I just took delivery of a late 2013 iMac with a GTX 780M installed. I installed the latest CUDA release (5.5.28) and ran a few samples to check everything works. The device-device bandwidth seems very low (32GB/s) in the bandwidthTest sample. The bandwidth in the specs is 160GB/s (GeForce GTX 780M | Specifications | GeForce), I know that actual bandwidth is usually less than this but not less than 1/5th! Has anyone else had similar issues and been able to resolve them?
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