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Need a bit of PSU education

post #1 of 5
Thread Starter 
Hi guys,

I need a bit of clarification concerning the 12v rails..... what are these 12v rails exactly ?

I know my way around computers but I just don't get what these rails are exactly, are these the PSU 4 pin power connectors that connect to the motherboard and the video card?
My AMD/ATI build
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CPUMotherboardGraphicsRAM
AMD FX-8350 (4..60Ghz) Gigabyte 990FXA-UD5 XFX R9-290 G.SKILL 8GB DDR3-1600Mhz 7-8-7-24 
Hard DriveOSMonitorPower
OCZ Vertex 2 Windows 7 Home 42 Inch Panasonic 1080p Plasma Antec Truepower 750W 
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My AMD/ATI build
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD FX-8350 (4..60Ghz) Gigabyte 990FXA-UD5 XFX R9-290 G.SKILL 8GB DDR3-1600Mhz 7-8-7-24 
Hard DriveOSMonitorPower
OCZ Vertex 2 Windows 7 Home 42 Inch Panasonic 1080p Plasma Antec Truepower 750W 
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post #2 of 5
Quote:
Originally Posted by thestef View Post
Hi guys,

I need a bit of clarification concerning the 12v rails..... what are these 12v rails exactly ?

I know my way around computers but I just don't get what these rails are exactly, are these the PSU 4 pin power connectors that connect to the motherboard and the video card?
A 12v lines from the PSU are usually yellow. They power the hard drive, optical drive, CPU, graphics card, and the motherboard. Hence, they are important!

Yes, the 2x2 AUX CPU connector is two 12v lines. The 2x3 PCIe plug is 2-3 12v lines.
Once again...
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 [4.28GHz, HT] Asus P6T + Broadcom NetXtreme II VisionTek HD5850 [900/1200] + Galaxy GT240 2x4GB G.Skill Ripjaw X [1632 MHz] 
Hard DriveOSMonitorKeyboard
Intel X25-M 160GB + 3xRAID0 500GB 7200.12 Window 7 Pro 64 Acer H243H + Samsung 226BW XARMOR-U9BL  
PowerCaseMouseMouse Pad
Antec Truepower New 750W Li Lian PC-V2100 [10x120mm fans] Logitech G9 X-Trac Pro 
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Once again...
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 [4.28GHz, HT] Asus P6T + Broadcom NetXtreme II VisionTek HD5850 [900/1200] + Galaxy GT240 2x4GB G.Skill Ripjaw X [1632 MHz] 
Hard DriveOSMonitorKeyboard
Intel X25-M 160GB + 3xRAID0 500GB 7200.12 Window 7 Pro 64 Acer H243H + Samsung 226BW XARMOR-U9BL  
PowerCaseMouseMouse Pad
Antec Truepower New 750W Li Lian PC-V2100 [10x120mm fans] Logitech G9 X-Trac Pro 
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post #3 of 5
Thread Starter 
Ok, so if I understand correctly the 12v rail doesn't reflect on any perticular connection. The 12v Rail is ANY connector which has a 12v yellow wire.
My AMD/ATI build
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD FX-8350 (4..60Ghz) Gigabyte 990FXA-UD5 XFX R9-290 G.SKILL 8GB DDR3-1600Mhz 7-8-7-24 
Hard DriveOSMonitorPower
OCZ Vertex 2 Windows 7 Home 42 Inch Panasonic 1080p Plasma Antec Truepower 750W 
  hide details  
Reply
My AMD/ATI build
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD FX-8350 (4..60Ghz) Gigabyte 990FXA-UD5 XFX R9-290 G.SKILL 8GB DDR3-1600Mhz 7-8-7-24 
Hard DriveOSMonitorPower
OCZ Vertex 2 Windows 7 Home 42 Inch Panasonic 1080p Plasma Antec Truepower 750W 
  hide details  
Reply
post #4 of 5
Quote:
Originally Posted by thestef View Post
Ok, so if I understand correctly the 12v rail doesn't reflect on any perticular connection. The 12v Rail is ANY connector which has a 12v yellow wire.
No.... with multiple rails PSUs, manufactors group different wires together. Sometimes it is the PCIe and CPU AUX on a 12v rail while everything else is on another. It depends on how the PSU is designed.

Here is an example of a 4 rail PSU. Each multiple rail PSU differs on the layout and this is why it is hard to fully utilize all the power from a multiple rail PSU:
Once again...
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 [4.28GHz, HT] Asus P6T + Broadcom NetXtreme II VisionTek HD5850 [900/1200] + Galaxy GT240 2x4GB G.Skill Ripjaw X [1632 MHz] 
Hard DriveOSMonitorKeyboard
Intel X25-M 160GB + 3xRAID0 500GB 7200.12 Window 7 Pro 64 Acer H243H + Samsung 226BW XARMOR-U9BL  
PowerCaseMouseMouse Pad
Antec Truepower New 750W Li Lian PC-V2100 [10x120mm fans] Logitech G9 X-Trac Pro 
  hide details  
Reply
Once again...
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 [4.28GHz, HT] Asus P6T + Broadcom NetXtreme II VisionTek HD5850 [900/1200] + Galaxy GT240 2x4GB G.Skill Ripjaw X [1632 MHz] 
Hard DriveOSMonitorKeyboard
Intel X25-M 160GB + 3xRAID0 500GB 7200.12 Window 7 Pro 64 Acer H243H + Samsung 226BW XARMOR-U9BL  
PowerCaseMouseMouse Pad
Antec Truepower New 750W Li Lian PC-V2100 [10x120mm fans] Logitech G9 X-Trac Pro 
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post #5 of 5
You usually don't want to run everything on one rail. Try to split them up.
Gaming Rig
(14 items)
 
 
CPUMotherboardGraphicsRAM
Intel Core i5-3350P Ivy Bridge 3.1GHz (3.3GHz T... MSI Z77A-G41 LGA 1155 Intel Z77 ZOTAC ZT-61102-10M GeForce GTX 650 Ti 2GB 128-b... G.SKILL Sniper Series16GB (4 x 4GB) 240-Pin DDR... 
Hard DriveOptical DriveCoolingOS
SAMSUNG 840 Series MZ-7TD120BW 2.5" 120GB SATA ... DVD Burner CORSAIR Hydro series H50 High Performance CPU C... Windows 10 Pro 
MonitorKeyboardPowerCase
Dell S2340M IPS Corsair Strafe Thermaltake SMART Series SP-550PCBUS 550W ATX 1... Corsair Vengeance Series C70 Military Green Ste... 
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Logitech M65 RGB Pro Logitech G930 Wireless 
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Gaming Rig
(14 items)
 
 
CPUMotherboardGraphicsRAM
Intel Core i5-3350P Ivy Bridge 3.1GHz (3.3GHz T... MSI Z77A-G41 LGA 1155 Intel Z77 ZOTAC ZT-61102-10M GeForce GTX 650 Ti 2GB 128-b... G.SKILL Sniper Series16GB (4 x 4GB) 240-Pin DDR... 
Hard DriveOptical DriveCoolingOS
SAMSUNG 840 Series MZ-7TD120BW 2.5" 120GB SATA ... DVD Burner CORSAIR Hydro series H50 High Performance CPU C... Windows 10 Pro 
MonitorKeyboardPowerCase
Dell S2340M IPS Corsair Strafe Thermaltake SMART Series SP-550PCBUS 550W ATX 1... Corsair Vengeance Series C70 Military Green Ste... 
MouseAudio
Logitech M65 RGB Pro Logitech G930 Wireless 
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