After looking at the specs, it turned out that Dell was using a GK208-based (Kepler, 384 CUDA cores) variant of the GT 730. However, the DDR3 throughput on that card is a terribly low 14 GB/second. If my GDDR5 variant of the GT 730 slowed down my entire system even at CPU level, that GT 730 DDR3 would be even worse. The more typical Fermi-based variant of the GT 730 (which is actually a rebrand of the old GT 430 from 2010) would be worse still despite a wider 128-bit DDR3 memory bus (the GK208 uses a 64-bit memory bus) with higher throughput (29 GB/second for the GF108 versus 14 GB/second for the GK208 DDR3 version) because (as my previous testing has confirmed) Fermi GPUs are simply too weak to come anywhere close to fully utilize their memory bandwidth or throughput.
By the way, the XPS 8920 designation was for the XPS Special Edition with the i7. And the specs that Michael Stehly listed are just for the base configuration of that model, as offered during most of 2017. As such, that system would have required multiple component upgrades (the RAM, GPU and disk(s)), configurable at the time of ordering, just for it to even be usable in Premiere Pro.
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