My Geforce 2 mx400 64MB AGP card is coming in at 52C, just in Windows, no games. I have the thermal sensor on the back of the card, near the chipset (the chipset is on the front though). The card came with just a heatsink.

Is this a normal temperature? How hot should this card be when playing 3D games, and how hot can it get before it burns up?

AOpen HQ45 w/300watts
SL75KAV-X w/snd
AMD T-bird 1GHz @ 1.14GHz (133x8.5)
128MB PC100
GeForce 2 mx400 64MB AGP w/TVOUT
Delta 12x/40x DVD
56x CDROM (for sale)
Windows 98