So I just built a new computer with an EVGA gtx 560 ti. I'm currently working on a 3d game as a hobby and there is one particular scene with lots of particles. When the particles emit, the card makes a very quiet, high-pitched whine that changes pitch down and up like a slide whistle until the particles are gone. It's barely audible, and I didn't notice it in other games that are more graphically intense even with the sound turned off. Maybe the fan is going faster then and covers it up? Anyway should I be worried? Is it just normal operating noise? I'm thinking capacitors, but I really don't know. I saw some people say it's a small power supply on a similar thread, but I've got power to spare
Your card renders less frames per second(Vsync matches the frames per second to that of your screen). Some people get this from the card running insanely high frame rates. Your particles must have been doing just that.