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Creating a Type-3 to PCI-E cable for a Corsair HX850i

post #1 of 3
Thread Starter 
I began to prepare my system for SLI today and discovered that I wouldn't have enough cables for dedicated lines from each PSU connector to the two GPUs and two motherboard power connectors.

http://www.overclockers.ua/news/power/114100-corsair-hxi-3.jpg

As the picture above shows, I only have 5 PCI-E connectors. I need 6. So I worked backwards from a 2x4-pin power to PCI-E adaptor and built a PCI-E connector to 3 x peripheral connectors.

My question is, will this work as well as the PCI-E connector from the PSU? Will the amp draw be evenly distributed or are these separate rails for a reason?

The adaptor looks like a fan splitter, except that each 12v/gnd pair on the PCI-E connector go to a separate 12v/gnd pair on a peripheral connector.
post #2 of 3
Why not just use a molex to PCI-E adaptor instead those cost almost nothing.
Seravee
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Seravee
(27 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming EVGA GTX 1080 FTW2 Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD40EZRX  WD Green WD60EZRX  WD Red WD80EFZX 8TB  
Hard DriveOptical DriveCoolingCooling
Seagate Ironwolf Pro 10 TB LG CH12NS30 x5 Noctua NF-A14 FLX Noctua NH-D15S 
OSMonitorMonitorKeyboard
Windows 7 64 Bit Asus PG279Q LG 49UH750V 4K LED TV Corsair Gaming Strafe RGB 
PowerCaseMouseMouse Pad
EVGA SuperNova G2 750 watt Phanteks Enthoo Luxe Roccat Kone XTD Laser Roccat Sense Metor 
AudioAudioAudioAudio
Sennheiser HD 598 Onkyo TX NR646  Harman Kardon HKTS 60 Dali Opticon Vokal 
AudioOtherOther
x2 Dali Opticon 2 CableMod E series PSU cable set CableMod LED Strips 
  hide details  
Reply
post #3 of 3
Thread Starter 
Quote:
Originally Posted by shilka View Post

Why not just use a molex to PCI-E adaptor instead those cost almost nothing.

That wouldn't be much fun, no would it? I didn't do that because it would't look good, in my opinion. Also, I was doing a teardown anyway.

My concern is that pulling from multiple rails and combining them into a single rail could be an issue, say if the voltages aren't the same because each rail is filtered independently? With such a critical component involved as the motherboard, it isn't a risk I want to take without first triple-checking my thoughts on this.
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