What do you mean by value and generic RAM? Like quality brand vs nameless chips?
And about the brands, those listed by you are the only best? You didn't mentioned Kingmax for ex, is it good?
If there is a power fluctuation, will the higher speed memory chips lose data faster? Cause I got one strange reset once in the middle of my work and I'm not sure why. The motherboard it's not a new model, but I bought it as new recently (I have 2 years warranty for it), so there shouldn't be problems with it.
I also got several sudden restarts when using GMAX (free 3d tool) with OpenGL driver selected. Can a software error cause instant restart? Everything else work fine, even if I use the entire phisical memory, so my current RAM can't be faulted, I guess.