More hardware questions from emails:
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Does that mean that for example the Intel Xeon E5-2630L v4 overclocked would be about twice as fast as the i7 4790K and equally fast as a non-overclocked i7-6950X? Or are Xeons entirely different? I'm considering saving up for something beastly and getting an Edge license but only if it has significant performance gain for PIOsolving and especially if it doesn't have to be as expensive (like the overclocked Xeon seems to be).
First let me say that I am not sure how Broadwell compares to Haswell (previous generation) when it comes to the solver. Not many people have them and I am getting conflicting benchmarks (probably because of other factors on the computers it's run).
Assuming it's the same (it's probably a bit better in reality) E5-2630L Xeon is 10 core CPU at 1.8Ghz. That makes it 10*1.8 = 18.
4790k is a quadcore at 3.6Ghz which makes it 14.4
No-overclocked 5820k would be faster than both of them.
No you said "E5-2630" overclocked. I am not sure how much you can overclock it though. Those questions are best asked on some hardware forum.
As to 6950x, this is a 10 core machine at 3Ghz and it would be way faster than all other mentioned so far (10x3 = 30).
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Or are Xeons entirely different?
Xeons are like i7s with few "enterprise" features, ability to put 2 of them on one motherboard and significantly bigger price tag attached
Notice that 6950X won't be cheap either. In general those top ends CPUs always have very bad performance/price ratio.
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Basically, what could you recommend as best bang for buck in the €700 €1000 and €1500 region and roughly how many times faster would they be for PIOsolving compared to the i7 4790K?
If you search this thread (for example 2 posts above this one) you will see that my recommendation for a middle range desktop is 5820k. Hardware prices are also very local, depending on country/region you can get significantly different deals.