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Cannot enable SLI

Last response: in Graphics & Displays
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June 20, 2012 11:39:30 PM

I am trying to setup my pc in SLI with a dual gtx 260. i have an asus rampage ii gene motherboard. I plugged them up along with the bridge. The pc recognizes both cards are present but in the nvidia control panel it does not give me an option for SLI. I know this motherboard supports SLI. I also updated to the latest bios from ASUS. not sure what the problem could be. any ideas?

More about : enable sli

a c 402 Î Nvidia
a b Ĉ ASUS
a b V Motherboard
June 20, 2012 11:43:31 PM

Uninstall and then reinstall the drivers.
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June 23, 2012 5:39:01 PM

I also tried that after posting this message and it didn't do anything different. still nothing. I am going to try and switch out psus to see if that makes any difference
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Related resources
a c 86 Î Nvidia
a b Ĉ ASUS
a c 218 V Motherboard
June 23, 2012 6:10:35 PM

What is the make and model of each of the GeForce GTX 260 graphics cards? Those cards were available using GT200 GPUs based on different process technonologies.

Does one of them use a GT200 (65 nm process) with 192 CUDA Core GPU and the other one use a GT200a/b (a = 65 nm or b = 55 nm process) with 216 CUDA Core GPU? If the answer is yes then SLI isn't going to work.

The GPUs and Memory Interface Widths on both cards have to be the same.
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June 23, 2012 10:14:14 PM

Display device : GeForce GTX 260 on GT200 GPU
Display driver : 8.17.13.0142, 301.42
On-board memory : 896MB
BIOS : 62.00.4c.00.01
GUID : VEN_10DE&DEV_05E2&SUBSYS_82E31043&REV_A1&BUS_2&DEV_0&FN_0
Multi-GPU role : master

GPU2
________________________________________________________________________________
Display device : GeForce GTX 260 on GT200 GPU
Display driver : 8.17.13.0142, 301.42
On-board memory : 896MB
BIOS : 62.00.1a.00.18
GUID : VEN_10DE&DEV_05E2&SUBSYS_0ABA19F1&REV_A1&BUS_3&DEV_0&FN_0
Multi-GPU role : synchronized with master


not sure whether its a or b, dont know where i would go to find that information. I got this information from MSI afterburner.

i also switched out the PSU to a silent proM 850W coolmaster.
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a b Î Nvidia
a b V Motherboard
June 23, 2012 10:22:13 PM

You can find that information (like CUDA core count) with GPU-z (http://www.techpowerup.com/gpuz/)

Do their clocks match? If not, you're gonna have to alter them through Msi afterburner.
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a b Î Nvidia
a b V Motherboard
June 24, 2012 2:04:39 PM

Core count shouldn't matter, I had no problems running a 192 and a 216 in SLI
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June 24, 2012 6:35:31 PM

here's what i came up with after installing techpowerup.

gpu 1

gpu: GT200
Revision B1
Technology 55nm
transistors 1400m
bios version 62.00.4c.00.01(p0897-0053)
device ID:10DE-05E2
subvendor: ASUS (1043)
ROPs:28
Bus interface PCI-E2.0x16 @ 16 2.0
Shaders: 216 unified
directx support 10.0/SM4.0
pixel fillrate 16.5 Gpixel/s
texture fillrate 42.5 GTexel/s
memory type: GDDR3
Bus width: 448 Bit
memory size: 896 MB
bandwidth: 111.9 GB/s
drivers version: nvlddmkm 8.17.13.142(forceware 301.42)/ win 7 64
GPU clock 590 MHZ
memory: 999MHZ
shader:1272 MHZ

Default clock 576 MHZ
memory 1015 MHZ
Shader 1242 MHZ

NVIDIA SLI: disabled




GPU 2

GPU: GT200
Revision: A2
Technology: 65nm
transistors: 1400M
Bios version: 62.00.1A.00.18(P0651-s009)
Device ID: 10DE-05E2
Subvendor: BFG Tech(19F1)
ROPs: 28
Bus interface: PCI-E 2.0x16 @ 16 2.0
Shaders: 216 unified
directX support: 10.0/SM 4.0
Pixel fillrate: 16.5 GPixel/s
texture fillrate: 42.5 GTexel/s
Memory type: GDDR3
Bus width: 448 Bit
Memory size: 896 MB
Bandwidth: 111.9 GB/s
driver version: nvlddmkm 8.17.13.142(Forceware 301.42)/ win 7 64

GPU clock: 590
Memory: 999 MHz
Shader: 1272 MHz

Default clock: 590 MHz
Memory: 999 MHz
Shader: 1296 MHz

Nvidia SLI: disabled
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a b Î Nvidia
a b V Motherboard
June 24, 2012 6:39:40 PM

You need to overclock the first card to match the speeds of the second card.
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a c 86 Î Nvidia
a b Ĉ ASUS
a c 218 V Motherboard
June 24, 2012 9:30:30 PM

Does each card function properly by itself?

If either one is defective in any way then SLI can't be enabled either.

Have you tried swapping the cards around in the slots (i.e. BFG card in primary PEG slot and ASUS in secondary PEG slot)?
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June 24, 2012 9:33:25 PM

both cards work properly by themselves. I tested them individually and they both work fine. i'll try switching them out to see if that makes any difference. will get back to you...
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June 24, 2012 9:50:33 PM

i just swapped out the cards. nothing. still nothing on the nvidia control panel
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!