RAM volt Question 1.5v or 1.35v?

[Mindfax]

Sup MacHeads?

First time Poster.

I ordered the new 27" iMac, fully-loaded, except RAM, I'll install 32GB later.
I went to Crucial, as an example, to check-out RAM options. Reading the particulars...I saw two different Volt configurations; 1.35v & 1.5v. Which is the preferred RAM to use? The best deal seems to be 2 - 16GB sets (8GB x 4).

I haven't ordered RAM in a long time...I'm out of the loop. Ever since the iPad came to market, I seldom use my current iMac or MacAir. I use the iPad for everything. Any other sites, or brands you want to recommend, please do.

Your guidance and or opinions are appreciated.

 

[BSoares]

1.35V should be better. Less power, less heat, same performance.

 

[rgdigital]

I just ordered the same config, and only see this one:

16GB kit (8GBx2)
DDR3 PC3-12800 • CL=11 • Unbuffered • NON-ECC • DDR3-1600 • 1.35V • 1024Meg x 64 • • Part #: CT3650282