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EANCK
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加入日期: Aug 2003
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80 plus只是效能認證,並非耐用度保證

80 plus本身是一個硬體效能的認證,
測試內容非常務實、精確,
所以能過關的在"足瓦與否"上沒有疑慮;
但80+並非耐用度的認證,
僅由於測試過程"有點"嚴苛,因此過關者也等於有"基本的"耐用度。

官網有測試白皮書
http://www.80plus.org/research.htm

http://www.80plus.org/documents/Ser...ReportFinal.pdf

以下是節錄部分內容:
[page6:]
We contacted technical representatives from power supply manufacturers and computer manufacturers.
As a result of these conversations, we identified the priorities for the server power supply test protocol.
These priorities are to test for:
 Universal input voltage – test at 115 volts and 230 volts AC
 Test at extremes of load range (0%, 5%,10%, 20%, 50% and 100% of nameplate rating)
 Test for power factor (PF) at each load point
 No redundant mode testing (testing done at low load conditions to simulate load sharing)
 Segregate data into:
 Redundant and non-redundant designs
 Multi-output voltage
 Single output voltage - low (below 20 volts DC)
 Single output voltage - high (above 20 volts DC)

測試負載從0%~100%,而這『100%』是由送測廠商定義的,
意即廠商說這型號是500w的,80plus就只測到500w,並不會側到501w以後(over clock)。

※某些廠商說他們的PSU可提供超出標示 xxx Watts,但超出之後,效率極可能降至80%以下,
怎麼降? 不知道!。

========

※同理,80 plus也沒有公佈負載20%以下時的曲線,但從第10頁的測試圖可知是急轉直下的。
換言之如果你的電腦超省電,待機時耗電80w,滿載時199w,
結果你買1000w(80+)的psu,
1000w的20%=200w,結果省不到電還有嚴重反效果。
個人建議待機耗電控制在psu的30%負載處比較保險。

==============
※從80 plus官網的測試圖,有些型號只要他們少報瓦數,認證等級可以進階1級,甚至以上。
ex:最近的台灣剛發現的新牌子Glacialpower
http://www.80plus.org/manu/psu/psu_...650W_Report.pdf
20%負載時效率就已經有85%了,負載75%時目測轉換效率約82%,
廠商如果送測時報480w我個人猜測銅牌不是問題。

[page7:]
At each loading point, vital measurements such as AC power, voltage, current and power factor and the
DC output power for efficiency calculation were taken and recorded. The power supply was then loaded
to the next higher loading level and allowed to thermally stabilize for a period of 15 minutes.
Measurements were then taken as outlined above and this process was continued until the 100 percent
loading point was reached.

每個測試點僅測試15分鐘,反過來思考,就是保證你在每個負載下用15分鐘是沒有問題的。

有鑑於此,某些大型評測網站才會推出psu的耐力測試,
但是耐力測試硬體設備等級要高,時間愈長愈好,測試數據要詳盡,測試項目要齊全,
否則沒有公信力、參考價值,
因此很難得才能找到一篇。

本人在此拋磚引玉,希望各位網兄能夠提供psu耐力測試的網站,
方便查詢真正優秀的80 plus PSU。
     
      
舊 2009-05-01, 09:14 AM #1
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