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Difference Between SURF_GPU and non-GPU SURF?

I am using OpenCV 3.0 with VS2012 C++/CLI on a Win 8.1 64 bit machine.

I am using SURF to detect keypoints in full HD webcam images and am experimenting with both the GPU version and non-GPU version of SURF. One thing I notice is that the GPU version is finding about 20% fewer keypoints than the non-GPU version.

Is this something that others have seen? Is it expected?

Thanks, James