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Old 04-01-2013, 04:49 AM   #1
altec.gs
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Default Seasonic MTBF

Few months ago, i have checked Seasonic PSU testing methodology, and and their PSU were tested at 45C ambiental temperature at full load and had 100k h MTBF. Today, i checked that again, and now it says they test PSU at 25C at full load without DC FAN. Quality drop?! What do you think?
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Old 04-01-2013, 07:40 AM   #2
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Not really, if they are not using a fan, as you posted. MTBF is not a good way to measure quality, as without knowing how many power supplies they used and how many hours each ran, this value is mostly meaningless. Please read:

http://www.hardwaresecrets.com/dictionary/term/250
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Old 04-02-2013, 08:05 AM   #3
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Quote:
Originally Posted by altec.gs View Post
Few months ago, i have checked Seasonic PSU testing methodology, and and their PSU were tested at 45C ambiental temperature at full load and had 100k h MTBF. Today, i checked that again, and now it says they test PSU at 25C at full load without DC FAN. Quality drop?! What do you think?
How about a link or are you only talking about the new fan specs???

I haven't seen a Seasonic PSU advertised power rating at a particular temperature since the S/M12II, which is about 2010.

5. Operating Environment
Operating temperature: 0 to 50C. Relative Humidity: 20% to 80%.
(The rated power will reduce from 100% to 80% from 40C to 50C)
Relative Humidity: 20% to 80%.
http://www.seasonicusa.com/M12II-Bronze.htm

For example a 650W unit is really rated at 40C and rated at 520W at 50C.

My year old Seasonic unit hides the the 0 to 50C operating temperature spec on the last page of the manual and the rated power reduction note is not included.
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Old 04-02-2013, 08:37 AM   #4
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http://www.seasonic.com/pdf/datashee...tive%20PFC.pdf
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Old 04-02-2013, 08:59 AM   #5
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Thanks. Now I understand you are talking about Mean Time Between Failures. I should have realized this when I read your OP.
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