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Okay, solved this on my own.
Simple the HD 4850 card is not yet suited for GPGPU calculations, and the texture did get copied through system memory.
The HD 6xxx series cards ran this demo at ~600 fps, as expected.
The 4850 is a very powerful card for a subset of GPGPU calculations(and mainly using CAL, not OpenCL), but the HD5XXX series and later is the first generation of hardware that was designed with OpenCL in mind, so it is recommended to use at least that generatation.