the idea of gaming on a pc is have as high as possible fps
temperature, no ,the ram won't work hotter, that parameter depends on how is the airflow in your cpu, how many fans pushing air in and pulling air out you have
ram is meant to tollerate use and abuse, a dead ram module can happen but is very uncommon, i haven't experienced it yet with my pcs, and i have pcs since 20 years ago, perhaps longer
if you can, buy more ram and enjoy your games with as much fps as possible