Reply to Defected mac

Hi guys,

i just bought a mac pro 10.8 2 days back. Is it normal for the mac to get luke warm within fifteen mins of usage and hot within an hour or is my mac defected?! Also my mac has a ram of 8gb. thought previously i was using a compaq with 2gb ram and now this mac doesnt feel as much faster. Like might just be a tad bit faster but no real upgrade i feel. Please help me out.