My first post here, so hopefully I will not mess it up 
I'm going to build core i5 system. For RAM I had first choose a-data 2000X X Series, but then realized it's working at 1.6-1.8V. I know there is memory controller in i5 which can handle voltage up to 1.65.
Now the question is, no matter what P7P55D allows me to change for memory, it will always affect i5? So I can save some money and buy slower and lower voltage memories?
Thanks.

I'm going to build core i5 system. For RAM I had first choose a-data 2000X X Series, but then realized it's working at 1.6-1.8V. I know there is memory controller in i5 which can handle voltage up to 1.65.
Now the question is, no matter what P7P55D allows me to change for memory, it will always affect i5? So I can save some money and buy slower and lower voltage memories?
Thanks.