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I have a HP Z-640 too that is my PI machine.
Its specs are
Dual Xeon E5-2680 v4's (28c/56t total)
256GB DDR4
12Gb nVidia Titan Xp.
512GB SSD for boot/windows
Pci-e riser with 4x2tb nvme SSD's for storage/processing swap etc.
Including the Titan XP and nvme hdd's etc it was less than $1200... and in PI, its ridiculous. WBPP full pipeline including normalisation, calibration, image solving, integration and drizzle integration usually takes less than 1hr for 3~400 subs, and less than 10 minutes for preliminary stacks of 56 or less images (56 individual threads means each operation runs in parallel if I have less than 56 subs)
The Titan Xp GPU pumps through Blur/Noise/Star Xterminator or Graxpert in a matter of seconds too...
I literally couldn't think of a better machine for PI. I'd love to get a pair of 2699's for it, just to boost that thread count and and base speed up a little - but I think the 28c 56t at 2.4GHz base, 3.3GHz boost is plenty..
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