Renegate

Just as followup on the insident
 
2 drives on the array had died and the health check on the HP was showing them as healthy! We had the raid shiped to a recovery company that repaired the motor on one of the disks so that we can access the array again. As of now i officially hate raid on HP. The raid even though it was recovered all the data in it was partially or totaly corrupted. We managed to scrap bit's and pieces of our data but it's totally a mess.

I believe it's really nice at 80 euro per CPU.

So my instict was right. I was going to make a bad choise. Is there a cheap 4 CPU choise if i only buy 2 cores only? 
 
Oskarha your suggestion is really nice!! 

High ammount of packet generation and VM computing. I'm doing many things that require even 1GB/s susteined data production for troubleshooting and optimization.

First, it's worth bearing in mind that the Z170 chipset has up to 20 PCIe 3.0 lanes available, in addition to the 16 PCIe 3.0 lanes from the CPU.
 
Now, as far as I can tell, what the Asus Z170-WS board does is use the 16 CPU lanes for the 4 main PCIe slots. They use a PLX chip to basically double the PCIe lanes from the CPU, to 32.
 
If you put the graphics cards and the 10Gbit ethernet card in three of the main PCIe slots, the first card will have 16 PCIe 3.0 lanes, and the other two will have 8 lanes each. That should be perfectly fine.
 
The PCIe lanes from the chipset are used for all the other ports and slots. So the M.2 slots have plenty of PCIe lanes available.
 
So...
 
1. Yes
2. The link through the chipset is limited by the bandwidth of the DMI 3.0 connection to the CPU. That's just under 4GB/s in theory. If you RAID0 a couple of fast M.2 NVMe drives, they would in theory be capable of speeds up to around 5GB/s in some situations. So the chipset would bottleneck that a bit. But 5GB/s is already way more than a 10Gbit ethernet connection can handle. Even if you're saturating a 10Gbit internet connection with torrents, that's "only" 1.25 GB/s. The system can handle that just fine. And if you're gaming, the communication between the CPU and graphics card happens across separate PCIe lanes, so that's not affected.