Overclock.net › Forums › Components › Power Supplies › Benefit of a Single-Rail PSU?
New Posts  All Forums:Forum Nav:

Benefit of a Single-Rail PSU?

post #1 of 32
Thread Starter 
I'm just wondering why everyone seems to prefer single-rail PSUs compared to multi-rail PSUs.
Vapor
(19 items)
 
  
CPUMotherboardGraphicsRAM
Core i5-2500K ASUS P8P67 Pro PNY GeForce GTX 470 G.SKILL Ripjaws X 4GB DDR3-1600 
Hard DriveHard DriveCoolingCooling
Samsung 840 Series Western Digital Caviar Green 1TB (Advanced Format) Swiftech Apogee XT Swiftech MCW80 
CoolingCoolingCoolingOS
XSPC D5 Dual Reservoir Magicool Extreme Dual 120mm Radiator Phobya Xtreme 200mm Radiator Microsoft Windows 8 Pro 
MonitorKeyboardPowerCase
Dell G2410 Logitech K520 OCZ ModXStream Pro 600w Corsair 600T SE 
MouseAudio
Logitech M310 Brainwavz HM3 
  hide details  
Reply
Vapor
(19 items)
 
  
CPUMotherboardGraphicsRAM
Core i5-2500K ASUS P8P67 Pro PNY GeForce GTX 470 G.SKILL Ripjaws X 4GB DDR3-1600 
Hard DriveHard DriveCoolingCooling
Samsung 840 Series Western Digital Caviar Green 1TB (Advanced Format) Swiftech Apogee XT Swiftech MCW80 
CoolingCoolingCoolingOS
XSPC D5 Dual Reservoir Magicool Extreme Dual 120mm Radiator Phobya Xtreme 200mm Radiator Microsoft Windows 8 Pro 
MonitorKeyboardPowerCase
Dell G2410 Logitech K520 OCZ ModXStream Pro 600w Corsair 600T SE 
MouseAudio
Logitech M310 Brainwavz HM3 
  hide details  
Reply
post #2 of 32
In the real-world... nothing.
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 
  hide details  
Reply
post #3 of 32
Multiple rails can cause issues when using Multi GPU configurations.

Basically, you can use only so much of the power from a multi rail PSU. If one rail uses a given amount of power for devices the rest of the power remaining on that rail is unavailable. With a Single Rail design all power is available and isn't wasted.

That's my best way of putting it.
 
X79 Build
(13 items)
 
 
CPUMotherboardGraphicsRAM
Intel Core i7-6950X @ 4.0Ghz Asus Rampage V Extreme [Bios:3101] 2x EVGA GeForce Titan X SC Editions in SLI 32GB (4×8) Corsair Dominator Platinums (3000Mhz) 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 950 Pro 512GB M.2 Nvme 2x 256GB Vertex 4 SSD (RAID-0) 2x 2TB Seagate Barracuda [Storage] Pioneer BDR-207DBK Blu-ray Writer 
CoolingOSMonitorPower
Corsair H105 (Push/Pull) Windows 10 Pro x64 2x 27" Asus PG278Q ROG Swift 144hz  Corsair AX1500i Digital ATX 80 Plus Titanium 
CaseAudio
Lian Li PC-O8WX ATX Cube Case Logitech Z906 5.1 Surround 
CPUMotherboardGraphicsRAM
i7-3930K (C2) @ (4.6Ghz) Asus Rampage IV Extreme X79 (Bios 3204) 3x EVGA GTX780Ti's SC Editions 32GB (4x8GB) G-Skill TridentX 2400Mhz 
Hard DriveHard DriveOptical DriveCooling
2x 256GB OCZ Vertex 4's (RAID-0) 2x 2TB Seagate Barracuda 7200.14 64MB Cache Pioneer BDR-207DBK Blu-ray Writer Corsair H105 (Push/Pull) 
OSMonitorPowerCase
Win7 Pro 64Bit & Win10 Pro 64Bit Asus ROG Swift (2560x1440 @144hz) Corsair AX1200 + Corsair RED sleeved cables Coolermaster Cosmos II Ultra 
  hide details  
Reply
 
X79 Build
(13 items)
 
 
CPUMotherboardGraphicsRAM
Intel Core i7-6950X @ 4.0Ghz Asus Rampage V Extreme [Bios:3101] 2x EVGA GeForce Titan X SC Editions in SLI 32GB (4×8) Corsair Dominator Platinums (3000Mhz) 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 950 Pro 512GB M.2 Nvme 2x 256GB Vertex 4 SSD (RAID-0) 2x 2TB Seagate Barracuda [Storage] Pioneer BDR-207DBK Blu-ray Writer 
CoolingOSMonitorPower
Corsair H105 (Push/Pull) Windows 10 Pro x64 2x 27" Asus PG278Q ROG Swift 144hz  Corsair AX1500i Digital ATX 80 Plus Titanium 
CaseAudio
Lian Li PC-O8WX ATX Cube Case Logitech Z906 5.1 Surround 
CPUMotherboardGraphicsRAM
i7-3930K (C2) @ (4.6Ghz) Asus Rampage IV Extreme X79 (Bios 3204) 3x EVGA GTX780Ti's SC Editions 32GB (4x8GB) G-Skill TridentX 2400Mhz 
Hard DriveHard DriveOptical DriveCooling
2x 256GB OCZ Vertex 4's (RAID-0) 2x 2TB Seagate Barracuda 7200.14 64MB Cache Pioneer BDR-207DBK Blu-ray Writer Corsair H105 (Push/Pull) 
OSMonitorPowerCase
Win7 Pro 64Bit & Win10 Pro 64Bit Asus ROG Swift (2560x1440 @144hz) Corsair AX1200 + Corsair RED sleeved cables Coolermaster Cosmos II Ultra 
  hide details  
Reply
post #4 of 32
Quote:
Originally Posted by Mhill2029 View Post
Multiple rails can cause issues when using Multi GPU configurations.

Basically, you can use only so much of the power from a multi rail PSU. If one rail uses a given amount of power for devices the rest of the power remaining on that rail is unavailable. With a Single Rail design all power is available and isn't wasted.

That's my best way of putting it.


Now, from what I understand, the only thing limiting multi rail PSU's is the OCP. All the current should still be available as long as any one rail doesn't reach its amperage draw limit and click off. That, to me, would be the limiting factor. (as in, 2 GPU's plus assorted other components on one rail will cause it to click off due to excessive amperage and not a lack of power)


edit: Ok, after rereading your post, I think that is what you meant.


edit2: So, single rails usually don't have OCP, so that wouyld be the only reason I can think of as to why thay would not be as good. Lol, I just had a post about this this morning. I think it is easier to understand than it is to explain. (if that makes sense)
Current
(3 items)
 
  
CPUMotherboardGraphics
i5 6600k MSI Z170-A Pro RX-480 
  hide details  
Reply
Current
(3 items)
 
  
CPUMotherboardGraphics
i5 6600k MSI Z170-A Pro RX-480 
  hide details  
Reply
post #5 of 32
Rails are just overcurrent protection. Nothing more.

The only real benefit to HAVING them is that you are sure you aren't overloading any wires in your system. If you run too much current through a thin wire you are asking for trouble (melting the insulation which can cause a short which can blow up your PSU which can burn your house down). But as long as you don't put 500 splitters to the ends of your molex cables, I doubt you will be doing anything that dangerous.

Just make sure that each rail provides enough current for its application and it will be the same as having a single rail.
Server
(11 items)
 
  
CPUMotherboardRAMHard Drive
Intel Core i5-3470 ASRock Z77 Extreme6 16 GB G.Skill Sniper DDR3-1600 1TB WD Caviar Black 
Hard DriveCoolingOSCase
4TB WD Caviar Red Cooler Master Hyper 212+ VMWare ESXi NZXT Crafted Series Tempest 410 
OtherOtherOther
LSI 9280-16i4e RAID Card Intel I350 Quad Port Gigabit NIC Intel Pro/1000 PT Dual Port Gigabit NIC 
  hide details  
Reply
Server
(11 items)
 
  
CPUMotherboardRAMHard Drive
Intel Core i5-3470 ASRock Z77 Extreme6 16 GB G.Skill Sniper DDR3-1600 1TB WD Caviar Black 
Hard DriveCoolingOSCase
4TB WD Caviar Red Cooler Master Hyper 212+ VMWare ESXi NZXT Crafted Series Tempest 410 
OtherOtherOther
LSI 9280-16i4e RAID Card Intel I350 Quad Port Gigabit NIC Intel Pro/1000 PT Dual Port Gigabit NIC 
  hide details  
Reply
post #6 of 32
Quote:
Originally Posted by Mhill2029 View Post
Multiple rails can cause issues when using Multi GPU configurations.

Basically, you can use only so much of the power from a multi rail PSU. If one rail uses a given amount of power for devices the rest of the power remaining on that rail is unavailable. With a Single Rail design all power is available and isn't wasted.

That's my best way of putting it.
When was the last time (or first time) that you heard of a system where OCP shutdown a PSU due to rail layout?
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 
  hide details  
Reply
post #7 of 32
Quote:
Originally Posted by DuckieHo View Post
When was the last time (or first time) that you heard of a system where OCP shutdown a PSU due to rail layout?
Cognoscenti had the problem herself, she constantly got system shutdowns due to overloading a given rail.
 
X79 Build
(13 items)
 
 
CPUMotherboardGraphicsRAM
Intel Core i7-6950X @ 4.0Ghz Asus Rampage V Extreme [Bios:3101] 2x EVGA GeForce Titan X SC Editions in SLI 32GB (4×8) Corsair Dominator Platinums (3000Mhz) 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 950 Pro 512GB M.2 Nvme 2x 256GB Vertex 4 SSD (RAID-0) 2x 2TB Seagate Barracuda [Storage] Pioneer BDR-207DBK Blu-ray Writer 
CoolingOSMonitorPower
Corsair H105 (Push/Pull) Windows 10 Pro x64 2x 27" Asus PG278Q ROG Swift 144hz  Corsair AX1500i Digital ATX 80 Plus Titanium 
CaseAudio
Lian Li PC-O8WX ATX Cube Case Logitech Z906 5.1 Surround 
CPUMotherboardGraphicsRAM
i7-3930K (C2) @ (4.6Ghz) Asus Rampage IV Extreme X79 (Bios 3204) 3x EVGA GTX780Ti's SC Editions 32GB (4x8GB) G-Skill TridentX 2400Mhz 
Hard DriveHard DriveOptical DriveCooling
2x 256GB OCZ Vertex 4's (RAID-0) 2x 2TB Seagate Barracuda 7200.14 64MB Cache Pioneer BDR-207DBK Blu-ray Writer Corsair H105 (Push/Pull) 
OSMonitorPowerCase
Win7 Pro 64Bit & Win10 Pro 64Bit Asus ROG Swift (2560x1440 @144hz) Corsair AX1200 + Corsair RED sleeved cables Coolermaster Cosmos II Ultra 
  hide details  
Reply
 
X79 Build
(13 items)
 
 
CPUMotherboardGraphicsRAM
Intel Core i7-6950X @ 4.0Ghz Asus Rampage V Extreme [Bios:3101] 2x EVGA GeForce Titan X SC Editions in SLI 32GB (4×8) Corsair Dominator Platinums (3000Mhz) 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 950 Pro 512GB M.2 Nvme 2x 256GB Vertex 4 SSD (RAID-0) 2x 2TB Seagate Barracuda [Storage] Pioneer BDR-207DBK Blu-ray Writer 
CoolingOSMonitorPower
Corsair H105 (Push/Pull) Windows 10 Pro x64 2x 27" Asus PG278Q ROG Swift 144hz  Corsair AX1500i Digital ATX 80 Plus Titanium 
CaseAudio
Lian Li PC-O8WX ATX Cube Case Logitech Z906 5.1 Surround 
CPUMotherboardGraphicsRAM
i7-3930K (C2) @ (4.6Ghz) Asus Rampage IV Extreme X79 (Bios 3204) 3x EVGA GTX780Ti's SC Editions 32GB (4x8GB) G-Skill TridentX 2400Mhz 
Hard DriveHard DriveOptical DriveCooling
2x 256GB OCZ Vertex 4's (RAID-0) 2x 2TB Seagate Barracuda 7200.14 64MB Cache Pioneer BDR-207DBK Blu-ray Writer Corsair H105 (Push/Pull) 
OSMonitorPowerCase
Win7 Pro 64Bit & Win10 Pro 64Bit Asus ROG Swift (2560x1440 @144hz) Corsair AX1200 + Corsair RED sleeved cables Coolermaster Cosmos II Ultra 
  hide details  
Reply
post #8 of 32
Thread Starter 
The PSU I'm planning to get is Silverstone 1200w ST1200. I believe it has about 95A on 5 rails. Don't plan on doing SLI because I'm upgrading video cards about once every year.
Vapor
(19 items)
 
  
CPUMotherboardGraphicsRAM
Core i5-2500K ASUS P8P67 Pro PNY GeForce GTX 470 G.SKILL Ripjaws X 4GB DDR3-1600 
Hard DriveHard DriveCoolingCooling
Samsung 840 Series Western Digital Caviar Green 1TB (Advanced Format) Swiftech Apogee XT Swiftech MCW80 
CoolingCoolingCoolingOS
XSPC D5 Dual Reservoir Magicool Extreme Dual 120mm Radiator Phobya Xtreme 200mm Radiator Microsoft Windows 8 Pro 
MonitorKeyboardPowerCase
Dell G2410 Logitech K520 OCZ ModXStream Pro 600w Corsair 600T SE 
MouseAudio
Logitech M310 Brainwavz HM3 
  hide details  
Reply
Vapor
(19 items)
 
  
CPUMotherboardGraphicsRAM
Core i5-2500K ASUS P8P67 Pro PNY GeForce GTX 470 G.SKILL Ripjaws X 4GB DDR3-1600 
Hard DriveHard DriveCoolingCooling
Samsung 840 Series Western Digital Caviar Green 1TB (Advanced Format) Swiftech Apogee XT Swiftech MCW80 
CoolingCoolingCoolingOS
XSPC D5 Dual Reservoir Magicool Extreme Dual 120mm Radiator Phobya Xtreme 200mm Radiator Microsoft Windows 8 Pro 
MonitorKeyboardPowerCase
Dell G2410 Logitech K520 OCZ ModXStream Pro 600w Corsair 600T SE 
MouseAudio
Logitech M310 Brainwavz HM3 
  hide details  
Reply
post #9 of 32
Quote:
Originally Posted by dM@n View Post
The PSU I'm planning to get is Silverstone 1200w ST1200. I believe it has about 95A on 5 rails. Don't plan on doing SLI because I'm upgrading video cards about once every year.
That is a god damn expensive PSU.
 
X79 Build
(13 items)
 
 
CPUMotherboardGraphicsRAM
Intel Core i7-6950X @ 4.0Ghz Asus Rampage V Extreme [Bios:3101] 2x EVGA GeForce Titan X SC Editions in SLI 32GB (4×8) Corsair Dominator Platinums (3000Mhz) 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 950 Pro 512GB M.2 Nvme 2x 256GB Vertex 4 SSD (RAID-0) 2x 2TB Seagate Barracuda [Storage] Pioneer BDR-207DBK Blu-ray Writer 
CoolingOSMonitorPower
Corsair H105 (Push/Pull) Windows 10 Pro x64 2x 27" Asus PG278Q ROG Swift 144hz  Corsair AX1500i Digital ATX 80 Plus Titanium 
CaseAudio
Lian Li PC-O8WX ATX Cube Case Logitech Z906 5.1 Surround 
CPUMotherboardGraphicsRAM
i7-3930K (C2) @ (4.6Ghz) Asus Rampage IV Extreme X79 (Bios 3204) 3x EVGA GTX780Ti's SC Editions 32GB (4x8GB) G-Skill TridentX 2400Mhz 
Hard DriveHard DriveOptical DriveCooling
2x 256GB OCZ Vertex 4's (RAID-0) 2x 2TB Seagate Barracuda 7200.14 64MB Cache Pioneer BDR-207DBK Blu-ray Writer Corsair H105 (Push/Pull) 
OSMonitorPowerCase
Win7 Pro 64Bit & Win10 Pro 64Bit Asus ROG Swift (2560x1440 @144hz) Corsair AX1200 + Corsair RED sleeved cables Coolermaster Cosmos II Ultra 
  hide details  
Reply
 
X79 Build
(13 items)
 
 
CPUMotherboardGraphicsRAM
Intel Core i7-6950X @ 4.0Ghz Asus Rampage V Extreme [Bios:3101] 2x EVGA GeForce Titan X SC Editions in SLI 32GB (4×8) Corsair Dominator Platinums (3000Mhz) 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 950 Pro 512GB M.2 Nvme 2x 256GB Vertex 4 SSD (RAID-0) 2x 2TB Seagate Barracuda [Storage] Pioneer BDR-207DBK Blu-ray Writer 
CoolingOSMonitorPower
Corsair H105 (Push/Pull) Windows 10 Pro x64 2x 27" Asus PG278Q ROG Swift 144hz  Corsair AX1500i Digital ATX 80 Plus Titanium 
CaseAudio
Lian Li PC-O8WX ATX Cube Case Logitech Z906 5.1 Surround 
CPUMotherboardGraphicsRAM
i7-3930K (C2) @ (4.6Ghz) Asus Rampage IV Extreme X79 (Bios 3204) 3x EVGA GTX780Ti's SC Editions 32GB (4x8GB) G-Skill TridentX 2400Mhz 
Hard DriveHard DriveOptical DriveCooling
2x 256GB OCZ Vertex 4's (RAID-0) 2x 2TB Seagate Barracuda 7200.14 64MB Cache Pioneer BDR-207DBK Blu-ray Writer Corsair H105 (Push/Pull) 
OSMonitorPowerCase
Win7 Pro 64Bit & Win10 Pro 64Bit Asus ROG Swift (2560x1440 @144hz) Corsair AX1200 + Corsair RED sleeved cables Coolermaster Cosmos II Ultra 
  hide details  
Reply
post #10 of 32
Thread Starter 
It's only 300 USD on Newegg.
Vapor
(19 items)
 
  
CPUMotherboardGraphicsRAM
Core i5-2500K ASUS P8P67 Pro PNY GeForce GTX 470 G.SKILL Ripjaws X 4GB DDR3-1600 
Hard DriveHard DriveCoolingCooling
Samsung 840 Series Western Digital Caviar Green 1TB (Advanced Format) Swiftech Apogee XT Swiftech MCW80 
CoolingCoolingCoolingOS
XSPC D5 Dual Reservoir Magicool Extreme Dual 120mm Radiator Phobya Xtreme 200mm Radiator Microsoft Windows 8 Pro 
MonitorKeyboardPowerCase
Dell G2410 Logitech K520 OCZ ModXStream Pro 600w Corsair 600T SE 
MouseAudio
Logitech M310 Brainwavz HM3 
  hide details  
Reply
Vapor
(19 items)
 
  
CPUMotherboardGraphicsRAM
Core i5-2500K ASUS P8P67 Pro PNY GeForce GTX 470 G.SKILL Ripjaws X 4GB DDR3-1600 
Hard DriveHard DriveCoolingCooling
Samsung 840 Series Western Digital Caviar Green 1TB (Advanced Format) Swiftech Apogee XT Swiftech MCW80 
CoolingCoolingCoolingOS
XSPC D5 Dual Reservoir Magicool Extreme Dual 120mm Radiator Phobya Xtreme 200mm Radiator Microsoft Windows 8 Pro 
MonitorKeyboardPowerCase
Dell G2410 Logitech K520 OCZ ModXStream Pro 600w Corsair 600T SE 
MouseAudio
Logitech M310 Brainwavz HM3 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Power Supplies
Overclock.net › Forums › Components › Power Supplies › Benefit of a Single-Rail PSU?