Different type of 3930k to 4930k question... advice needed...

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http://forums.anandtech.com – This is going to be an abnormal question. Right now I have an Asus Sabertooth X79 board with a 3930k stable at 4.7 GHz. Within the next couple of months, I may have the opportunity to upgrade to the 4930k. In theory, this would be at no cost, but that is besides the point. My 3930k has no degradation yet that I know of, not sure if there will eventually be. Temps are pretty good with H100. After doing the obvious research, on average, I noticed there's a sweet spot with the 4930k @ 4.5 GHz. Would you stick with the 3930k @ 4.7 ghz, or go with the 4930k at 4.5 GHz? That (Hardware)