Overclock.net › Forums › Components › Power Supplies › What uses -5 Volt in PC
New Posts  All Forums:Forum Nav:

What uses -5 Volt in PC

post #1 of 16
Thread Starter 
Hi

I have noticed in CPUID HWMonitor that -5 voltage is not stable at all.
It goes to up -0.5V to down -5V.

I took out the PSU and tested it.
Without load all voltages are stable.
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core 2 Duo E6300 @ 1866MHz Gigabyte 965P-S3 NVIDIA GeForce 7900 GTX 2 x 1024 DDR2-SDRAM PC2-5300 (333MHz) - DDR2-666 
Hard DrivePower
SAMSUNG HD322HJ (320GB) 500 W 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core 2 Duo E6300 @ 1866MHz Gigabyte 965P-S3 NVIDIA GeForce 7900 GTX 2 x 1024 DDR2-SDRAM PC2-5300 (333MHz) - DDR2-666 
Hard DrivePower
SAMSUNG HD322HJ (320GB) 500 W 
  hide details  
Reply
post #2 of 16
Quote:
Originally Posted by maik281 View Post

Hi
I have noticed in CPUID HWMonitor that -5 voltage is not stable at all.
It goes to up -0.5V to down -5V.
I took out the PSU and tested it.
Without load all voltages are stable.

I don't think that software voltage monitors are trustworthy at all. If the manual testings are in spec, then you should be good.
Parental Advisory
(14 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k: 4.5GHz @ 1.325 Asus Sabertooth P67 EVGA Superclocked 560Ti Corsair XMS3 2x2GB 1600MHz 
Hard DriveOptical DriveCoolingOS
WD Caviar Black 500GB x2 in RAID0 Lite-on 24x DVD Burner XSPC RX240 Kit Windows 7 Professional 
MonitorKeyboardPowerCase
Acer 21.5" S211HLBD Sidewinder x6 Corsair HX750 HAF 922 
MouseMouse Pad
Razer Mamba Cheap-o from Office Depot FTW! 
  hide details  
Reply
Parental Advisory
(14 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k: 4.5GHz @ 1.325 Asus Sabertooth P67 EVGA Superclocked 560Ti Corsair XMS3 2x2GB 1600MHz 
Hard DriveOptical DriveCoolingOS
WD Caviar Black 500GB x2 in RAID0 Lite-on 24x DVD Burner XSPC RX240 Kit Windows 7 Professional 
MonitorKeyboardPowerCase
Acer 21.5" S211HLBD Sidewinder x6 Corsair HX750 HAF 922 
MouseMouse Pad
Razer Mamba Cheap-o from Office Depot FTW! 
  hide details  
Reply
post #3 of 16
The -5V was taken out of the ATX spec years ago. Modern PSUs should not have it, and modern computers do not use it. But like the other person said, software-based voltage monitoring is crap and you should not pay attention to it.
post #4 of 16
-5V was removed from the ATX spec in 2003. It's actually forbidden in modern PSUs. However some motherboards still have sensors for the -5V because floobie flarpie gwah. And since that sensor doesn't have a proper voltage input and may even get feedback voltage from further along the circuit, you get nonsensical readings.
post #5 of 16
Quote:
Originally Posted by Phaedrus2129 View Post

However some motherboards still have sensors for the -5V because floobie flarpie gwah.
I'd like to learn more. Perhaps you could PM me details. wink.gif
 
Reginald
(14 items)
 
GLaDOS (v3)
(12 items)
 
CPUMotherboardGraphicsGraphics
i7-970 @ 4.14GHz 1.350v P6T7 WS Supercomputer MSI 7970 GHz Edition HIS 6950 
RAMHard DriveHard DriveCooling
48GB Crucial Ballistix @1660MHz 9-9-9-27 Momentus XT intel 480GB 520 series INX-720 
OSMonitorMonitorMonitor
win7pro Soyo P-MVA 1200p 24" Dell 24" 1200p Dell 17" 4:3 (market tickers) 
KeyboardPowerCaseMouse
Dell Quietkey AX850 PC-Z60 Logitech G5 
CPUMotherboardGraphicsRAM
Q6700 @ 3.0 (stock volts) ASUS P5WDG2-WS PRO HIS 6950 2GB turbo (unlocked) 8GB DDR2 800 
Hard DriveOptical DriveOSMonitor
9550SX w/BBU + 4x 250GB 7.2k Raid 5 HL-DT-ST DVDRW GSA-H30L Kali Linux VNC (TC Rig, baby) 
KeyboardPowerCaseMouse
Dell QuietKey (PS2) Truepower Trio 650 Koolance PC3-420SL Logitech G5 
  hide details  
Reply
 
Reginald
(14 items)
 
GLaDOS (v3)
(12 items)
 
CPUMotherboardGraphicsGraphics
i7-970 @ 4.14GHz 1.350v P6T7 WS Supercomputer MSI 7970 GHz Edition HIS 6950 
RAMHard DriveHard DriveCooling
48GB Crucial Ballistix @1660MHz 9-9-9-27 Momentus XT intel 480GB 520 series INX-720 
OSMonitorMonitorMonitor
win7pro Soyo P-MVA 1200p 24" Dell 24" 1200p Dell 17" 4:3 (market tickers) 
KeyboardPowerCaseMouse
Dell Quietkey AX850 PC-Z60 Logitech G5 
CPUMotherboardGraphicsRAM
Q6700 @ 3.0 (stock volts) ASUS P5WDG2-WS PRO HIS 6950 2GB turbo (unlocked) 8GB DDR2 800 
Hard DriveOptical DriveOSMonitor
9550SX w/BBU + 4x 250GB 7.2k Raid 5 HL-DT-ST DVDRW GSA-H30L Kali Linux VNC (TC Rig, baby) 
KeyboardPowerCaseMouse
Dell QuietKey (PS2) Truepower Trio 650 Koolance PC3-420SL Logitech G5 
  hide details  
Reply
post #6 of 16
Quote:
Originally Posted by Phaedrus2129 View Post

However some motherboards still have sensors for the -5V because floobie flarpie gwah.

Please tell us more.
    
CPUMotherboardGraphicsRAM
Core i7 920 4ghz 1.25v Evga Classified E760/E762 Evga Gtx 480 + Galaxy GTX 480 SLI 6GB Corsair Dominator GT 1600mhz 
Hard DriveOSMonitorKeyboard
Crucial C300 256Gb, Samsung 7200rpm 320gb, 2x W... Windows 7 64-bit Home premium Dell U2410 1920x1200 Wireless Logitech 
PowerCaseMouseMouse Pad
Antec Quatro 1200w Corsair 800D Razer Death Adder Office Depot thingy 
AudioAudio
Asus Xonar STX Sennheiser HD555's 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Core i7 920 4ghz 1.25v Evga Classified E760/E762 Evga Gtx 480 + Galaxy GTX 480 SLI 6GB Corsair Dominator GT 1600mhz 
Hard DriveOSMonitorKeyboard
Crucial C300 256Gb, Samsung 7200rpm 320gb, 2x W... Windows 7 64-bit Home premium Dell U2410 1920x1200 Wireless Logitech 
PowerCaseMouseMouse Pad
Antec Quatro 1200w Corsair 800D Razer Death Adder Office Depot thingy 
AudioAudio
Asus Xonar STX Sennheiser HD555's 
  hide details  
Reply
post #7 of 16
I'm interested in the "floobie flarpie gwah". Do share.
Parental Advisory
(14 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k: 4.5GHz @ 1.325 Asus Sabertooth P67 EVGA Superclocked 560Ti Corsair XMS3 2x2GB 1600MHz 
Hard DriveOptical DriveCoolingOS
WD Caviar Black 500GB x2 in RAID0 Lite-on 24x DVD Burner XSPC RX240 Kit Windows 7 Professional 
MonitorKeyboardPowerCase
Acer 21.5" S211HLBD Sidewinder x6 Corsair HX750 HAF 922 
MouseMouse Pad
Razer Mamba Cheap-o from Office Depot FTW! 
  hide details  
Reply
Parental Advisory
(14 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k: 4.5GHz @ 1.325 Asus Sabertooth P67 EVGA Superclocked 560Ti Corsair XMS3 2x2GB 1600MHz 
Hard DriveOptical DriveCoolingOS
WD Caviar Black 500GB x2 in RAID0 Lite-on 24x DVD Burner XSPC RX240 Kit Windows 7 Professional 
MonitorKeyboardPowerCase
Acer 21.5" S211HLBD Sidewinder x6 Corsair HX750 HAF 922 
MouseMouse Pad
Razer Mamba Cheap-o from Office Depot FTW! 
  hide details  
Reply
post #8 of 16
You just like making my life difficult. tongue.gif

Because some motherboard manufacturers are cheap and lazy and would rather keep using the same sense ICs they've been using since 1995 than design new ones or pay $0.0015 more per board for third party ones.
post #9 of 16
Quote:
Originally Posted by Phaedrus2129 View Post

You just like making my life difficult. tongue.gif
Because some motherboard manufacturers are cheap and lazy and would rather keep using the same sense ICs they've been using since 1995 than design new ones or pay $0.0015 more per board for third party ones.

So I guess there is no disadvantage to removing the -5V rail?
Parental Advisory
(14 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k: 4.5GHz @ 1.325 Asus Sabertooth P67 EVGA Superclocked 560Ti Corsair XMS3 2x2GB 1600MHz 
Hard DriveOptical DriveCoolingOS
WD Caviar Black 500GB x2 in RAID0 Lite-on 24x DVD Burner XSPC RX240 Kit Windows 7 Professional 
MonitorKeyboardPowerCase
Acer 21.5" S211HLBD Sidewinder x6 Corsair HX750 HAF 922 
MouseMouse Pad
Razer Mamba Cheap-o from Office Depot FTW! 
  hide details  
Reply
Parental Advisory
(14 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k: 4.5GHz @ 1.325 Asus Sabertooth P67 EVGA Superclocked 560Ti Corsair XMS3 2x2GB 1600MHz 
Hard DriveOptical DriveCoolingOS
WD Caviar Black 500GB x2 in RAID0 Lite-on 24x DVD Burner XSPC RX240 Kit Windows 7 Professional 
MonitorKeyboardPowerCase
Acer 21.5" S211HLBD Sidewinder x6 Corsair HX750 HAF 922 
MouseMouse Pad
Razer Mamba Cheap-o from Office Depot FTW! 
  hide details  
Reply
post #10 of 16
As previously mentioned, not only is there no advantage to it, but having it violates spec.
Quote:
Originally Posted by Phaedrus2129 View Post

You just like making my life difficult. tongue.gif
who, me?
 
Reginald
(14 items)
 
GLaDOS (v3)
(12 items)
 
CPUMotherboardGraphicsGraphics
i7-970 @ 4.14GHz 1.350v P6T7 WS Supercomputer MSI 7970 GHz Edition HIS 6950 
RAMHard DriveHard DriveCooling
48GB Crucial Ballistix @1660MHz 9-9-9-27 Momentus XT intel 480GB 520 series INX-720 
OSMonitorMonitorMonitor
win7pro Soyo P-MVA 1200p 24" Dell 24" 1200p Dell 17" 4:3 (market tickers) 
KeyboardPowerCaseMouse
Dell Quietkey AX850 PC-Z60 Logitech G5 
CPUMotherboardGraphicsRAM
Q6700 @ 3.0 (stock volts) ASUS P5WDG2-WS PRO HIS 6950 2GB turbo (unlocked) 8GB DDR2 800 
Hard DriveOptical DriveOSMonitor
9550SX w/BBU + 4x 250GB 7.2k Raid 5 HL-DT-ST DVDRW GSA-H30L Kali Linux VNC (TC Rig, baby) 
KeyboardPowerCaseMouse
Dell QuietKey (PS2) Truepower Trio 650 Koolance PC3-420SL Logitech G5 
  hide details  
Reply
 
Reginald
(14 items)
 
GLaDOS (v3)
(12 items)
 
CPUMotherboardGraphicsGraphics
i7-970 @ 4.14GHz 1.350v P6T7 WS Supercomputer MSI 7970 GHz Edition HIS 6950 
RAMHard DriveHard DriveCooling
48GB Crucial Ballistix @1660MHz 9-9-9-27 Momentus XT intel 480GB 520 series INX-720 
OSMonitorMonitorMonitor
win7pro Soyo P-MVA 1200p 24" Dell 24" 1200p Dell 17" 4:3 (market tickers) 
KeyboardPowerCaseMouse
Dell Quietkey AX850 PC-Z60 Logitech G5 
CPUMotherboardGraphicsRAM
Q6700 @ 3.0 (stock volts) ASUS P5WDG2-WS PRO HIS 6950 2GB turbo (unlocked) 8GB DDR2 800 
Hard DriveOptical DriveOSMonitor
9550SX w/BBU + 4x 250GB 7.2k Raid 5 HL-DT-ST DVDRW GSA-H30L Kali Linux VNC (TC Rig, baby) 
KeyboardPowerCaseMouse
Dell QuietKey (PS2) Truepower Trio 650 Koolance PC3-420SL Logitech G5 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Power Supplies
Overclock.net › Forums › Components › Power Supplies › What uses -5 Volt in PC