Ive used value ram before, ddr2 800 it was and it was fin, no overclocking leaway whatsoever but at stock speeds it was fine. I had it for 18 months problem free so it was fine for its rated speed.
Only issue i could see with obscure unbranded ram would be compatibility issues as your platform /motherboard is relativly new with less compat maybe, though someone else can comment on that aswell because im just guesisng there