Not sure if this is a re-post, but I haven't seen it around so ...
See here for full details: vr-zone.com
"The N680GTX Lightning comes with out-of-the-box clock speeds of 1100 MHz (GPU base), 1176 MHz (GPU Boost), although the memory is left untouched, at 1502/6008 MHz (actual/effective). The GPU is armed with 2 GB of GDDR5 memory, across a 256-bit wide memory interface."
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