This may explain some of the unexpected performance differences between the MacBook Pro 14 (16GB) with the iMac (48GB) given that they have the same processor. Apple has improved the graphics optimization so that it doesn't under- or over-allocate GPU resources, but if you've only got 8GB UMA memory there's really no headroom for the CPU and GPU to share the memory if you're slamming them both. I think some aspects of the configuration's performance are memory bound in other words, too little memory may hold it back because of the unified memory architecture. All the charging connections are on the left.