I recently got my Diamond 4890 XOC video card back from RMA. I happy to find that it can OC to 1000Mhz/1075Mhz and the temps stay below 80C. It makes a strange noise whenever I enter 3D applications. The sound starts the second that I click "start game" and stops the second I click "quit game". It happens the same when it's overclocked or not. It benchmarks well. I can't find where the sound is coming from, it's not coming from the fan. Does anybody have any suggestions of what the sound might be or how to test it.
It's hard to describe. It's not a whine. It's like scratching your fingernail across a table or desk, but it's a constant "pitch". I've opened the case and looked around, but I can't find where exactly it's coming from.