Graphics card causing flicking?

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Hello I have a older computer I use for playing older games and I am having a strange flicking issue with the 9800 GTX+ here is a short video of the issue in need for speed underground 2.

 

 

 

I have only tried the card on two games, NFS2 and Oblivion (Oblivion was fine) I also tried running a few benchmarks playing on a loop and have no issues. I ran Tropics 2008, 3DMark06 and 3DMark Vantage.

I have used DDU to uninstall drivers and used even tried a clean install of windows to make sure.

When I remove the 9800GTX+ and put in my 9600GT reinstall the driver the need for speed underground 2 does not have the flicking issue. but removing the 9600GT and putting the 9800GTX+ in the issue returns but again it is fine in Oblivion, Tropics 2008, 3DMark06 and 3DMark.

The Card is also not overheating and I have applied new thermal paste (MX4) and new thermal pads.

Motherboard: EVGA nForce 680i SLI
CPU: Intel E8300
Graphics card PNY 9800 GTX+ 512mb
PSU: EVGA 600W BR 80+ bronze (50A 600W +12v)