I recently recieved an XFX Radeon HD 6850 card after reluctantly switching from nVidia. My previous card was an MSI N8400GS 512MB DDR2, and wasn't up to spec with the latest games. I installed teh card using standard procedures (grounding myself, carefully removing and inserting cards etc. I have determined it isn't a problem with my setup or power supply, as my system specs exceed all of those required by the card. The only one it didn't meet was PCI-E x16 2.1, mine is on;y 2.0, but I'm told it is backwards compatible, and it wasn't listed as a requirement (only pci-e x16). I have installed the drivers from the ATi website, and uninstalled my old ones. The crd does not run hot at any time, so overheating isn't a problem.
The problem is I sometimes heat interference on the headphones, even though I'm using a separate sound card. I also get digital interference on the screen (I'm using DVI). When I try to put any kind of stress on the card (run-in tests, benchmarking, or gaming), the display driver stops responding multiple times, the interference increases, and sometimes the system halts and I have to reset. I can't think of any good reason for this problem other than a faulty card, but I bought it brand new @ factory sealed, with no modifications or over clocking. Any idea what the problem might be?