I keep getting this strange noise when gaming. It sounds like the HDD constantly loading but it's definitely not the HDD as I've checked it numerous times and the located the sound away from the HDD. My GPU, GTX 460, is years old now got it cheap from a friend as it was better than my old HD 6670 however it's been running fine for a year, only recently has this noise started. I would be surprised if it was my PSU as that's a couple of month old Corsair CX600M. I don't mind fans getting noisy but this sound is awful and loud enough just to put me off playing. It happens constantly when playing Guild Wars 2 and running on Auto Detect settings, but no problems on lowest settings also fine on other less graphical intensive games. GW2 on auto detect runs the GPU up to ~74C, CPU ~40C. Any idea's? Or need more info?