The RAM in the links that you provided will either not work at all, or may not work well with the 790i series board for the following reasons:
1. The 790i series boards do not use 4GB RAM modules. 2GB per slot is max.
2. The other two links are for low voltage RAM, which quite a few folks have problems running on the 790i chipset.
It is becoming difficult to find RAM that will run well on these boards because the 775 platform has reached it's end of life, so RAM manufacturer's are not producing RAM optimized for the 775 platform. The best RAM that you can still find for the 790i chipset is the following: http://www.directron.com/pvs34g1600elk.html http://www.directron.com/pgs34g1600elka.html