The Effect class has many overloads but there was none for a generic GraphicsBuffer...
effect.SetValue(EffectHandle paramater, GraphicsBuffer data)
could also add:
effect.SetValue(EffectHandle paramater, GraphicsBuffer<T> data)
I'm phasing out all my non-generic lists in my game but got stumped on this one.

Generic GraphicsBuffer overload for Effect class?
Tomy From Latvia
You may notice that the generic GraphicsBuffer derives from the non-generic version..
Therefore, you can already pass in GraphicsBuffer<T> to that method just fine.