Nvidia 9800 GTX+ overheating?

I've been having some problems with my 9800 GTX+ lately... I've been getting random crashes during games where the monitor turns black, the power light on the monitor starts blinking and the sound hangs, and I have to reboot. I thought it might be the monitor but I think the sound wouldn't hang if that was the case. I figured it was the GPU so I ran a hardware monitoring program and my GPU temp during Orcs Must Die, which is not a very demanding game, got to about 110c after just 45 minutes of play on medium settings. I don't know what temp might crash the PC but I imagine it can't be too much higher than that. Up until now my comp has handled everything I've tried to play perfectly. I started having the problem every now and then but now it crashes every time I try to play a game.

I cleaned the dust off the card and inside the tower and that lowered my idle GPU temp from 60 to 50, but it still gets ridiculously hot and crashes when playing. I've also tried manually setting the fan speed to 100% but that doesnt make a difference either. I dont think it's a case cooling issue since I cleaned out the dust and before now I've been playing everything perfectly fine. Air flow inside the case seems to be ok...I can't imagine what else would cause problems like this other than really high GPU temperature. Is that what you guys think it is? If so, what should I do?
Here's my specs:

Gigabyte EP45-UD3R
Vista 64-bit
4gb corsair DDR3
Intel Quad 6600
450W Antex PSU (I checked the voltages, not that either)

more info in the gpu:

0301 - Card Name : NVIDIA GeForce 9800 GTX+
0302 - Manufacturer : NVIDIA
0303 - Chip Type : GeForce 9800 GTX+
0304 - DAC Type : Integrated RAMDAC
0305 - Device Key : Enum\PCI\VEN_10DE&DEV_0613&SUBSYS_C8793842&REV_A2
0306 - Display Memory : 2286 MB
0307 - AdapterRAM : 512.00 MB
0308 - Current Mode : 1280 x 1024 (32 bit) (60Hz)
0309 - Monitor Name : Generic PnP Monitor
0310 - Driver Name : nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll,nvd3dum,nvwgf2um,nvwgf2um
0311 - Driver Version : 8.17.0012.8562
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More about nvidia 9800 overheating
  1. One more test. Take off the side panel and take a house fan turn it on high and do your test and see if it helps. Have you tried other temp programs? Like MSI Afterburner? After you do repost your findings.

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