DV Info Net - New Workstation for pREMIERE pRO cc 2015

I am working with a local computer shop that refurbishes HP 840 workstations to build me a fast, reliable editor. I do a lot of AVCHD multi- cam stuff (mostly concerts) using 4 video tracks, and my current system (a 3 year old HP with a i7 990 "Extreme", 24GB DDR2 ram, and Nvidia 570 series video card.) It often chokes when trying to play back the AVCHD multi-cam timeline, renders take seemingly forever and it cannot edit 4K with it. I am getting a Sony FS5 soon, so that's a consideration as well.

I am looking at a system with the following components, and am curious if this would be enough to edit 4k,from the FS5, and possibly a few more tracks maybe up to 6, of video on my more elaborate concert videos.
So here it is:

Intel Xeon E5-2630v3 x 2
64GB DDR-4 RAM
Nvidia K5200 video card
Samsung 512Gb 850 Pro boot drive for Windows and programs only
Samsung 2TB 850 Pro for projects
Back-up to existing Synology RAID 5 8TB
Thunderbolt 2 port
LG Blu Ray Read/Write

That's the basics of it. This is for a business that I earn my living from, reliability is as critical as speed to me.

Any input would be greatly appreciated.
Thanks in advance,
SW