Very High Performance fans for r7525

I am looking to upgrade the 6 fans in my r7525 server.  It current has the standard fans. I am trying to find out the difference between the following options:

 

PowerEdge R7525 Very High Performance Fan Customer Kit V3  384-BCTS

PowerEdge R7525 Very High Performance Fan Customer Kit    384-BCXN

 

Does anyone know the difference between the V3 and the non-V3?  There is about a $20 difference in price for each of the 6 fans.

 

I am also trying to understand whether or not it is necessary to upgrade from the standard fans.  I am upgrading the cpus from 2 x 7413 to 2 x 7h12s.  I needed to upgrade the PSUs from 2 x 800 to 2 x 1400.  Now I am trying to see if the fans also need to be upgraded.  When spec'ing out a new r7525 with these items, it seems to force standard fans depending on the heatsinks/riser options.  I have the 2U high performance heat sinks (not the L-shaped heatsink for the gpu riser options).  I do plan on using several 100GE mellanox NICs that could use the extra cooling.

 

thanks for any advice,

jp