The ornamental design for a face panel for a CPU filler board, as shown and described.
FIG. 1 is a pespective view of the face panel for a CPU filler board viewed from a position to the left of the face panel, with the portion shown in broken line forming no part of the claimed design.
FIG. 2 is a plan view of the face panel for a CPU filler board; and,
FIG. 3 is a perspective view of the face panel for a CPU filler board viewed from a position to the right of the face panel, with the portion shown in broken line forming no part of the claimed design.