Hey guys. So I have a newly acquired Mac Pro 1,1 ('06) with two 5160 3.0GHz processors. I bought two paired X5355 2.66Ghz CPUs thinking the computer I was getting was going to have the 2.0GHz processors. I've been reading cases where people upgrade to the X5355s because they run 15 apps at one time and use programs that use a lot of resources. I wouldn't be using my Mac Pro for anything that intense; the occasional use of Lightroom, Counter Strike Source (older game), and internet use. My question is: is the $200 upgrade to the X5355s worth it to me? Since my computer use isn't very intense, would I even notice a difference? I've upgraded the graphics card and plan to add more ram (thinking about 8 GBs). Any help is appreciated, thanks! FYI: Geekbench in 32bit mode gives me 6100 with my current setup.