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2nd Graphics card not detected

Last response: in Graphics & Displays
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July 10, 2013 4:49:21 AM

Problem
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My PC used to work fine but then exhibited various problems and now does not detect my second graphics card. Any single graphics card in any slot will be detected. If both are in then only the top / primary one will be detected.

Symptoms
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The Gfx card fans will always spin up. If the EVGA card is in the second slot while the MSI is in the first then the EVGA fan will spin very loudly.

Before the current problem my PC started crashing randomly. This included BSODs but also the PC stuttering and then freezing. My Gfx cards were not overheating and my PC has been cleaned of fluff and dust.

I'm fairly sure the freezes and BSODs started after I updated to nVidia's 320.18 driver, which possibly conflicted with factory overclocked cards like mine.

I rolled back to 314.07 but the problems continued. Currently I'm running 320.49.


Specifications
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Spoiler

Operating System
Microsoft Windows 7 Ultimate 64-bit
CPU
Intel Core i7 920 @ 2.67GHz 40 °C
Bloomfield 45nm Technology
RAM
6.00GB Single-Channel DDR3 @ 534MHz (8-8-8-20)
Motherboard
Manufacturer ASUSTeK Computer INC.
Model Rampage II GENE (LGA1366)
Chipset Vendor Intel
Chipset Model X58
Chipset Revision 12
Southbridge Vendor Intel
Southbridge Model 82801JR (ICH10R)
Southbridge Revision 00
System Temperature 29 °C
BIOS
Brand American Megatrends Inc.
Version 0705
Date 2009/04/09
Graphics
EVGA GTX460 SC
MSI N460GTX cyclone igd5 OC
EDIT: PSU
Vantec iON2+ 600W
a b V Motherboard
a b U Graphics card
July 10, 2013 4:54:56 AM

Can you tell us what brand of power supply you are using and how many watts it is rated at. And what model number of graphics card`s

And how long you have had your power supply.
Psu`s degrade over the time they are in use and become less stable.
Often blue screens, unexplained shut down`s and hardware not being detected can be a cause of the PSU in the system failing.
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July 10, 2013 4:58:27 AM

As Shaun O said what power supply have you got? More importanly what brand is it? And it could be due to that fact that your trying to run a different brand of card?
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Related resources
July 10, 2013 5:07:10 AM

Benjamin Cummins said:
As Shaun O said what power supply have you got? More importanly what brand is it? And it could be due to that fact that your trying to run a different brand of card?


I updated the PSU info. I think it's about 2 years old. Swapping the power cables between the Gfx cards doesn't make a difference.

I understand that the Gfx card brand does not make a difference, just that the models need to be the same. I've been running them in SLI for a year without a problem, until recently.

EDIT:
Updated Gfx card info
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a b V Motherboard
a b U Graphics card
July 10, 2013 5:13:06 AM

it could be a driver problem, to make sure it is not, download driver fusion and the latest drivers.

install driver fusion.
uninstall nvidia drivers but do not restart when prompted.
run driver fusion and clean the nvidia drivers then restart.
install latest drivers again.

do this just to make sure its not something with drivers.

if this does not work then it could be the power supply.
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Best solution

a b V Motherboard
a b U Graphics card
July 10, 2013 5:17:54 AM

Most likely the power supply is the problem.
I would suggest a 750watt unit for dual 460's. This would run the power supply in the 70 to 80% range of its rated capacity.
Alway buy quality units ,such as SeaSonic, XFX, Corsair.
Power supply list. Always choose Tier 3 or above for a good stable unit.
http://www.eggxpert.com/forums/thread/323050.aspx
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July 10, 2013 5:18:34 AM

mauller07 said:
it could be a driver problem, to make sure it is not, download driver fusion and the latest drivers.


Thanks mauller07
I actually already did this exact procedure when I rolled back my drivers. I followed another article for people who wanted to uninstall the 320.18 drivers.
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July 10, 2013 5:22:38 AM

Unolocogringo said:
Most likely the power supply is the problem.
I would suggest a 750watt unit for dual 460's.


Thanks Unolocogringo
Is there a way for me to test this out first before spending money? Should I disconnect all my unnecessary harddrives to reduce power consumption and test again?
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a b V Motherboard
a b U Graphics card
July 10, 2013 5:56:11 AM

First try one card in the second slot, to rule out a problem with the 2nd slot.

you can try unhooking all peripherals except one hard drive but it may or may not be enough. It is worth a try to see after you check a single card in the second slot.
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July 10, 2013 6:40:28 AM

It looks like the cards function according to which power cables are being used after all, and not what slot they are fitted in. I'm going to look into getting a new PSU. If that solves the problem then I'll update the thread
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July 17, 2013 2:41:39 AM

I fitted a new PSU and it seems to have solved the issue with the Gfx card not being detected. I'll have to wait and see if there's still other instabilites, like freezes and BSODs.
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July 19, 2013 7:14:50 AM

Looks like a new PSU was not the entire solution. One of my initial problems has been fixed, not being able to run 2 Gfx cards at the same time, but freezes and BSODs still occur.

This is the new thread addressing this issue.
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