Whilst make my pc with pcpartpicker I got this issue "Kingston HyperX 8GB (2 x 4GB) DDR3-1600 Memory operating voltage of 1.65V exceeds the Intel Haswell CPU recommended maximum of 1.5V+5% (1.575V). This memory module may run at a reduced clock rate to meet the 1.5V voltage recommendation, or may require running at a voltage greater than the Intel recommended maximum."
Is there going be a problem and should I change?
CPU :Intel Core i5-4670K 3.4GHz Quad-Core Processor
If you already bought the ram then nah, it'll be fine, if you haven't bought it yet, get something else. for 1600 mhz ram there is no reason to be 1.65 v, you can get lower latency 1600 ram for the same money that is 1.5v. No reason to ever go above 1.5v until you get to 2133 mhz. The only reason for that voltage is they used lower quality chips on the memory and need that voltage to keep things stable.