So it's the same scenario with Resolution 800x450 and no bloom
Ram was never an issue, I checked periodically and didn't see anything higher than 16gb. It fluctuated about from about 14.5gb - 16gb
I do notice that core usage between the two Xeons is not consistent. One Xeon suffers low usage. Multi-cpu support seems iffy. It seems to suffer in rendering. The dual CPU setup is very comparable to my current CPU. The benchmark, at normal resolution, only takes about 13-14 minutes on my home system. In fact at full resolution the dual xeon is performing a little slower than the A10-5800k at 4c/4t.
<<<### APP RUN STARTED ###>>>
Terragen 4 build 4.4.44
Licensed to Jordan Thompson
Receiving maintenance until 2020-08-13
Maintenance days remaining: 270
No EDD key
License key file: Set by an administrator
Found license for Professional Edition
Found 24 processor cores
Using 24 processor cores
Loading plugins in: /home/was/Terragen/TG-44440-Node/
No files matching *.tgp in this directory
Loaded 0 modules in this directory
Loading plugins in: /home/was/Terragen/TG-44440-Node/
No files matching *.cpp in this directory
Loaded 0 modules in this directory
Loading plugins in: /home/was/Terragen/TG-44440-Node/plugins/
Loaded 3 modules in this directory
Loading plugins in: /home/was/Terragen/TG-44440-Node/plugins/
No files matching *.cpp in this directory
Loaded 0 modules in this directory
Loading plugins in: /home/was/Terragen/TG-44440-Node/../../tgdplugins/
No files matching *.tgp in this directory
Loaded 0 modules in this directory
Loading plugins in: /home/was/Terragen/TG-44440-Node/../../tgdplugins/
No files matching *.cpp in this directory
Loaded 0 modules in this directory
Loading plugins in: /home/was/Terragen/TG-44440-Node/../../tgdplugins/linux_intel/
No files matching *.tgp in this directory
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Loading plugins in: /home/was/Terragen/TG-44440-Node/../../tgdplugins/linux_intel/
No files matching *.cpp in this directory
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Loaded a total of 3 plugin modules
ReadXML: Attempting to read file: "/home/was/Terragen/Projects/TG4Bench/terragen-4-benchmark_v1.0-nobloom.tgd"
Content path for children of "/Billboard_Dune.tgo" set to "Project_Assets/"
trImage attempting to read file Project_Assets/grijshout-small.jpg
trImage attempting to read file Project_Assets/Dunes-Valley.jpg
trImage attempting to read file Project_Assets/Dunes-Valley.jpg
Content path for children of "/Pop tundraheather-2.tgo/tundraheather-2.tgo" set to "Project_Assets/"
trImage attempting to read file Project_Assets/heidetakje-bloei-small.png
trImage attempting to read file Project_Assets/heidetakje-bloei-small.png
trImage attempting to read file Project_Assets/heidetakje-3+alpha.png
trImage attempting to read file Project_Assets/heidetakje-3+alpha.png
trImage attempting to read file Project_Assets/heidetakje-2+alpha.png
trImage attempting to read file Project_Assets/heidetakje-2+alpha.png
trImage attempting to read file Project_Assets/heidetakje-bloei-small.png
trImage attempting to read file Project_Assets/heidetakje-bloei-small.png
Content path for children of "/Pop bush_5m--v1.tgo/bush_5m--v1.tgo" set to "Project_Assets/"
trImage attempting to read file Project_Assets/lijsterbes-blad-herfst.png
trImage attempting to read file Project_Assets/lijsterbes-blad-herfst.png
trImage attempting to read file Project_Assets/bushbark.jpg
trImage attempting to read file Project_Assets/lijsterbesblad-groen.png
trImage attempting to read file Project_Assets/lijsterbesblad-groen.png
Content path for children of "/Pop pijpestro_27-08-13_v2.tgo/pijpestro_27-08-13_v2.tgo" set to "Project_Assets/"
trImage attempting to read file Project_Assets/pijpestro-aar-opp1.png
trImage attempting to read file Project_Assets/pijpestro-aar-opp1.png
trImage attempting to read file Project_Assets/pijpestro-aar_opp.png
trImage attempting to read file Project_Assets/pijpestro-aar_opp.png
ReadXML: done
Content path for children of "Project" set to "/home/was/Terragen/Projects/TG4Bench/"
Starting render...
Output filename (-o) = ./800-400_no-bloom.tif
No -f specified, so rendering the project's current frame
Preparing to render frame 1
Number of buckets: 12 x 7 between 24 threads
Largest bucket size: 107 x 103
TGOReader: Attempting to open file: /home/was/Terragen/Projects/TG4Bench/Project_Assets/Billboard_Dune.tgo
Billboard_Dune.tgo: Loaded 444 triangles, 0 particles
TGOReader: Attempting to open file: /home/was/Terragen/Projects/TG4Bench/Project_Assets/tundraheather-2.tgo
tundraheather-2.tgo: Loaded 51744 triangles, 0 particles
33507 objects loaded from instance cache for "Pop tundraheather-2.tgo"
33507 objects (1.73 billion triangles) inserted by Populator "Pop tundraheather-2.tgo"
TGOReader: Attempting to open file: /home/was/Terragen/Projects/TG4Bench/Project_Assets/bush_5m--v1.tgo
bush_5m--v1.tgo: Loaded 121247 triangles, 0 particles
2134 objects loaded from instance cache for "Pop bush_5m--v1.tgo"
2134 objects (0.259 billion triangles) inserted by Populator "Pop bush_5m--v1.tgo"
TGOReader: Attempting to open file: /home/was/Terragen/Projects/TG4Bench/Project_Assets/pijpestro_27-08-13_v2.tgo
pijpestro_27-08-13_v2.tgo: Loaded 31080 triangles, 0 particles
17947 objects loaded from instance cache for "Pop pijpestro_27-08-13_v2.tgo"
17947 objects (0.558 billion triangles) inserted by Populator "Pop pijpestro_27-08-13_v2.tgo"
Starting pre pass
Rendered 100% of pre pass
Starting final pass
Number of buckets: 12 x 7 between 24 threads
Largest bucket size: 107 x 103
Rendering final pass... 0:00:30s, 0% of final pass, 0 micro-triangles
Rendering final pass... 0:01:00s, 0% of final pass, 0 micro-triangles
Rendering final pass... 0:01:30s, 0% of final pass, 0 micro-triangles
Rendering final pass... 0:02:00s, 0% of final pass, 0 micro-triangles
Rendering final pass... 0:02:30s, 7% of final pass, 97512 micro-triangles
Rendering final pass... 0:03:00s, 9% of final pass, 129659 micro-triangles
Rendering final pass... 0:03:30s, 13% of final pass, 177791 micro-triangles
Rendering final pass... 0:04:00s, 14% of final pass, 193995 micro-triangles
Rendering final pass... 0:04:30s, 14% of final pass, 193995 micro-triangles
Rendering final pass... 0:05:00s, 14% of final pass, 193995 micro-triangles
Rendering final pass... 0:05:30s, 14% of final pass, 193995 micro-triangles
Rendering final pass... 0:06:00s, 15% of final pass, 214094 micro-triangles
Rendering final pass... 0:06:30s, 17% of final pass, 258162 micro-triangles
Rendering final pass... 0:07:00s, 22% of final pass, 404830 micro-triangles
Rendering final pass... 0:07:30s, 26% of final pass, 546236 micro-triangles
Rendering final pass... 0:08:00s, 32% of final pass, 688827 micro-triangles
Rendering final pass... 0:08:30s, 32% of final pass, 688827 micro-triangles
Rendering final pass... 0:09:00s, 33% of final pass, 776360 micro-triangles
Rendering final pass... 0:09:30s, 33% of final pass, 776360 micro-triangles
Rendering final pass... 0:10:00s, 38% of final pass, 1002786 micro-triangles
Rendering final pass... 0:10:30s, 40% of final pass, 1148230 micro-triangles
Rendering final pass... 0:11:00s, 44% of final pass, 1360359 micro-triangles
Rendering final pass... 0:11:30s, 46% of final pass, 1427838 micro-triangles
Rendering final pass... 0:12:00s, 48% of final pass, 1492021 micro-triangles
Rendering final pass... 0:12:30s, 52% of final pass, 1606176 micro-triangles
Rendering final pass... 0:13:00s, 55% of final pass, 1716406 micro-triangles
Rendering final pass... 0:13:30s, 58% of final pass, 1785318 micro-triangles
Rendering final pass... 0:14:00s, 59% of final pass, 1817142 micro-triangles
Rendering final pass... 0:14:30s, 61% of final pass, 1892890 micro-triangles
Rendering final pass... 0:15:00s, 64% of final pass, 1945688 micro-triangles
Rendering final pass... 0:15:30s, 69% of final pass, 2066424 micro-triangles
Rendering final pass... 0:16:00s, 70% of final pass, 2100663 micro-triangles
Rendering final pass... 0:16:30s, 72% of final pass, 2156434 micro-triangles
Rendering final pass... 0:17:00s, 75% of final pass, 2211587 micro-triangles
Rendering final pass... 0:17:30s, 84% of final pass, 2421976 micro-triangles
Rendering final pass... 0:18:00s, 85% of final pass, 2448288 micro-triangles
Rendering final pass... 0:18:30s, 91% of final pass, 2565410 micro-triangles
Rendering final pass... 0:19:00s, 95% of final pass, 2633242 micro-triangles
Rendering final pass... 0:19:30s, 98% of final pass, 2712385 micro-triangles
Rendered 100% of final pass
Process2dPostEffects...
free(): invalid next size (fast)
Aborted (core dumped)
Have you looked into the error and use of C regarding the step?