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Can I get a quick electrical lesson. - Page 2

post #11 of 59
got it..they are taking the total wattage output and mult. it by the efficiency rating of the unit. the earth watts is a 80plus certified unit so 69 totals amps on the 12v rail equals 828watts mult. by 80% efficiency equals roughly 662 total watts. this is the only way i can see them coming up with these numbers which means the 650watt unit is more efficient hence the higher wattage output with the same amp rating.
Edited by CSU_ComputerMajor - 12/13/09 at 5:31pm
    
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post #12 of 59
Quote:
Originally Posted by Manyak View Post
The problem is that the difference between those two numbers is only 14.9W, not a whole 100W.


The real difference is that the rails are only rails because they have unique OCP circuit (over current protection). The numbers you are reading are the max current each rail can provide before that circuit trips. What it doesn't tell you is how much power output the rails can handle combined because they all come from the same power source (same bridge rectifier and what not).

For example, these PSUs say 3 12V rails at 22A each. That gives 264W per rail, or 792W total. That's a lot more than you can actually get out of the PSU. The real rating is probably something like 396W on all the 12V rails combined (33A), but you're limited to drawing 22A out of that from a single rail.
Not that it matters much, but it's 22A, 22A, and 25A on both PSUs.
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post #13 of 59
Quote:
Originally Posted by TwoCables View Post
Not that it matters much, but it's 22A, 22A, and 25A on both PSUs.
Yeah well...same crap
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post #14 of 59
Quote:
Originally Posted by Manyak View Post
Yeah well...same crap
I know. But there's always somebody who will see that and believe it instead of the stickers.
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post #15 of 59
truth is, they're lying
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post #16 of 59
I love how people who don't know what they're talking about come in here and try to act like it's obvious.


Manyak seems like a reputable guy, so I'd go with his explanation.
    
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post #17 of 59
Quote:
Originally Posted by dieanotherday View Post
truth is, they're lying
I don't do this often, but:
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It's a computer!
(18 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveOptical DriveOptical Drive
250 GB Samsung 840 EVO (OS) 3 TB Toshiba P300 (storage) Samsung SH-S243N 24x DVD Burner Samsung SH-S203N 20X DVD Burner 
CoolingOSMonitorKeyboard
Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) Filco Majestouch 104-key Cherry MX Blues w/NKRO 
PowerCaseMouseMouse Pad
Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate Basic, but premium round 
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post #18 of 59
Quote:
Originally Posted by xHassassin View Post
I love how people who don't know what they're talking about come in here and try to act like it's obvious.


Manyak seems like a reputable guy, so I'd go with his explanation.
Everyone wants the preeminence (and the reputation points).
It's a computer!
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i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveOptical DriveOptical Drive
250 GB Samsung 840 EVO (OS) 3 TB Toshiba P300 (storage) Samsung SH-S243N 24x DVD Burner Samsung SH-S203N 20X DVD Burner 
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Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) Filco Majestouch 104-key Cherry MX Blues w/NKRO 
PowerCaseMouseMouse Pad
Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate Basic, but premium round 
AudioAudio
X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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It's a computer!
(18 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveOptical DriveOptical Drive
250 GB Samsung 840 EVO (OS) 3 TB Toshiba P300 (storage) Samsung SH-S243N 24x DVD Burner Samsung SH-S203N 20X DVD Burner 
CoolingOSMonitorKeyboard
Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) Filco Majestouch 104-key Cherry MX Blues w/NKRO 
PowerCaseMouseMouse Pad
Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate Basic, but premium round 
AudioAudio
X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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post #19 of 59
sorry...i wasn't "pretending" to know. but i do believe i figured it out if you'd read my previous post
    
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post #20 of 59
subbed. I have this psu and I wonder if it can really put out that much load.
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A very big SHO
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