Re: I hope it is heat tolerant
A standard Nvidia Geforce GPU on factory settings has its fan set to keep the temperature at or below 90C (although Maxwell is a lot more efficient so the newer ones may try to keep to lower temperatures). The danger temperature not to be exceeded is generally around 110C. So no, 55C is not anywhere near enough for any kind of worry. In fact, it's closer to normal idling temperature than anything else. As others have mentioned, actual engine temperatures are likely to get higher than that so it's not quite simply a case of sticking a bog standard consumer GPU in there and assuming it will work, but "my car sometimes feels a bit hot" is really not any kind of sensible worry about whether in-car computers will have problems.