I am looking at buying an old HP 6005 Pro, HP's site lists support up to Phenom 2 X4's but I think that might be just because they only listed what was available at the time. Since then there was Phenom 2 X6's that were also AM3. Could I plug in the highest Phenom 2 X6 or are there other consideration? Obviously the pins would fit but are there other concerns? Thanks for the help!