I am using Matrox CompressHD (H.264 encoder PCI card) on my 3.84 quad hackintosh with ATI Radeon HD6870 and Mavericks. I was thinking about getting nMP and was wondering what would be the encoding speed difference. With latest FCPX and Compressor I see some improvement in the software only encoding (OpenCL?) but it's nowhere near as fast as CompressHD. Does anyone have real life comparison experience between the two - nMP and CompressHD? How efficient is the OpenCL power of those n500 cards?