Hi, First off I just joined this forum and this is my first time posting a thread so I'd like to say hi to everyone :wave: I recently bought a refurb Shuttle bare bones kit and this will be my first attempt at building a custom PC. Now to my question: According to the motherboard manual it was tested with Pentium 4 CPUs with Prescott Cores with an FSB of 800mhz and a max operating frequency of 3.6ghz. Now of course this kit isn't the newest one on today's market but I need to know if these specifications are what the system is limited too or not. Do I have to intstall a Pentium 4 processor with no more than 3.6ghz or will something like a Pentium D Dual Core processor with 2.8ghz work without compatibility problems? I just don't wanna go through the headache of having to return a CPU I've ordered over the internet if it doesn't work.