Hi there, I have an old mac 1,1 2.66 dual-core intel xeon and im stuck on Lion. I would like to increase the speed and also upgrade to El Capitan. I see than you can upgrade the intel processors. Would you happen to know what processors are the top speed that are compatible with my macpro? If I upgrade the processors will it run El Capitan without having to tweak the boot software? Thanks for your help.
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