HP lists this spare part number for the HP ProBook 465 G11 in its Maintenance and Service Guide (printed p.40).
Source notes
HP Maintenance and Service Guide for the HP ProBook 465 G11 (Document Part Number N81604-001), spare parts table, printed p.40: "graphics subsystem with discrete memory N96459-001". Read from the cached HP manual (via FDY-MM-015-R1).