Thanks for the fast replies.
Can you name me some more big advantages that the 4.1 / 5.1 models can offer over the 3.1? Would be great and makes my decision easier to agree or disagree to the offering. 4.1 Machines are much more expensive here in Germany.
The big deal is the updated architecture to Nehalem/Westmere. This isn't just a CPU improvement, it is an improvement to the whole computer. Everything is much faster: CPU, I/O, memory. Hyperthreading, turbo clocks, bus speed, RAM speed, GPU, all PCIe slots are 2.0, bluetooth 2.1, all FW ports are FW800, bigger hard drive, and better official support for future versions of OS X. The 5,1 comes with wi-fi standard instead of optional, so a 3,1 or 4,1 might not have wi-fi.
There are also many, MANY more CPU choices if you want to upgrade a 4,1/5,1 then there are for the 3,1 (see the CPU link in my signature). The newer memory is not just faster, it's also less expensive.
If you get a 2009 4,1 and update the firmware, the computer becomes just as capable as a 2010/2012 5,1.
Hopefully you can see there is a
huge gulf between the 3,1 and 4,1+.
Do you know a cheap US Site, where i can look for cheap Mac Pro 4.1 / 5.1. You wrote something from 400 Dollars.
I don't think I said that, but a quick check on Ebay "completed listings" shows some 2009 Mac Pros have sold in the $250-$450 range. Most seem to be above $450 though.
The thing is, most Ebay sellers won't want to ship overseas and even if you find someone that does, you may have an unknown amount of tariff to pay when it comes into Europe that might wreck the deal.