Intel OpenCL SDK (Alpha) is available for testing.

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http://software.intel.com/en-us/articles/intel-opencl-sdk/

Intel® OpenCL* SDK is an Alpha software release. It is an implementation of the OpenCL* 1.1 standard optimized for Intel® CoreTM processors, running on Microsoft* Windows* 7 and Windows Vista* operating systems.

This alpha release of the Intel® OpenCL SDK supports the following OpenCL* 1.1 optional features and extensions:

   1. Out-of-order Execution model
   2. Execution of native kernels
   3. Image support
   4. Complier optimization options
   5. Double precision floating point support
   6. Creating OpenCL* context from an OpenGL context or share group
   7. Sharing memory objects with OpenGL* or OpenGL* ES buffers, texture and render bugger objects

The Intel® OpenCL SDK contains optimizations that require the Intel® Streaming
SIMD Extensions 4.1 (Intel® SSE 4.1) instruction set. It will work on the following
CPU’s, all of which contain Intel® SSE 4.1 or higher
       Intel® CoreTM i7 Processors
       Intel® CoreTM i5 Processors
       Intel® CoreTM i3 Processors
       Intel® Xeon® Processors, 5500 series
       Intel® Xeon® Processors, 7400 series
       Quad-Core Intel® Xeon® Processor 5400, 3300 series
       Dual-Core Intel® Xeon® Processor, 5200, 3100 series
       Intel® CoreTM 2 Extreme Processor, 9000 series
       Intel® CoreTM 2 Quad Processor, 9000 series
       Intel® CoreTM 2 Duo Processor, 8000 series
       Intel® CoreTM 2 Duo Processor E7200

 The Intel® OpenCL SDK 1.1 supports the following operating systems:
       Microsoft* Windows* 7 (32-bit version)
       Microsoft* Windows* 7 (64-bit version)
       Microsoft* Windows Vista* (32-bit version)
       Microsoft* Windows Vista* (64-bit version)