (at 400w)94Die378Die£25.63
Corsair AX85083.5% (at 90w)89% (at 400w)96Die382Die£24.52
Enermax 500W Modu87 85.9% (at 88.5w)87.6% (at 400w)93Die388Die£23.87
Corsair CX400W81.2% (at 90.2w)81.5% (at 400w)99Die417Die£17.43
King­win Lazer Plat­in­um 550W92.1% (at 91.2w)92.9% (at 400w)87Die366Die£29.19
HuntKey Jump­er R90 300W 80+ Gold88% (at 60w)86% (at 330w)87Die366Die£23.17

A new Netzteil in this scen­ario is prob­ably not advis­able on a fin­an­cial only basis. Even with quite a lot of heavy use, and com­par­ing the most effi­cient Netzteil’s with the worst a budget ATX Netzteil can per­form the sav­ing will take around 5 years to recoup. A real world upgrade is unlikely to net this much sav­ing.

If you are con­sid­er­ing repla­cing an exist­ing Netzteil 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 Netzteil, with­in reas­on. Of course if you want the effi­ciency for oth­er reas­ons (wenig Lärm, low heat) then those factors may make the value dif­fer­ence irrel­ev­ant.

Aktualisierung (25-Dec-2011)

Added the HuntKey Jump­er R90. Whilst it is sold as a 300W Netzteil, it does work slightly above spec, espe­cially if well cooled. This Netzteil does make a bit of dif­fer­ent to the con­clu­sions. It pro­duces sav­ings of over £20, which is a sig­ni­fic­ant pro­por­tion of the price of the NetzteilA pay­back peri­od of 2 Jahr, with an expect­a­tion that elec­tri­city prices will con­tin­ue to rise would cer­tainly be worth think­ing about. How­ever, the HuntKey isn’t spe­cified high enough to really provide for the con­fig­ur­a­tion spe­cified in this scen­ario, and as such we could­n’t recom­mend run­ning it bey­ond its rat­ing.

Haben Sie ein paar Gedanken des eigenen? Lassen Sie sich unten durch die Kommentierung! Wenn Sie bitte abonnieren möchten den Link oben rechts auf dem Menü abonnieren verwenden. Sie können auch unten unter Verwendung der sozialen Bindungen diese mit Ihren Freunden teilen. Prost.

Hinterlasse eine Antwort