Well folks im gonna jump in this and you guys aren't gonna like it. I Currently took a glance at this forum and realized im like the perfect candidate for this thread.
I was using an Nvidia card with 512 on the card. Ive switched to a ATI Radeon(insert large number here) card.
I was surprised when i was gaming and getting my usual 3:1 kdr (muahaha). That my power supply would go haywire. It makes an insanley loud beeping almost as if its a post code.
So i did what almost any person would do at a first glance. I switched the power supplies and the EXACT same thing happened. Only then did i finally realize that my vid card has been draining the crap out of my powersupply making to the point of almost melting. I even put a thermometer up to it and recorded a temp of 102 degrees.
My personal opinion, granted its not much being pretty inexperienced to you guys, i would DEFFINITLY take Nvidea over ATI, any day of the week.