Hi all Hope somebody can point me in the right direction. I have a mac pro 2008 & use lion & ZDNet clock to overclock to 3.55Ghz. To get it to overclock I have to start up in 32 bit, use ZDNet clock & then restart in 64 bit. I am about to buy an Nvidia Titan & this requires Mountain Lion 10.8.4 But mountain lion does not have 32 bit mode. Any ideas? Thanks in advance.