SLI broken while each card works individually

[95139ieaci]

Spec
Motherboard:
Asus P7P55D-E PRO
2 x PCIe 2.0 x16 (single at x16 or dual at x8 / x8 mode)
Graphic cards:
GIGABYTE GTX 460 1G * 2

One of the graphic cards is repaired by GIGABYTE this week. Both cards works individually in the main PCIE slot, which is closer to the CPU. None of them works in the slave slot; alarm sounds with no display.
In a SLI setup, Windows Device Manager and nVidia Control Panel recognize only one graphic card. Everest seemingly reports two graphic cards.

Everest Report:
Display:
Video Adapter NVIDIA GeForce GTX 460 (1048256 KB)
Video Adapter NVIDIA GeForce GTX 460 (1048256 KB)
3D Accelerator nVIDIA GeForce GTX 460
Monitor Asus VH236H [23" LCD] (AALMTF099986)

 

[95139ieaci]

Everest Report:


--omitted--
Display:
Video Adapter NVIDIA GeForce GTX 460 (1048256 KB)
Video Adapter NVIDIA GeForce GTX 460 (1048256 KB)
3D Accelerator nVIDIA GeForce GTX 460
Monitor Asus VH236H [23" LCD] (AALMTF099986)
--omitted--
--------[ Chipset ]-----------------------------------------------------------------------------------------------------
[ North Bridge: Intel Lynnfield IMC ]
PCI Express Controller:
PCI-E 2.0 x16 port #0 In Use @ x16 (Gigabyte GeForce GTX 460 Video Adapter, nVIDIA GF104 - High Definition Audio Controller)
--omited--


--------[ Windows Video ]-----------------------------------------------------------------------------------------------

[ NVIDIA GeForce GTX 460 ]

Video Adapter Properties:
Device Description NVIDIA GeForce GTX 460
Adapter String GeForce GTX 460
BIOS String Version 70.4.13.0.1
Chip Type GeForce GTX 460
DAC Type Integrated RAMDAC
Driver Date 10/1/2012
Driver Version 9.18.13.697
Driver Provider NVIDIA
Memory Size 1048256 KB

Installed Drivers:
nvd3dumx 9.18.13.0697
nvwgf2umx 9.18.13.0697
nvwgf2umx 9.18.13.0697
nvd3dum 9.18.13.0697 - nVIDIA Detonator 6.97
nvwgf2um 9.18.13.0697
nvwgf2um 9.18.13.0697

Video Adapter Manufacturer:
Company Name NVIDIA Corporation
Product Information http://www.nvidia.com/page/products.html
Driver Download http://www.nvidia.com/content/drivers/drivers.asp
Driver Update http://driveragent.com?ref=59

[ NVIDIA GeForce GTX 460 ]

Video Adapter Properties:
Device Description NVIDIA GeForce GTX 460
Adapter String GeForce GTX 460
BIOS String Version 70.4.13.0.1
Chip Type GeForce GTX 460
DAC Type Integrated RAMDAC
Driver Date 10/1/2012
Driver Version 9.18.13.697
Driver Provider NVIDIA
Memory Size 1048256 KB

Installed Drivers:
nvd3dumx 9.18.13.0697
nvwgf2umx 9.18.13.0697
nvwgf2umx 9.18.13.0697
nvd3dum 9.18.13.0697 - nVIDIA Detonator 6.97
nvwgf2um 9.18.13.0697
nvwgf2um 9.18.13.0697

Video Adapter Manufacturer:
Company Name NVIDIA Corporation
Product Information http://www.nvidia.com/page/products.html
Driver Download http://www.nvidia.com/content/drivers/drivers.asp
Driver Update http://driveragent.com?ref=59


--------[ PCI / AGP Video ]---------------------------------------------------------------------------------------------

nVIDIA GeForce GTX 460 Video Adapter
nVIDIA GeForce GTX 460 3D Accelerator


--------[ GPU ]---------------------------------------------------------------------------------------------------------

[ PCI Express 2.0 x16: Gigabyte GeForce GTX 460 ]

Graphics Processor Properties:
Video Adapter Gigabyte GeForce GTX 460
BIOS Version 70.04.13.00.01
GPU Code Name GF104
PCI Device 10DE-0E22 / 1458-34FC (Rev A1)
Transistors 1950 million
Process Technology 40 nm
Die Size 320 mm2
Bus Type PCI Express 2.0 x16 @ x16
Memory Size 1 GB
GPU Clock (Geometric Domain) 405 MHz (original: 715 MHz)
GPU Clock (Shader Domain) 810 MHz (original: 1430 MHz)
RAMDAC Clock 400 MHz
Pixel Pipelines 32
TMU Per Pipeline 1
Unified Shaders 336 (v5.0)
DirectX Hardware Support DirectX v11
Pixel Fillrate 12960 MPixel/s
Texel Fillrate 68040 MTexel/s

Memory Bus Properties:
Bus Type GDDR5
Bus Width 256-bit
Real Clock 162 MHz (QDR) (original: 900 MHz)
Effective Clock 648 MHz
Bandwidth 20.3 GB/s

Utilization:
GPU 17%
Memory Controller 15%
Video Engine 0%

nVIDIA ForceWare Clocks:
Level #1 GPU: 50 MHz, Shader: 101 MHz, Memory: 135 MHz
Level #2 GPU: 405 MHz, Shader: 810 MHz, Memory: 324 MHz
Level #3 GPU: 405 MHz, Shader: 810 MHz, Memory: 1800 MHz
Level #4 GPU: 715 MHz, Shader: 1430 MHz, Memory: 1800 MHz

Graphics Processor Manufacturer:
Company Name NVIDIA Corporation
Product Information http://www.nvidia.com/page/products.html
Driver Download http://www.nvidia.com/content/drivers/drivers.asp
Driver Update http://driveragent.com?ref=59

nVIDIA GPU Registers:
nv-000000 0C4100A1
nv-0010F0 00000000
nv-001218 00000000
nv-001540 00000000
nv-0015F4 00000000
nv-0015F8 00000000
nv-0015FC 00000000
nv-001600 00000000
nv-001850 00000000
nv-004000 00000000
nv-004004 00000000
nv-004008 00000000
nv-00400C 00000000
nv-004018 00000000
nv-00401C 00000000
nv-004020 00000000
nv-004024 00000000
nv-004028 00000000
nv-00402C 00000000
nv-004120 00000000
nv-004124 00000000
nv-004128 00000000
nv-004200 00000000
nv-004220 00000000
nv-00C040 00000000
nv-00E114 0000021C
nv-00E118 000000D8
nv-00E11C 00000001
nv-00E120 00000000
nv-00E728 000E0036
nv-00E820 01030005
nv-00E8A0 00000000
nv-020008 C0083660
nv-020014 FA3E0393
nv-020400 00000028
nv-022438 00000004
nv-02243C 00000000
nv-022554 00000000
nv-100000 00000000
nv-100200 00000000
nv-10020C 00000000
nv-100214 00000000
nv-100474 00000000
nv-100714 00000303
nv-100914 00000000
nv-101000 A040488E
nv-10F290 040E0C0A
nv-10F294 3420C287
nv-10F590 00100204
nv-121C74 00000004
nv-419E9C 00000330

[ nVIDIA SLI ]

nVIDIA SLI:
SLI Status Disabled


--omitted till the end--

 

[redeemer]

Is the SLI bridge connected? Is SLI enabled in the Nvidia Control Panel??

 

[95139ieaci]

Is the SLI bridge connected? Is SLI enabled in the Nvidia Control Panel??

The bridge is connected, but I have no way of knowing whether the bridge is functional. Still, the SLI setup has been working for the past two years; there is no indication that the other parts of the setup, such as power supply, do not work. But is there a software tool that detect such problems?
Because Nvidia Control Panel only recognizes one card, the setting for SLI does not even show up.

 

[computernoob29]

it sounds like either the sli bridge is busted or its the motherboards second pcie 2.0 slot thats broken

 

[95139ieaci]

it sounds like either the sli bridge is busted or its the motherboards second pcie 2.0 slot thats broken

I suspect that too, but is there any way to know for sure? I don't want to send my motherboard away for a week for repair at all. I'd rather sell one of the card on craigslist lol.

Is a graphic card suppose to work in the slave PCIE slot?

 

[smorizio]

yes it should with the pci bride not conencted. have you tried running gpu-z to see if the model and ram speed and devcie id for the cards are the same if there not sli wont work.