Is there any significant difference between these two Corsair kits?

No difference in performance. The black ones were made pre-sandy, and are marketed to the nehalem's. The blue ones are made post-sandy, and are marketed thus. Perform the same, rated the same, just came out at different times.

The black ones MIGHT have a black PCB, but i dont know.
 
The black ones were made pre-sandy, and are marketed to the nehalem's. The blue ones are made post-sandy, and are marketed thus.

Actually, this is incorrect. All Vengeance modules are 1.5v or 1.35v and were produced to meet the Sandy Bridge voltage specifications. Also, we never sold any 2 module kits for Nehalem.
 
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