You need to make sure your Mobo supportes the amount of speed the RAM have in your RAM cards, and to mix up two different ram cards you need to know the time latency and generation. (think its something else aswell..)
Hmm.. both of them have the same Latency, CAS and Voltage use, so they should work together from the specs..
Its either defect on in one of them or its because of the brand.. personal i never heard of those brands.