  The challenging conditions of the High-Luminosity LHC require tailored
hardware designs for the trigger and data acquisition systems. The Apollo
platform features a "Service Module" with a powerful system-on-module computer
that provides standard ATCA communications and application-specific "Command
Module"s with large FPGAs and high-speed optical fiber links. The CMS version
of Apollo will be used for the track finder and the pixel readout. It features
up to two large FPGAs and more than 100 optical links with speeds up to
25\,Gb/s. We study carefully the design and performance of the board by using
customized firmware to test power consumption, heat dissipation, and optical
link integrity. This paper presents the results of these performance tests,
design updates, and future plans.
