if you want here there is a alternative mode to vmod the vddr on the nf7-s v2.0, it's qithout any type of soldering, only silver conductive paint
http://www.pctuner.net/php/Articoli/Articolo.php?ID=224
i have used it and it works fine right now for about 4-6 month (don't remember exactly ) and continuosly changing memory sticks, so have good resistance...
unfortunatelly the article is always in italian but if you want i can translate the most confused parts, but as you can read my english isn't very good :p