On eBay there's several sellers or "companies" if you want, that sell "modified" Mac Pros. In fact, none of all of the Mac Pros seem to be original. I'm talking about the old Mac Pro by the way. 5,1. You can configure your Mac Pro in the way you want it, they allow you to choose the hard drive you want, the RAM you want, etc. But they also change the processors on many of them. For example I'm looking for a 12-core 5,1 from mid 2010 with 2,93 GHz. All of those I found were actually 2,4 GHz ones, some even 4,1 Mac Pros, upgraded with the newer Processors. All of these companies, wether they're based in the UK or Germany, told me it's impossible to find some original ones. I'm in Europe by the way. They also offer one year warranty, some even up to three for an addtional sum. Is it okay to buy from them? Even if there's a warranty I feel like I don't have a real Mac Pro, you know. But performance is what counts for me obviously. I'm also wondering what the Mac Pro will be intentified as if I register it at Apple, will it say it's a 2,4 GHz for example, even if it's a 2,93? And does that matter anyway? Thanks a lot lads.