I was wondering which is better for a video CARD Nvidia or ATI? nvidia all the way. thats why i got two in my machineI've always had better luck with Nvidia.Same Here.

I am also aware with a some problems with a few games with ATI.It's all about which cards you are talking about.
Any topic like this will always attract nonsensical replies with people claiming one brand is better.
This may be true, however only for a short period of time - one brand never dominates for LONG, and hopefully never will.Excellent points...September 12, 2008 Windows IT Pro Mag

nVidia In Hot Water Over Faulty Chips
Ever had one of your systems complete fail because of a faulty nVidia graphics card? As it turns out some of their cards are bad and can seriously overheat a system.
According to a story at the Inquirer, it's the G84 and G86 chips that have a problem. nVidia took a big financial write-off over the problem and now a New York law firm has filed a class action lawsuit on behalf of shareholders, alleging that nVidia knew about the problem but kept it under wraps.

This doesn't precisely relate to a security problem, unless you consider the fact than overheated system COULD also crash a drive thereby causing you to lose your data.

In fact, I have 2 Dell laptops that experienced this exact problem, but with a different chipset. Those particular systems had the nVidia GeForce 7900 card in them, which I believe uses a G71 chipset. One of the systems became so hot that the plastic cover on top of the system actually warped due to the heat. The WiFi card was rendered inoperable as well. The other system simple STOPPED displaying video. I'm not sure who's at FAULT with this: Dell (for not providing an adequate BIOS to control heat) or nVidia. Either way there's no relief from either company for those problems.

Spoiler talking
I have alway had good luck with Nvidia and I would buy from them again. I did want to post the story so you can be more informed.