The precision 3581 is the highest performing model in the Dell Precision 3000 series of laptop workstations. While it seems almost identical to the precision 3580 on the outside, the differences are primarily internal. The main differentiators being support for Intel's 45 watt h-series CPUs, which while containing in the same number of cores as the precision three, 3480 and 3580 to higher power limits allow performance to be sustained for longer periods without reducing the speed of the CPU. On the graphics card side, there are also more powerful options with the RTX 1000 6 gigabyte or the latest generation RTX 2000 Ada to better support more complex data sets. Another graphically intensive workloads such as SOLIDWORKS Visualize rendering at 358 millimeters wide by 233 deep. It's almost the same size as the precision 3580. However, the 3581 adds a couple of millimeters to the thickness, and this is to accommodate the more powerful components, including the option of a larger 97. Watt Hour battery as a slightly higher, starting weight just under 1.8 kilograms. But despite this, it still feels pretty light in the hand port wise. We have two full USB A ports along with a HDMI three and a half millimeter jack and a wired network Ethernet port plus SD card reader. On the other side, we have two Usb-C ports, including one used to power the laptop and optionally a smart card reader for security ID. So where does the 3581 fit in the range of the last three generations? The specifications have increased, taking it more towards the mid-range and as we'll see in the performance tests, is the optimal performer of the 3000 series. The Precision 3581 still packs plenty of power for 2D and 3D CAD workflows with low thousands of parts, plus the occasional use of simulation and visualization workflows.