Nvidia geforce 9800gt Dying?

Ok so garrysmod (hl2 game) and call of duty black ops are all experiencing
this graphic glitch where all the textures seem to misplace them self
everythings fine and dandy for about 30 secs of gameplay then a sudden flash and everything changes to the image below



http://img132.imageshack.us/img132/8555/vidcard.jpg

also every bsod i've had relates to nv4_disp.dll

Code:

On Fri 2/25/2011 9:02:04  PM GMT your computer crashed
crash dump file:  C:\WINDOWS\Minidump\Mini022511-01.dmp
This was probably caused by the  following module: nv4_disp.dll (nv4_disp+0x4A8139) 
Bugcheck code:  0x10000050 (0xFFFFFFFFF6DB4988, 0x1, 0xFFFFFFFFBD4BA139, 0x2)
Error: CUSTOM_ERROR
file path:  C:\WINDOWS\system32\nv4_disp.dll
product: NVIDIA Compatible Windows 2000 Display driver, Version 266.58  
company: NVIDIA  Corporation
description: NVIDIA Compatible Windows 2000 Display  driver, Version 266.58 
A third party driver was identified as the probable  root cause of this system error. It is suggested you look for an update for the  following driver: nv4_disp.dll (NVIDIA Compatible Windows 2000 Display driver,  Version 266.58 , NVIDIA Corporation). 
Google query: nv4_disp.dll NVIDIA Corporation  CUSTOM_ERROR




On Thu 2/24/2011 4:19:30 PM GMT your computer  crashed
crash dump file: C:\WINDOWS\Minidump\Mini022411-01.dmp
This  was probably caused by the following module: nv4_disp.dll (nv4_disp+0x8F27B) 
Bugcheck code:  0x1000008E (0xFFFFFFFFC0000005, 0xFFFFFFFFBD0A127B, 0xFFFFFFFFAD797B68,  0x0)
Error: KERNEL_MODE_EXCEPTION_NOT_HANDLED_M
file path:  C:\WINDOWS\system32\nv4_disp.dll
product: NVIDIA Compatible Windows 2000 Display driver, Version 266.58  
company: NVIDIA  Corporation
description: NVIDIA Compatible Windows 2000 Display  driver, Version 266.58 
Bug check description: This indicates that a  kernel-mode program generated an exception which the error handler did not  catch.
This appears to be a typical software driver bug and is not likely to  be caused by a hardware problem. 
A third party driver was identified as the  probable root cause of this system error. It is suggested you look for an update  for the following driver: nv4_disp.dll (NVIDIA Compatible Windows 2000 Display  driver, Version 266.58 , NVIDIA Corporation). 
Google query: nv4_disp.dll NVIDIA Corporation  KERNEL_MODE_EXCEPTION_NOT_HANDLED_M




On Mon 2/14/2011 9:36:03 PM GMT  your computer crashed
crash dump file:  C:\WINDOWS\Minidump\Mini021411-01.dmp
This was probably caused by the  following module: nv4_disp.dll (nv4_disp+0xAD3E2) 
Bugcheck code:  0x1000007E (0xFFFFFFFFC0000005, 0xFFFFFFFFBF0BF3E2, 0xFFFFFFFFB0FEF38C,  0xFFFFFFFFB0FEF088)
Error: SYSTEM_THREAD_EXCEPTION_NOT_HANDLED_M
file path:  C:\WINDOWS\system32\nv4_disp.dll
product: NVIDIA Compatible Windows 2000 Display driver, Version 266.58  
company: NVIDIA  Corporation
description: NVIDIA Compatible Windows 2000 Display  driver, Version 266.58 
Bug check description: This indicates that a system  thread generated an exception which the error handler did not catch.
This  appears to be a typical software driver bug and is not likely to be caused by a  hardware problem. 
A third party driver was identified as the probable root  cause of this system error. It is suggested you look for an update for the  following driver: nv4_disp.dll (NVIDIA Compatible Windows 2000 Display driver,  Version 266.58 , NVIDIA Corporation). 
Google query: nv4_disp.dll NVIDIA Corporation  SYSTEM_THREAD_EXCEPTION_NOT_HANDLED_M

Garrysmod runs at 300fps

just before the glitch happened on call of duty my framerate was going wild from 60 to 20 in really fast drops
it was like network lag but graphics instead

Hello there.

If you have the latest drivers. please uninstall them, run driver sweeper and then reinstall the latest ones. It could also be that your GPU is dying.

Do you get this behavior without playing any games? HD content streaming, Movies?

Nope only when playing games
the first time it happened was actually about 6-7 month ago on gmod and it was a one off occurrence
but now it seems to be alot more frequent

Hi. Im still running windows XP and I've been having the same exact issues with Sims 3. My game looks exactly like your picture with the graphics, flickering, screen sometimes turning white or black, checkered screens.
I even get a bunch of nv4_disp.dll BSOD's
0x00000050
0x000000EA
0x0000000A

I've even replaced the graphics card with a new one, the same version, Nvidia 9800GT, and Im still getting the same issues. I've installed a new CPU with a better fan, I've tried changing the game to various diffrent settings even though I used to be able to play perfectly on all the highest settings. I've forced V-sinc on, Ive tried playing in window mode. Still, the same problem. I dont know what the heck is wrong.

Try changing drivers I guess that's ur best bet go into device manager and uninstall/reinstall your display driver