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Win7 doesn't recognize second video card

Last response: in Graphics & Displays
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October 15, 2010 12:25:33 PM

MB: ASUS P7P55D-E
Video Card #1 PCI-E 2.0 x16: EVGA 768-P3-1360-TR GeForce GTX 460
Video Card #2 PCI-E 2.0 x4: SPARKLE SX84GS256D2LDPP GeForce 8400 GS
O/S: Windows 7 Home Premium

I just installed the 8400GS so I can drive a 3rd monitor. But Device Manager doesn't see the new card, only the GTX460. Is there anything special I need to do to enable the 2nd video card?

I was assuming Win7 was gonna automatically pick up the second card. I originally had a ATI Radeon 7000 PCI card but it turned out that was incompatible with Win7 but at least it showed up as a Standard VGA Adapter. I bought the Sparkle just for the 3rd monitor.

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a c 171 Î Nvidia
a c 271 U Graphics card
October 15, 2010 12:29:52 PM

Have you tried the 8400 in all the spare slots?
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October 15, 2010 12:32:43 PM

Hi mousemonkey,

There are only 2 compatible PCI-E slots in the P7P55D-E. The other slots are either x1 or plain PCI slots.

I will give using just the Sparkle as a primary card a shot.

Mousemonkey said:
Have you tried the 8400 in all the spare slots?

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a b U Graphics card
October 15, 2010 12:35:33 PM

There has been a few people with issues installing a second card by the same designer (Nvidia/ATI). I don't know if this is a driver issue or not, you could try using older drivers to see if that works.
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a c 171 Î Nvidia
a c 271 U Graphics card
October 15, 2010 12:36:17 PM

There are four of those mobo's, which one do you have?
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a b U Graphics card
October 15, 2010 12:44:06 PM

He probably has the P7P55D-E PRO which only has two PCI-Ex16 length slots.
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October 15, 2010 12:51:16 PM

Don't plan to do SLI so didn't go for the Pro to save some dollars.

deweycd said:
He probably has the P7P55D-E PRO which only has two PCI-Ex16 length slots.

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a b U Graphics card
October 15, 2010 12:53:20 PM

Alright, did you try switching the cards yet?
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a c 171 Î Nvidia
a c 271 U Graphics card
October 15, 2010 1:07:54 PM

That link is to the Xfire board, no mention of SLi ability. That should still work though as the two cards are not SLi'ble.
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October 15, 2010 2:13:11 PM

I just tried booting up with 8400GS in the x4 slot (just pulled the 2 video cables from the GTX460). Monitor did not come on.

Then I tried making the 8400GS the primary in the x16 slot (GTX460 not installed). Monitor still doesn't come up. MB beeped twice but I heard the Win7 welcome screen sound so it looks like it booted to Windows.

At this point, I'm thinking it's a defective card and going to RMA it.

1. Would it better to go with another EVGA card? I want cheap but compatible.
2. Should I do PCI Express x1? Or PCI? Wondering if saving the x4 slot might not be a good idea.
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a b U Graphics card
October 15, 2010 2:19:51 PM

It does sound defective, you should RMA it. You should stick with a PCI-E card if your going cheap, it will save you problems.
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October 15, 2010 2:23:29 PM

I noticed there was a connector of some type. Not sure what it is. No docs or cables were provided.

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October 15, 2010 2:24:20 PM


Should I go PCI-E x1 instead of x4?

deweycd said:
It does sound defective, you should RMA it. You should stick with a PCI-E card if your going cheap, it will save you problems.

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a b U Graphics card
October 15, 2010 3:31:59 PM

Graphics cards come with a PCI-E x16 connector reguardless, you won't find a PCI-E x1 or PCI-E x4 graphics card.
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October 16, 2010 12:41:57 AM

Find out what the connector was. It's power for a fan if needed.
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October 16, 2010 6:18:18 PM

Bought a EVGA Nvidia 210. Installed right away. Thumbs Up!

Many thanks for quick responses and helpful suggestions!
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October 16, 2010 6:20:01 PM

Best answer selected by PotOdds.
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a c 171 Î Nvidia
a c 271 U Graphics card
October 16, 2010 6:21:11 PM

This topic has been closed by Mousemonkey
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