Based on your screen shots, your only running your ram at pc2-6400 speeds, well just below actually... Perhaps thats why it says it your max, try running your ram closer to it designed speed and see what it shows in cpu-z.
Most 8500 RAM is exactly the same chips as the 6400 stuff just speed binned depending on their capabilities - the higher quality stuff becomes 8500 parts... for several reasons including compatibility the SPD is programmed with 6400.
Search on these forums and you'll see its been asked several times recently.
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