I have a bfg 8800gt oc.It was on another machine  (at my sister pc).She only used for docs and net and daily activities.
Now i instal the card on my fs dedicated machine.

What happens is not after one  hour, sometimes it took 3 or 4 minutes.But it also runned for 6 hours without any problems.
I have the latest nvidia drivers instaled.

What happen is: some times im in fs9 and the screen gets black and the pc blocks, i need to reboot so it cames alive again.When i get the black screen, i can see the "no signal" square.First time was like 1 hour after start the sim, then there was another time that it took 4 minutes to do the same.I runned gpu-z and the temperatures never went above 65 F and after 6 hours it was ok, with the level D 767 circling over EGLL PRO.Then after quiting fs, 4 or 5 minutes later agin the black screen.

I really dont understand, i guess if the card was damage it would not run , right? 65 F was the highest temp i saw, they say this card runs at 70 and sometimes 80 on full work.My PSU is a 450 w , and reviews say its enough.

This is the model i have:

http://images.tigerdirect.com/skuimages/large/BFG-GeForce-8800-GT-OC-B52-.jpg

Can anybody or does anybody ever had something like this.

Many Thanks all

Sorry if this sounds confusing but i really dont know what is going on

8800gt's are really good cards and can still keep up with the 200 series. It depends on the brand though. EVGA, XFX, Zotac etc. almost never turn bad. But OEM or other brands ike samsung, sony, msi, or Gigabyte may fail more often.

EDIT: A BFG card shouldn't just die often, they aren't a bad manufacture.

Too me, it easily sounds like a PSU issue (power supply). Oddly though 450w should be enough for  8XXX series, but that depends on what else is in your system.

It is not a overheating issue. 65c is normal load for a gpu. now 70c is high and 80c is maximum safe temperature for most nvidia gpu's.

Occasional for me I get a "Graphics Driver Stopped working and has restarted" error and I lose video signal for a few seconds but that has never happened in flight simulator and is a know problem with the current nvidia drivers...

Too me it sounds like a psu or a bad GPU. It could also be a bad stick of ram or your cpu getting too hot. There is really more info needed to figure this out, but I don't know what.

Could you try running a gpu stressor like Crysis on max or maybe a 3dMark bench and see if this happens again? FSX puts alot of load on the cpu and graphics and if it happens with other stressful situations it narrows it down to the GPU or PSU. Either your not getting enough power in these situations or your gpu is really bad.

Hope this helps,

Aiden

I got just today a 9800 gt.But im still puzzeled.
WHen i saw it going to the black screen, no flashes.If you take a look above temperature , i guess, is not a issue, she never goes over 65 c. I will try to lower the clocks to see if it helps.I really dont want to see this card go.
You talked about 3d aplication fail.Well once it quit on windows, thats why i though it was a temperature issue.
Thanks