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Question for making 8pin mobo cable.

post #1 of 4
Thread Starter 
I have a modular PSU that does not have an 8pin connector for the CPU power. I have been using a 4pin and the computer has been running ok.

Is it important that I have the 8pin to OC?

I got an adapter, but the computer wouldn't boot with it plugged in. I assume it has something to do with the fact that cable coming from the PSU had 1yellow 2 black and 1 red while the 8pin is supposed to be 4 ground and 4 12v. Maybe I am wrong? Is the red wire a different voltage?

Is there a way to cut and solder 2 cables that will work? Any advice?
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CPUMotherboardGraphicsRAM
Phenom II x4 945 Gigabyte GA-790A-UD3 MSI GTX 460 Hawk Kingston 4gb DDR3 1866mhz 
Hard DriveOptical DriveOSMonitor
1tb Sata Plextor px-88osa Win 7 64bit NEC AccuSync LCD193wxm 
PowerCaseMouse
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II x4 945 Gigabyte GA-790A-UD3 MSI GTX 460 Hawk Kingston 4gb DDR3 1866mhz 
Hard DriveOptical DriveOSMonitor
1tb Sata Plextor px-88osa Win 7 64bit NEC AccuSync LCD193wxm 
PowerCaseMouse
Hiper 580W Modular Cooler Master Elite Logitech mx518 
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post #2 of 4
You're perfectly fine. You only need a 4-pin power adapter.

If you're doing heavy overclocking you might see a small stability difference.
    
CPUGraphicsGraphicsRAM
Intel i7 3630QM HD 7970M HD 7970M 2x4GB 1333MHz 
Hard DriveHard DriveHard DriveOptical Drive
Crucial M4 256GB mSata Seagate Momentus 750GB Western Digital Scorpio Blue 500GB DVD Burner 
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Windows 7 64-Bit Ultimate 17.3" 1920x1080 Matte Screen Auria 27" 2560x1440 Back-lit Clevo Keyboard 
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330 Watt Power *BRICK*! 
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CPUGraphicsGraphicsRAM
Intel i7 3630QM HD 7970M HD 7970M 2x4GB 1333MHz 
Hard DriveHard DriveHard DriveOptical Drive
Crucial M4 256GB mSata Seagate Momentus 750GB Western Digital Scorpio Blue 500GB DVD Burner 
OSMonitorMonitorKeyboard
Windows 7 64-Bit Ultimate 17.3" 1920x1080 Matte Screen Auria 27" 2560x1440 Back-lit Clevo Keyboard 
Power
330 Watt Power *BRICK*! 
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post #3 of 4
Thread Starter 
Thanks! That is good to know.

I guess just for future reference then, what about making that cable if I ever needed to? Why wouldnt the adapter work?
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II x4 945 Gigabyte GA-790A-UD3 MSI GTX 460 Hawk Kingston 4gb DDR3 1866mhz 
Hard DriveOptical DriveOSMonitor
1tb Sata Plextor px-88osa Win 7 64bit NEC AccuSync LCD193wxm 
PowerCaseMouse
Hiper 580W Modular Cooler Master Elite Logitech mx518 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II x4 945 Gigabyte GA-790A-UD3 MSI GTX 460 Hawk Kingston 4gb DDR3 1866mhz 
Hard DriveOptical DriveOSMonitor
1tb Sata Plextor px-88osa Win 7 64bit NEC AccuSync LCD193wxm 
PowerCaseMouse
Hiper 580W Modular Cooler Master Elite Logitech mx518 
  hide details  
Reply
post #4 of 4
Red tends to be +5V, the reason the pc wouldn't boot is that the adapter is trying to feed +5V to the ground pins of the VRM's....

In saying that, if there's really +5V on that cable, then the pc shouldn't really boot with or without the adapter, so I've got no idea what's going on lol

EDIT, the adapter would feed it to the +12V input, no ground, anyway, still no clue what's going on
Edited by Goof245 - 10/31/11 at 7:07am
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Overclock.net › Forums › Volt Mods › General Volt Mods › Question for making 8pin mobo cable.