1600 is better then 1700 for gaming, since it has higher frequency per core in multicore loads. Most games are barely optimized for 8 cores, so the higher frequency you have on a 4-6 hardware threads, the better frame rate you'll get.I think that for gaming 1700 might be overkill and 1600 should do the same job properly while putting huge cpu load on 1700 with NH-L9i might not be perfect.
1700 consumes as much power as 1600 (according to various tests), so you'll get the same temperatures with 1600 as with 1700
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