The memory ceiling is 128GB of standard or, for Xeon models, ECC DRAM. Storage can be expanded to 6TB, and the top screen choice is a 4K (3,840-by-2,160) touch panel with OLED technology for even inkier blacks and more dazzling colors. Thread junkies can opt for the eight-core Core i9-9880H instead of the Xeon.
No lightweight at 5.5 pounds, the P53 measures 1.2 by 14.9 by 9.9 inches. That slightly undercuts the HP ZBook 15 G5's 5.8 pounds and 1 by 14.8 by 10.4 inches, but it's huge next to something like the 15-inch Apple MacBook Pro (4 pounds, 0.6 by 13.8 by 9.5 inches). The Lenovo has passed a dozen MIL-STD tests for durability, so there's almost no flex if you mash the keyboard or grasp the corners of the thick-bezeled screen.