I think putting old hardware in a new box is just not often worth it… likely something is going to have to slow down or some compromise is made in this case I think going back someone commented that the OP had a nice primary gpu so why risk any interactions or issue… I suspect if DT got cleaned up after all the tinkering that has been done… ie being sure to also clear out all the config files and files in the cache and appdata etc… pull the old GPU, look for the opencl compatibility pack and delete that reinstall DT and it will be off to the races…
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