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Unstable 12v Rail Voltage causing GPU issues?

Last response: in Graphics & Displays
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February 26, 2014 4:47:20 AM

Here is my setup:

Motherboard: MSI 890FXA-GD65
Processor:AMD Phenom II X6 1090T Black Edition 3.2Ghz CPU
GPU: EVGA Geforce 760 Superclock 02G-P4-2765-KR
PSU: ULTRA LSP SERIES V2 750W ATX POWER SUPPLY

So my 3-4 year old PSU died and I got this new Ultra PSU. Plugged it in started it up, everything worked fine. I got a new gpu to replace my EVGA 210. The 760 came put it in worked great for around 4 days and then it started going goofy(driver crashes, flickering browsers, different color taskbars). I RMA the product and I currently have the new one. While I was waiting I put my 210 back in and everything works fine. I call EVGA and they told me to check my rail voltage. The 12V rail voltage is at 12.1, but it will go to 12.25 for a little and then go back down. They told me that this is most likely the issue due to the RMA I sent in passed. So I just RMA'd my PSU.

I guess my real question is, is it common for rail voltage to cause issues with graphics card and does this sound like the actual issue?

I called Ultra and they suggested when I get the new PSU that I should update my motherboards BIOS and any other updates like that. Could it be something else causing the rail voltage to fluctuate or is it most likely one of the reasons stated above?

I have the new GPU now I just don't want to put it in then have issues like before. Any help would be greatly appreciated.
Thanks!
a b V Motherboard
February 26, 2014 4:55:04 AM

GPU and CPU are most power hungry components in the system and both draw power from +12v rail. In modern PSUs there is 45+Amps on +12v rail or there are many PSUs with +12v rails.

It could be that ATX12v/EPS12v power connectors are screwed up or simply there are not enough amps on the +12v rail.

When buying PSU always check the Amps on +12v rail.
February 26, 2014 5:11:54 AM

EasyLover said:
GPU and CPU are most power hungry components in the system and both draw power from +12v rail. In modern PSUs there is 45+Amps on +12v rail or there are many PSUs with +12v rails.

It could be that ATX12v/EPS12v power connectors are screwed up or simply there are not enough amps on the +12v rail.

When buying PSU always check the Amps on +12v rail.


Thank you for the quick response, this is the picture of my Mobo http://www.tigerdirect.com/include/AddCartfromGallery.a...
You mentioned the EPS12V. In the picture you can see an 8 pin connector on the upper left hand side, when the mobo first arrived it has a plastic cover on the bottom 4 pins so I kept it on and plugged a 4 pin in the top half. Should I instead have the 8 pin hooked up to it and remove the plastic cover?

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February 26, 2014 5:36:13 AM

Yes !! you could try removing the 4 pin cover and insert 8 pin connector. It may resolve the issue. Although technically it shouldn't create problems either way.
a b V Motherboard
February 26, 2014 5:48:34 AM

Sorry I'm getting Access denied message when loading that page.

I thing you are taking it wrong way. ATX12v is 4-8 pin power connector for CPU. EPS12v 6-8 pin is power connector for GPU. EPS12v is not connected on the mobo but on the GPU.
February 26, 2014 10:32:47 AM

EasyLover said:
Sorry I'm getting Access denied message when loading that page.

I thing you are taking it wrong way. ATX12v is 4-8 pin power connector for CPU. EPS12v 6-8 pin is power connector for GPU. EPS12v is not connected on the mobo but on the GPU.


Ya, I got those mixed up. But I was mainly asking about the ATX12V because I wondered what putting the 8 pin in would do, if anything.

I had a 6 pin and 6+2 pin connected into the gpu, I called EVGA and they said how I had the power setup was good. I couldn't get the 8 pin in it due to it being attached to the 4 pin which is connected to the cpu and not able to reach the gpu.



a b V Motherboard
February 26, 2014 10:42:33 AM

mmilhoan said:
EasyLover said:
Sorry I'm getting Access denied message when loading that page.

I thing you are taking it wrong way. ATX12v is 4-8 pin power connector for CPU. EPS12v 6-8 pin is power connector for GPU. EPS12v is not connected on the mobo but on the GPU.


Ya, I got those mixed up. But I was mainly asking about the ATX12V because I wondered what putting the 8 pin in would do, if anything.

I had a 6 pin and 6+2 pin connected into the gpu, I called EVGA and they said how I had the power setup was good. I couldn't get the 8 pin in it due to it being attached to the 4 pin which is connected to the cpu and not able to reach the gpu.





Using ATX12V you can use 4 pin or 8 pin connector. Normally 4 pin connector is sufficient but if mobo allows and cpu is more power demanding then 8 pin connection can be used.
February 26, 2014 10:51:35 AM

EasyLover said:
mmilhoan said:
EasyLover said:
Sorry I'm getting Access denied message when loading that page.

I thing you are taking it wrong way. ATX12v is 4-8 pin power connector for CPU. EPS12v 6-8 pin is power connector for GPU. EPS12v is not connected on the mobo but on the GPU.


Ya, I got those mixed up. But I was mainly asking about the ATX12V because I wondered what putting the 8 pin in would do, if anything.

I had a 6 pin and 6+2 pin connected into the gpu, I called EVGA and they said how I had the power setup was good. I couldn't get the 8 pin in it due to it being attached to the 4 pin which is connected to the cpu and not able to reach the gpu.





Using ATX12V you can use 4 pin or 8 pin connector. Normally 4 pin connector is sufficient but if mobo allows and cpu is more power demanding then 8 pin connection can be used.


Doing that would limit the power that would be getting to the gpu though right?
a b V Motherboard
February 26, 2014 10:57:21 AM

No. If there are enough Amps on the +12v rail.
!