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8 pin graphic card connection with 6 pin power supply plug?

post #1 of 5
Thread Starter 
I have an odd question.

Say a graphics card has a 3 pin and a 4 pin connection but you only install 2 six pin connectors. What would happen?


I ask because I have a corsair power supply and the 8 pin pcie connectors are basically 6 pins with a 2 pin spliced onto the wires on the 6 pin making it an 8 pin.


Could you run a card that has a 6 and 8 pin connector with 2 six pin connectors?
   
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CPUMotherboardGraphicsGraphics
I7-3770K Gigabyte GA-Z77X-UP7 Saphire R9 290 Saphire R9 290 
RAMHard DriveHard DriveHard Drive
Corsair Dominator Platinum OCZ Vertex 4  OCZ Vertex 4 Seagate  
CoolingOSMonitorKeyboard
Custom Loop Windows 8.1 QNIX QX2710LED Logitech G710 
PowerCaseMouseAudio
Cooler Master V1000 Zalman GS1000 Logitech G502 Sound Blaster Z 
CPUMotherboardGraphicsGraphics
i7-3770k MSI Z77A-GD65 XFX HD 7870 Black Edition XFX HD 7870 Black Edition 
RAMHard DriveHard DriveHard Drive
Corsair Vengeance OCZ Vertex 4 OCZ Vertex 4 Seagate Baracuda 
Hard DriveOptical DriveCoolingOS
Seagate Baracuda Sony BR Corsair H100i Windows 8.1 PRO 
PowerCaseAudio
Corsair TX850w Old Gateway Case Creative Sound Blaster Z 
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post #2 of 5
I think some cards can detect if only 6 pins are connected and adjust power consumption accordingly (allow less OC / use lower clocks).

then 8 pin will provide the card extra Watts from the PSU, many 8pin cards come with a 6 to 8 adaptor, so no reason to plug in 2x6.
post #3 of 5
alternatively you could get an 8pin to 2 molex connector cable and do it that way. thumb.gif
post #4 of 5
Thread Starter 
The plugs on my power supply looked like this:





It seems like a cheap way out to running a complete cable from the power supply to the connector which is why ask. If the power supply manufacturers can get away with this design is an 8 pin really necessary.
   
CPUMotherboardGraphicsGraphics
I7-3770K Gigabyte GA-Z77X-UP7 Saphire R9 290 Saphire R9 290 
RAMHard DriveHard DriveHard Drive
Corsair Dominator Platinum OCZ Vertex 4  OCZ Vertex 4 Seagate  
CoolingOSMonitorKeyboard
Custom Loop Windows 8.1 QNIX QX2710LED Logitech G710 
PowerCaseMouseAudio
Cooler Master V1000 Zalman GS1000 Logitech G502 Sound Blaster Z 
CPUMotherboardGraphicsGraphics
i7-3770k MSI Z77A-GD65 XFX HD 7870 Black Edition XFX HD 7870 Black Edition 
RAMHard DriveHard DriveHard Drive
Corsair Vengeance OCZ Vertex 4 OCZ Vertex 4 Seagate Baracuda 
Hard DriveOptical DriveCoolingOS
Seagate Baracuda Sony BR Corsair H100i Windows 8.1 PRO 
PowerCaseAudio
Corsair TX850w Old Gateway Case Creative Sound Blaster Z 
  hide details  
Reply
   
CPUMotherboardGraphicsGraphics
I7-3770K Gigabyte GA-Z77X-UP7 Saphire R9 290 Saphire R9 290 
RAMHard DriveHard DriveHard Drive
Corsair Dominator Platinum OCZ Vertex 4  OCZ Vertex 4 Seagate  
CoolingOSMonitorKeyboard
Custom Loop Windows 8.1 QNIX QX2710LED Logitech G710 
PowerCaseMouseAudio
Cooler Master V1000 Zalman GS1000 Logitech G502 Sound Blaster Z 
CPUMotherboardGraphicsGraphics
i7-3770k MSI Z77A-GD65 XFX HD 7870 Black Edition XFX HD 7870 Black Edition 
RAMHard DriveHard DriveHard Drive
Corsair Vengeance OCZ Vertex 4 OCZ Vertex 4 Seagate Baracuda 
Hard DriveOptical DriveCoolingOS
Seagate Baracuda Sony BR Corsair H100i Windows 8.1 PRO 
PowerCaseAudio
Corsair TX850w Old Gateway Case Creative Sound Blaster Z 
  hide details  
Reply
post #5 of 5
If the psu has that connector it means it can deliver 150W thru that cable, but it can also be connected using just 6 pin, delivering a max of 75W.

if you connect just 6 pins, the PSU won't deliver more then 75W, which might not be enough depending on the card
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