Intel's Compute Card (https://www.intel.com/content/www/us/en/compute-card/compute-card-brief.html https://www.intel.com/content/www/us/en/compute-card/compute.

Intel's Compute Card (https://www.intel.com/content/www/us/en/compute-card/compute-card-brief.html https://www.intel.com/content/www/us/en/compute-card/compute...) was supposed to be something like what you describe, except that the CPU and RAM were included as well. Never took off because it was too expensive.