If you google "video card max temp" it tells you that Nvidia gpus top out at 105c, probably about the same for AMDs. If you aren't getting artifacts or performance problems perhaps you'll be ok for a while. I had an xfx radeon hd 6870 that started getting up near 90c and it didn't last long before it just died completely. I know that's not what you want to hear but it was probably just because I had a crappy xfx card. Thermal pastes can go bad with time, bearings in fans can go causing slower fan rotation. They sell aftermarket gpu coolers, most these days are liquid systems with a radiator. I have seen non-liquid ones in the past, but I'm not sure if they still exist. It's all about how much time and work and research and money...