The latest NVidia GPU architecture, Kepler, now has a dedicated hardware H264 acceleration block, NVENC.
It is similar in function/purpose to "Intel's Quicksync" (except that Quicksync works with more codecs: MPEG-2, VC-1, and H264. NVENC only supports H264 encoding.) The company claims the hardware-block can encode 1080p video much faster than the host-CPU alone (probably at the loss of some image quality.) This feature is supported on desktop NVidia GPUs with the model GT640, GTX6xx. And in laptop NVidia GPUs GT640M, GT650M, GT680M (and a few others.)
Does Premiere Pro CS6 take advantage of NVENC? If not, are there any third-party plugins that add NVENC-support to CS6?
If not, I'd like to try writing a plugin that uses NVENC, though that'd definitely be an ambituous undertaking!