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.
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.
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.