R710 with single module memory configuration

hey,

I'm about to do a memory upgrade on R710 Servers running 2 Intel E5540@2.53Ghz CPUs.

There came up 2 questions:

1) Is it possible to run the systems with a single 16GB Module per CPU? so only installed one module in A1 Ch1 and B1 Ch1 each! is this a "optimized" mode?

2) What about 1600Mhz modules? are they compatible (example Kingston KTD-PE316S/8G )? and also 1600Mhz Low voltage modules (example Kingston KTD-PE316LV/16G ) and also Dell offers these modules as upgrades (example Manufacturer Part# SNPRKR5JC/8G Dell Part# A7134886 )

thanks for your thoughts

Frank