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Graphics card needs 8+6 pin PCI-E, PSU only has 6 pin

Last response: in Graphics & Displays
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January 10, 2014 4:55:01 PM

I'm in the middle of buying a new graphics card and I'm wanting to get the MSI GTX 760 TwinFrozr 2GB card from what I've gathered the card requires both a 6 and an 8 pin PCI-E connector and a minimum of 500W. My PSU is a Cooler Master extreme 500W supply but this supply only has one 6 pin PCI-E output and I'm just wondering if there's a way I can run this particular card with this PSU?
a b ) Power supply
a b U Graphics card
January 10, 2014 5:00:57 PM

You can buy a power adapter. 8 pin to 2molex connectors.
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January 14, 2014 9:05:15 PM

You can use a 2 x Molex to 8-pin cable if you have purchased one but it's recommended that you don't use it for an extended amount of time as it can sometimes reduce the lifespan of the card.
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a b ) Power supply
a c 98 U Graphics card
January 14, 2014 9:09:57 PM

My philosophy is if your PSU doesn't have the connectors for it, don't use it. Get a new PSU, obviously the one you have isn't designed for quality products.
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January 14, 2014 9:19:32 PM

woltej1 said:
My philosophy is if your PSU doesn't have the connectors for it, don't use it. Get a new PSU, obviously the one you have isn't designed for quality products.


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a b U Graphics card
January 14, 2014 9:25:38 PM

armedninja said:
I'm in the middle of buying a new graphics card and I'm wanting to get the MSI GTX 760 TwinFrozr 2GB card from what I've gathered the card requires both a 6 and an 8 pin PCI-E connector and a minimum of 500W. My PSU is a Cooler Master extreme 500W supply but this supply only has one 6 pin PCI-E output and I'm just wondering if there's a way I can run this particular card with this PSU?

Is it this model? http://www.coolermaster.com/service/support/extreme-pow...
I kinda agree with woltej1; Only having 1 6-pin PCI-E built in is not good; you may or may not want to risk it.

Note: you have enough power on the +12v rail, but it's cutting it close... in fact, it may be rather risky since the rails are split.
I estimated about 300VA (25amps on the +12v rail) for a guy with a AMD 8-core system and GTX 760. Your power supply can do 30amps, but it's split into two rails and may or may not distribute properly, especially with the lack of extra PCI-E cable.

Long story short, you can try it if you want to risk it. I would definitely not want to build a system like that if I had the choice though.
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a b U Graphics card
January 14, 2014 9:34:08 PM

The GTX760 TDP is 170W which works out around 14amps. If it is the PSU above, each 12v rail will only do 16A, which is cutting it close even if you have 1 rail feeding only the 760 and nothing else. 1 rail may just go to the PCIe connector, so potentially by using molexes you are tapping into the other rail, but 2 issues I see with this; you need to be sure which rail feeds which connectors and check that it's safe to join 2 rails together (which is what you'll be doing feeding them into the 760). I doubt it is ok to do this. I would suggest a better PSU with a combined 12v rail to make things easier and safer.

I did use molexes on a single rail supply to supply an extra PCIe connector, nothing wrong with that, it's the same 12v rail, but split rails are more complicated.
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