3DMark
We used 3DMark's ‘Fire Strike' benchmark, which is designed to test the performance of gaming systems. Our primary comparative testing used the Normal setting, but we also ran the Extreme and Ultra modes to reveal how this system would cope with running games at its native screen resolution. Extreme bumps the resolution up to 2,560 x 1,440, whilst Ultra operates at 3,840 x 2,160, also known as 4K.
In Full HD, the overall score of 3,932 is decent, but it's clearly behind our two comparisons. Whilst the latter two provide excellent performance for a laptop, the Dell XPS 15 is merely good.
These results imply that most recent games won't be playable above 1,920 x 1080, and 4K (used by the Ultra test) will be particularly out of the question. We will test this again with specific game titles later in this article.
@James Morris, did Dell confirm support for eGPU enclosures through that Thunderbolt 3.0 port? Merely having the port isn’t enough, system BIOS level support is also needed for it work.