allegedsin,
Workstation hardware is quite specialized and for the best results at the lowest costs, it's best to work backwards from the applications- the tasks, the software used, and a target budget. I'd first question the use for all those cores / threads as the range of multi-threaded applications is limited- CPU-based rendering, some video editing and processing programs (and you mention video encoding which is very CPU-intensive), and custom-algorithmic scientific programs such as Matlab. In general, systems that are good at workstation tasks are said to be not very satisfying for gaming- the needs for image
quality conflict with image
speed.
If you can use all the threads, the question is also a good balance between the number of threads and the CPU speed. In my work, I do renderings that can use multiple threads, but most of the time is in the 3D CA modeling, so I opted for fewer, but faster cores (4 cores / 8 threads @ 3.6 / 3.8GHz) with a wide bandwidth and actually, the renderings are still faster than my older Dell Precision which has 8 cores / 16T @ 3.16. The memory and disk subsystems are also much faster now as are the GPU's.
As regards, your proposed system, the parts appears to be compatible, but I think the gaming performance of the Xeon X5650 (2.66 /3.06GHz) would not be near your E3-1230 v3 system and the 1333 memory at higher latency, and general disk system just not very peppy. On passmark Performance Test a z800 with 2X X5650, GTX 780 , Samsung Evo 840, 6GB RAM:
Rating = 3100, CPU=12519, 2D = 500 , 3D= 6862, Mem = 1369, Disk = 1941
The limitations of the z800 board become apparent when comparing the highest rated system using a pair of X5650's:
EVGA Classified SR-2, Radeon R9 280X, 48GB, Plextor PX-128 >
Rating = 4656, CPU=16469, 2D = 761 , 3D= 6213, Mem = 2291, Disk = 3069
> so the X5650 is capable of good things, and although the EVGA Classified SR-2 is- today about $200 used , I'd say the extra cost would be well worth the investment.
Also, it's possible to buy the excellent X5670 (6-core 2/93 / 3.33 in the $80-90 range and I'd recommend looking fro a pair of those:
2X x5670, EVGA SR-2, GTX 770, IBM RAID controller, 24GB:
Rating = 5580 CPU=14923, 2D = 858 , 3D= 6796, Mem = 12124, Disk = 17458 ! (I'm assuming there are is a high performance 1+0 RAID on that IBM M1015 controller (which cost about $130 used)
Without knowing your expectations, I'd predict the z800 board would not provide an excellent experience. If you'd really like to stay with the X5650, the EVGA Classified SR-2 is the best, followed by Dell Precision T7500.
You could approach your project by buying a used T7500. A system with a 2X Xeon X5650 , a GTX 680, Corsair Neutron 240GB, 24GB RAM:
Rating = 4074, CPU=16303, 2D = 656 , 3D= 5500, Mem = 1821, Disk = 2870
There are so very many T7500's you might find a dual X5670 system reasonably:
http://www.ebay.com/itm/DELL-PRECISION-T7500-2x-XEON-X5670-2-93-6-Core-12GB-4x-146-QUADRO-2000-RAID-/191452726998?pt=Desktop_PCs&hash=item2c9378c6d6
>(completed listing) and that $500 system has two of the excellent 2.93 / 3.33 and 12GB RAM. On Passmark the average dual X5670 scores 13509 to the dual X5650 at 11779. The 2.93 / 3.33 I think would be noticeable especialy in 3D modeling and video processing. I like the X5680 3.33 / 3.6 even more, but these are not often sold under $1,500.
Cheers,
BambiBoom
HP z420 (2014) > Xeon E5-1620 quad core @ 3.6 / 3.8GHz > 24GB DDR3 ECC 1600 RAM > Quadro K2200 (4GB)> Samsung 840 SSD 250GB /Western Digital Black WD1003FZEX 1TB> M-Audio 192 sound card > AE3000 USB WiFi > 2X Dell Ultrasharp U2715H 2560 X 1440 > Windows 7 Ultimate 64 >
[ Passmark Rating = 4032 > CPU= 9247 / 2D= 821 / 3D=3263 / Mem= 2584 / Disk= 2470]
Dell Precision T5400 (2008) > 2X Xeon X5460 quad core @3.16GHz > 16GB DDR2 667 ECC> Quadro FX 4800 (1.5GB) > WD RE4 500GB / Seagate Barracuda 500GB > M-Audio 2496 Sound Card / Linksys WMP600N WiFi > HP 2711X, 27" 1920 X 1080 and and Dell 19" LCD > Windows 7 Ultimate 64-bit >
[ Passmark system Rating = 1859, CPU = 8528 / 2D= 512 / 3D=1097]
2D, 3D CAD, Image Processing, Rendering, Text > Architecture, industrial design, graphic design, written projects