Early reports suggest XPS 15 7590 still suffers from massive FPS drops while gaming
The XPS 15 is advertised as a notebook capable of both professional work and gaming. But, unless you've been living under a rock for the past few years, you've probably heard quite a bit about thermal or VRM-induced throttling as issues on the XPS 15 since its 2015 launch, which affected the XPS 15 9550, 9560, and 9570. Despite the addition of the heatsink being spread to cover the VRM as Alex Alderson recently reported, it's starting to look like the new XPS 15 7590 still suffers from sudden massive drops in framerates while gaming due to some sort of thermal issue.
The performance drops are reported   to coincide with the GPU, a GTX 1650 rated between 1455 - 1590 MHz, slowing to a crawl of just 300 MHz on the core, with framerates crashing from well above 60 to the single-digits, accordingly. The reports in the threads cited all claim similar behavior of the system: high FPS for the first few minutes or seconds following by consistent and jarring swings of terrible performance. Not many people have their hands on the latest XPS 15 7590 at this point (I am still waiting on mine to arrive), but others with the exact same problem have already chimed in on reddit; no solution seems to have been found as of yet, though Dell's official support accounts are reportedly looking into it.
If the few complaints already out by the early adopters of this new system are any indication, this would be a disappointing end to the 4th and likely last iteration of the XPS 15 using this chassis, which has remained virtually unchanged since its release in late 2015. Hopefully, Dell can further tweak the throttling point of the GPU to ameliorate this issue with a BIOS update (but not suddenly dropping the GPU throttle temperature with an irreversible BIOS update months after launch without notifying customers like they did with the 9570).