This is second time i upgrade my old 2009 DP 2.26. First time i just upgrade to dual x5570 4 core 2.93 and make it top-end mac of 2009. get 32bit geekbench around 17000. I very happy with it. However, i just saw price drop on x5670 in the bay. Now you can get pair of it just $300. No need to wait. i just put it to my pros. That make my mac pro to 24000 32bit geekbench. More than today 2013 8core. Recommend for everyone. this is best-bang-for-buck now.