Overclock.net › Forums › Industry News › Hardware News › Combining 12V rails to one 12V rail on PSUs
New Posts  All Forums:Forum Nav:

Combining 12V rails to one 12V rail on PSUs

post #1 of 21
Thread Starter 
http://anandtech.com/casecoolingpsus...spx?i=3037&p=7

Quote:
On the lower right edge of the PCB we found a small switch. This switch is actually to turn off the OCP on each of the four 12v rails to "combine" them into a single one. This is a very common method as most other manufacturers approach rail separation the exact same way. Normally separated 12v rails can be generated with just these separated OCPs on each rail. They have one or two 12v rails and just split them into a few more in order to show a higher number of 12v rails.



Not sure if there is a benefit to combining the rails, but apparently it can be done on a lot of other PSUs as well.

    
CPUMotherboardGraphicsRAM
X2 5000+ BE Gigabyte GA-MA78GM-S2H AM2+ Integrated HD3200 2x2GB OCZ DDR2 
Hard DriveMonitorPowerCase
Maxtor 40GB Samsung 2220WM 22" Antec Neo HE 550W Ultra Wizard 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
X2 5000+ BE Gigabyte GA-MA78GM-S2H AM2+ Integrated HD3200 2x2GB OCZ DDR2 
Hard DriveMonitorPowerCase
Maxtor 40GB Samsung 2220WM 22" Antec Neo HE 550W Ultra Wizard 
  hide details  
Reply
post #2 of 21
You should get a higher effeciency with lower number of rails...(I think)
Monster Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q6600 G0 P5K Deluxe 3870 2X1GB Geil 800 MHz 
Hard DriveOptical DriveOSMonitor
4 x 250 barracuda's 2 x DVD Writers Windows 7 22" Acer LCD 
KeyboardPowerCaseMouse
Razor 600W GameXStream TT Armor Modded Razor 
  hide details  
Reply
Monster Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q6600 G0 P5K Deluxe 3870 2X1GB Geil 800 MHz 
Hard DriveOptical DriveOSMonitor
4 x 250 barracuda's 2 x DVD Writers Windows 7 22" Acer LCD 
KeyboardPowerCaseMouse
Razor 600W GameXStream TT Armor Modded Razor 
  hide details  
Reply
post #3 of 21
It depends on how the PSU is designed really.

For instance, if you have a "dual" rail PSU that is actually one rail split as mentioned in the OP, which can provide a maximum of 18A on each rail, but is internally limited to provide lower than that combining the rails would allow you to unlock all of the available power.
    
CPUMotherboardGraphicsRAM
i7 3770k ASUS P8Z77I Deluxe EVGA GTX 980 FTW 8GB Team Xtreem 
Hard DriveCoolingOSMonitor
Samsung 840 EVO All water... Win7 Ultimate Korean 27" 1440p 
PowerCaseAudio
Silverstone SX600-G Ncase M1 ALC898 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
i7 3770k ASUS P8Z77I Deluxe EVGA GTX 980 FTW 8GB Team Xtreem 
Hard DriveCoolingOSMonitor
Samsung 840 EVO All water... Win7 Ultimate Korean 27" 1440p 
PowerCaseAudio
Silverstone SX600-G Ncase M1 ALC898 
  hide details  
Reply
post #4 of 21
I must say, Anandtech has a very good PSU test methodology. Props to them.
Optimus Prime
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q6600 G0 Gigabyte P35-DS3R eVGA 8800GTS 650/2000 2x2GB G. Skill DDR2 1000 
Hard DriveOptical DriveOSMonitor
7200.10 RAID0 (640GB) Pioneer DVD +/- RW Vista Ultimate x64 Acer 22" WS + 17" LCD 
KeyboardPowerCaseMouse
Logitech G15 Silverstone OP 650 Modified P180 for W/C Razer Death Adder 
Mouse Pad
Razer Mantis Speed 
  hide details  
Reply
Optimus Prime
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q6600 G0 Gigabyte P35-DS3R eVGA 8800GTS 650/2000 2x2GB G. Skill DDR2 1000 
Hard DriveOptical DriveOSMonitor
7200.10 RAID0 (640GB) Pioneer DVD +/- RW Vista Ultimate x64 Acer 22" WS + 17" LCD 
KeyboardPowerCaseMouse
Logitech G15 Silverstone OP 650 Modified P180 for W/C Razer Death Adder 
Mouse Pad
Razer Mantis Speed 
  hide details  
Reply
post #5 of 21
When you do this, remember to tell how long your components last. You may need a stopwatch.
System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Core i7 2500k ASRock P67 Extreme4 Gen 3 AMD 7970 16GB DDR3 
Hard DriveOptical DriveOSMonitor
Intel 520 256GB SATA DVD Burner Windows 7 64 bit Deal U2410 
KeyboardPowerMouse
Adesso Mechanical Silverstone OP650 Logitech G700 
  hide details  
Reply
System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Core i7 2500k ASRock P67 Extreme4 Gen 3 AMD 7970 16GB DDR3 
Hard DriveOptical DriveOSMonitor
Intel 520 256GB SATA DVD Burner Windows 7 64 bit Deal U2410 
KeyboardPowerMouse
Adesso Mechanical Silverstone OP650 Logitech G700 
  hide details  
Reply
post #6 of 21
Quote:
Originally Posted by Whodie View Post
It depends on how the PSU is designed really.

For instance, if you have a "dual" rail PSU that is actually one rail split as mentioned in the OP, which can provide a maximum of 18A on each rail, but is internally limited to provide lower than that combining the rails would allow you to unlock all of the available power.
Another reason to make sure your getting a good PSU.
Lee XT
(17 items)
 
  
CPUMotherboardGraphicsRAM
AMD FX-6300 Asus M5A97 SAPPHIRE Radeon HD 7850 AMD 4GB DDR3 1333MHZ 
RAMRAMRAMHard Drive
AMD 4GB DDR3 1333MHZ AMD 4GB DDR3 1333MHZ AMD 4GB DDR3 1333MHZ OCZ Vertex 4 256GB 
CoolingOSMonitorKeyboard
Corsair H80 Windows 8.1 Pro MCE Dell P2414H WHXV7  Microsoft Generic 
PowerCaseMouseMouse Pad
Ultra 600W Limited Edition NZXT Black Steel Razer Deathadder Razer Goliath 
Audio
Realtek HD Audio 
  hide details  
Reply
Lee XT
(17 items)
 
  
CPUMotherboardGraphicsRAM
AMD FX-6300 Asus M5A97 SAPPHIRE Radeon HD 7850 AMD 4GB DDR3 1333MHZ 
RAMRAMRAMHard Drive
AMD 4GB DDR3 1333MHZ AMD 4GB DDR3 1333MHZ AMD 4GB DDR3 1333MHZ OCZ Vertex 4 256GB 
CoolingOSMonitorKeyboard
Corsair H80 Windows 8.1 Pro MCE Dell P2414H WHXV7  Microsoft Generic 
PowerCaseMouseMouse Pad
Ultra 600W Limited Edition NZXT Black Steel Razer Deathadder Razer Goliath 
Audio
Realtek HD Audio 
  hide details  
Reply
post #7 of 21
I wouldn't risk it, it voids warranty and alters the PSU..
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Pentium G3258 ASRock Z97 Extreme6 Integrated G.SKILL Ripjaws X Series 8GB 
Hard DriveOSKeyboardPower
SAMSUNG 850 EVO-Series Windows 7 Ultimate Microsoft Serial Mouse CORSAIR CX series CX500 
MouseMouse Pad
Intel Treasure Trooper 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Pentium G3258 ASRock Z97 Extreme6 Integrated G.SKILL Ripjaws X Series 8GB 
Hard DriveOSKeyboardPower
SAMSUNG 850 EVO-Series Windows 7 Ultimate Microsoft Serial Mouse CORSAIR CX series CX500 
MouseMouse Pad
Intel Treasure Trooper 
  hide details  
Reply
post #8 of 21
Buy a single rail....
post #9 of 21
Quote:
Originally Posted by pauldovi View Post
When you do this, remember to tell how long your components last. You may need a stopwatch.
I admit I didn't read the whole article but why would your components fail from combining multiple rails into one?
compy jr
(13 items)
 
  
CPUMotherboardGraphicsHard Drive
xeon 3350 at 3.6ghz Asus P5k-dlx HIS 7970 @ 1150/1900 Lots of them.  
OSMonitorKeyboardPower
vista ultimate x64/xp sp3 compaq 21" junk dell keyboard corsair tx850m 
CaseMouseMouse Pad
upgraded metal box You don't need a mouse Desk 
  hide details  
Reply
compy jr
(13 items)
 
  
CPUMotherboardGraphicsHard Drive
xeon 3350 at 3.6ghz Asus P5k-dlx HIS 7970 @ 1150/1900 Lots of them.  
OSMonitorKeyboardPower
vista ultimate x64/xp sp3 compaq 21" junk dell keyboard corsair tx850m 
CaseMouseMouse Pad
upgraded metal box You don't need a mouse Desk 
  hide details  
Reply
post #10 of 21
The whole thing with the "multiple rails" done with the op thing is a marketing gimmick at this point. It's really better for a high end system to have a single rail with high amps instead of several fake fails with amp limiters on each one. If one rail is drawing 4 amps and the other is drawing 20amps and the psu can handle say 36 amps then it will still trip the protection and crash on you even though you have a ton of amps left. Switch it off and all that will happen is you will remove this artificial amp limit and it will load balance better. Blame this crap on ATX2.2 and marketing douches.
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 3570k ASRock Z77 Extreme6 EVGA GTX 980ti Superclock 4x4GB Samsung 1600mhz 
Hard DriveHard DriveCoolingOS
Samsung SSD840 2xMaxtor 200gb RAID0 Customer water cooling with '77 Bonneville rad Windows 10 Professional 
MonitorKeyboardPowerCase
27" Korean 1440p Razor mechanical Corsair TH850W CM Stacker 810 
MouseMouse Pad
Razor Lachesis generic 
  hide details  
Reply
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 3570k ASRock Z77 Extreme6 EVGA GTX 980ti Superclock 4x4GB Samsung 1600mhz 
Hard DriveHard DriveCoolingOS
Samsung SSD840 2xMaxtor 200gb RAID0 Customer water cooling with '77 Bonneville rad Windows 10 Professional 
MonitorKeyboardPowerCase
27" Korean 1440p Razor mechanical Corsair TH850W CM Stacker 810 
MouseMouse Pad
Razor Lachesis generic 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Hardware News
Overclock.net › Forums › Industry News › Hardware News › Combining 12V rails to one 12V rail on PSUs