OK, I've continued rummaging around and researching, and I figure it's down to either an i7-4790K or i7-5820K...
Does Photoshop use all six cores on a six-core processor? As in, if I'm doing something "interesting" will all 12 threads be used?
And will the DDR4 memory provide significantly faster throughput than the older DDR3?
Adobe does multi-tread some feature those will use all cores
Processor CPU Mark Ttl Price (USD) [Dual CPU] Intel Xeon E5-2687W v2 @ 3.40GHz
Thanks JJMack. Now it comes down to cost... I'll have to figure out the total going both ways and see how much more the 5820 is...
The 4790 has a built-in 4600 graphics processor, so I'll have to find the Adobe list and make sure it's supported.
Yes there is cost. That why my workstation is a Dell refurbished system. For $2,500 a year ago I got. The refurb was manufactured three months before I received it. I did not have to put it together load the OS and dell will fix it for three years should it break.
Dell Outlet Precision Fixed Workstation T5600, 825W Tower
Genuine Windows 7 Professional 64-Bit Operating System DVD
Processor: Intel Xeon Dual Six Core E5-2620 Processor (2.0GHz, 15M, 7.2 GT/s,Turbo)
2GB NVIDIA Quadro 4000, Dual Monitor, 2DP & 1DVI (max resolution 2560x1600 two)
8GB, DDR3 RDIMM Memory, 1600MHz, ECC (4 DIMMS)
PERC H310 RAID Controller
256 GB Solid State Drive
500 GB SATA, 3.5 Inch, 10K Hard Drive
8X DVD +/- RW Optical Drive
Dell USB Optical Mouse
Precision T5600: 3 Year Basic Hardware Service with 3 Year
$2,029.00 Dell Outlet + $180 4TB external USB3 Disk $316 32GB ECC memory Total $2,525,00
Very nice... And an option worth checking out.