Is my graphics card not getting enough power?

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tomshardwarenoob

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Jun 13, 2013
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Hello. I've been experiencing problems with my PC lately, after changing the psu. I used to have a corsair TX650 v2 and everything worked fine, but now im using a corsair CX500M and problems have started. I have an i5-3570k and a radeon HD 7870 limited edition, so the cx500m should be able to handle my system.

What's happening is after running graphic intensive programs like games or MSI kombustor for a few minutes my PC will randomly freeze. I cant move the mouse, cant ctr alt delete, its completely frozen so that i have to hard restart it.

I think the main culprit is the PCIE connectors that came with the psu. The end that plugs into the psu is an 8 pin with one dummy pin like this:
http://imageshack.us/photo/my-images/856/img0008lks.jpg/

A total of 8 wires come out of it but along the way 2 split off into the +2 of the first pcie leaving 6 wires to go into the first pcie 6 pin, BUT THEN, it daisy chains into another pcie 6+2 like this: http://imageshack.us/photo/my-images/39/img0009m.JPG/

Would this connector cause my graphics card to not receive enough power or is my CX500M just too weak? Thanks for any helpful answers!
 
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tomshardwarenoob

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Jun 13, 2013
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Hi, my temperatures are all normal under 70 for the gpu under 50 for the cpu. Like I said this problem only started occurring after i switched my psu. My old one had 2 separate Pcie 6+2 cables while this one has them daisy chained. Wouldn't that cause each to have half the power?
 
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Shaun o

Shaun o

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Oct 7, 2007
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I would presume that cable your looking at there would be the one you connect from the PSU to a 6 or eight pin 12v located next to the cpu socket. 6+2 is always used to drive the 12v not a pci-e graphics card.
And you have used that one to power the card by mistake thinking it was the right one to use sadly the out put from that one is not the same.

Your corsair CX500M has 3 optional 6 pins that should be used to drive a graphics card, by using the 6 pin to six pin cable provided. That`s what I figure anyway looking at the back of the Psu picture bellow.

https://www.google.co.uk/search?q=corsair+CX500M&tbm=isch&tbo=u&source=univ&sa=X&ei=ei26UfCJNaHU0QWkhoDYBw&sqi=2&ved=0CGcQsAQ&biw=1680&bih=987#facrc=_&imgrc=BoctSI3FCUiuQM%3A%3Bpvz4T_OH6ABENM%3Bhttp%253A%252F%252Fwww.corsair.com%252Fmedia%252Fcatalog%252Fproduct%252Fc%252Fx%252Fcxm430_500_600_backview_2.png%3Bhttp%253A%252F%252Fwww.corsair.com%252Fus%252Fcx-series-cx500m-modular-atx-power-supply-500-watt-80-plus-bronze-certified-modular-psu.html%3B800%3B436
 
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tomshardwarenoob

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Jun 13, 2013
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This is the cable intended to be used to power a Pcie graphics card or 2. The 24 pin and 8 pin cables for the mother board are non modular so cannot be removed. the back of the unit looks like this http://imageshack.us/photo/my-images/20/cxm430500600backview2.png/ except on mine the outputs are labeled. the 8 pin says 6+2 pcie, indicating it is only designed for 1. the 3 other 6 pins are labeled peripheral and are used to connect the sata and molex connectors
 
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tomshardwarenoob

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Jun 13, 2013
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its an 8 pin that splits into two 6+2 pins. My question is will this provide as much power, as say, 2 separate 6+2 pins, or will it not and cause my system to freeze?
 
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