What's a safe videocard temperature?

[Avalach21]

haha i know someone is going to call me a retard, but here we go

 

I got a dell inspirion e1705 a little over a year ago for 1500 or so dollars.

It's a laptop.

 

It's got 2.0 ghz core2duo

2 gb of RAM

and a go7900GS

 

It's been pretty good to me, but there were some games it couldn't run well enough, and I'd actually wanted to play them

Bioshock for example would give me like 20-30 fps with everything on low (except i kept high detail shaders on) at 1024x768 resolution.

 

So I just flashed my bios, and unlocked my videocard, and now I overclocked it from 375mhz core 500mhz memory to 580 core 730 memory.  I'm not getting any artifacts, and everything's running fine.  My FPS have skyrocketed in Bioshock.  I have everything on high, i think i had my resolution at 1600x1200 and I'm getting 30-60+ fps at all times.  I'm getting great performance in other games too (Call of Duty 4, Supreme Commander...  Crysis hasn't seemed to budge tho... it must be dominating my video card AND my CPU)

The problem is my card can get up to 80 degrees, I think it actually got up to 84 at one point...

Well I have 2 programs, one is Dell Inspirion Fan Control v 3.1

and then I'm using ATI tool. ATI tool always has like, an 8 degree higher reading than my other program, and I don't know which one to trust. (ATITool is the one giving me the 80+ temp readings)

but anyways.  Someone can call me a retard for overclocking a laptop videocard, but my performance is incredible!

Is this incredibly unsafe to run at these temps?  Again, I'm not getting any artifacts, my systems running stable.  Is there any other cooling method I can use for my laptop?