It worked for me with 2.10.4
Thank you. I have already sold the 660 and replaced with 2 6950's since this post
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~\cgminer-2.11.4-windows>cgminer.exe -n
[2013-04-11 20:25:26] CL Platform 0 vendor: NVIDIA Corporation
[2013-04-11 20:25:26] CL Platform 0 name: NVIDIA CUDA
[2013-04-11 20:25:26] CL Platform 0 version: OpenCL 1.1 CUDA 4.2.1
[2013-04-11 20:25:26] Platform 0 devices: 1
[2013-04-11 20:25:26] 0 GeForce GTX 660
[2013-04-11 20:25:26] CL Platform 1 vendor: Advanced Micro Devices, Inc.
[2013-04-11 20:25:26] CL Platform 1 name: AMD Accelerated Parallel Processing
[2013-04-11 20:25:26] CL Platform 1 version: OpenCL 1.2 AMD-APP (1084.4)
[2013-04-11 20:25:26] Platform 1 devices: 1
[2013-04-11 20:25:26] 0 Barts
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] ADL found less devices than opencl!
[2013-04-11 20:25:26] There is possibly more than one display attached to a GPU
[2013-04-11 20:25:26] Use the gpu map feature to reliably map OpenCL to ADL
[2013-04-11 20:25:26] WARNING: Number of OpenCL and ADL devices did not match!
[2013-04-11 20:25:26] Hardware monitoring may NOT match up with devices!
[2013-04-11 20:25:26] 1 GPU devices max detected
[2013-04-11 20:25:26] USB all: found 5 devices - listing known devices
[2013-04-11 20:25:26] No known USB devices
~\cgminer-2.11.4-windows>cgminer.exe -n
[2013-04-11 20:25:26] CL Platform 0 vendor: NVIDIA Corporation
[2013-04-11 20:25:26] CL Platform 0 name: NVIDIA CUDA
[2013-04-11 20:25:26] CL Platform 0 version: OpenCL 1.1 CUDA 4.2.1
[2013-04-11 20:25:26] Platform 0 devices: 1
[2013-04-11 20:25:26] 0 GeForce GTX 660
[2013-04-11 20:25:26] CL Platform 1 vendor: Advanced Micro Devices, Inc.
[2013-04-11 20:25:26] CL Platform 1 name: AMD Accelerated Parallel Processing
[2013-04-11 20:25:26] CL Platform 1 version: OpenCL 1.2 AMD-APP (1084.4)
[2013-04-11 20:25:26] Platform 1 devices: 1
[2013-04-11 20:25:26] 0 Barts
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] Failed to ADL_Adapter_ID_Get. Error -1
[2013-04-11 20:25:26] ADL found less devices than opencl!
[2013-04-11 20:25:26] There is possibly more than one display attached to a GPU
[2013-04-11 20:25:26] Use the gpu map feature to reliably map OpenCL to ADL
[2013-04-11 20:25:26] WARNING: Number of OpenCL and ADL devices did not match!
[2013-04-11 20:25:26] Hardware monitoring may NOT match up with devices!
[2013-04-11 20:25:26] 1 GPU devices max detected
[2013-04-11 20:25:26] USB all: found 5 devices - listing known devices
[2013-04-11 20:25:26] No known USB devices