I originally built this box with 2X1GB of Corsair XMS2 6400 5-5-5-2T, and it was very stable. Then, a great deal on a 2X512MB kit of Kingston ValueRam 6400 (also 5-5-5-2T) came along, and I jumped on it.
At first, it seemed ideal, and I noticed much better times in video editing, but the...