I've recently acquired a PS1 SCPH-1001 model with a modchip in it. I am considering switching it over to being my main PS1. However, I noted that it gets very warm on the left side of the system, even when it's off. Is this model known to overheat? How much playtime can I get before it does?

It seems to be working correctly...but the heat is worrisome. My SCPH-7501 does not get warm at all, even after playing it for over an hour, and my PSone doesn't get that hot either.