Multirail PSU: Single PCIe connector splits into 6pin & 6+2pin for GPU, safe?

jerrylshen

Commendable
Dec 14, 2016
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0
1,510
Hi,
This is the PSU I am interested in buying for $40 from a friend. I was wondering if it's safe to use the PCIe splitters for GPUs considering that this is a multi rail PSU, or at least according to my research.
PSU: EVGA SuperNOVA NEX750G Gold Power Supply;
http://www.evga.com/Products/Specs/PSU.aspx?pn=D2A98331-4C5B-4CEE-9A94-D5F1AE46AB98

I have looked at past threads (http://www.tomshardware.com/answers/id-2560145/pcie-cable-power-gpu-gtx970-pci-cables.html) but those PSUs are single rail.
Thanks
 
Solution
The modular cables that come with a psu really aren't splitters. Splitters are aftermarket extension cables that you would add on to a PSU when it doesn't include enough connectors. The modular cables are safe to use; you should have no problem. The PSU has been designed to handle GPU power draw over those GPU cables.
You could run into problems with a multi-rail psu using splitters because you could draw more power than a single rail is designed to output, but it's not a problem you ever need to worry about. Using a true splitter is potentially dangerous for all psus because it may cause cables to overheat and fail. Also, any PSU that advertises a high wattage rating but lacks the necessary connectors to actually use it is probably junk.


No, I mean that the PSU comes with these splitters. I have read that splitters are safe if the PSU is single rail, but the EVGA one that I have listed is a multirail and my question if using the included splitters for GPUs is safe or not
 
You're getting that wrong, single 12 V rail and multi rail got nothing to do for certain rail = certain connector.

CPU, graphic card, and motherboard's chip/controller has their own VRM design, the easiest way to find out if a 6+2 PEG connector splits into two 6 pin & 6+2 pin is "go ahead and try", a graphic card that has 6 pin usually rated 125 watt, 6 pin & 6+2 pin usually rated over 200 watt TDP, (75 from PCIe slot + 75 from 6 pin + 150 from 6+2 pin) sharing 150 watt supply will make each card supplied by 75+75+75 watt.
 
The modular cables that come with a psu really aren't splitters. Splitters are aftermarket extension cables that you would add on to a PSU when it doesn't include enough connectors. The modular cables are safe to use; you should have no problem. The PSU has been designed to handle GPU power draw over those GPU cables.
You could run into problems with a multi-rail psu using splitters because you could draw more power than a single rail is designed to output, but it's not a problem you ever need to worry about. Using a true splitter is potentially dangerous for all psus because it may cause cables to overheat and fail. Also, any PSU that advertises a high wattage rating but lacks the necessary connectors to actually use it is probably junk.
 
Solution