   Strange Sound When Rendering
  I can't imagine why this would happen, but here's what's going on.I've noticed that when I was doing OpenGL on Linux, and now using SlimDX, that when doing any rendering, my computer is making a high pitched but quiet squealing/sizzling sound.This doesn't happen when running games, and it hasn't happened when I was using native DirectX or SDL or anything.I'm sure it's not a hard drive or a fan making the sound. I'm not doing any read/write operations so the hard drive isn't being used.Anyways, it doesn't sound normal or good, so I was wondering if anyone knew what this might be?   
  Not sure, but does it happen when v-syncing, presenting immediately or both?   ;  My graphics card does the same thing for over 2 years now and still hasn't started burning, so I guess it's not critical.No idea what it is, though... not all applications do it, and it is not limited to OpenGL, for example SciTE produces the noise when marking a selection with the mouse.   ;  Same thing here - again, no idea why. I've never been sure where the sound was coming from either. It does seem to be related to the movement of the mouse though.Would be cool to finally get to know what it is though :P;  Interference somewhere inside the machine. Unshielded cabling?   ;  Hmmm...  Does your graphics card have a fan on it?  It could be the sound of the fan you're hearing.   ;  It's definitly not coming from the monitor or anything? I guess you're all probably not using CRT monitors anymore?   ;Quote:Original post by ViLiONot sure, but does it happen when v-syncing, presenting immediately or both?Hmm... I set PresentationInterval to Immediate and I get the sound, but if I set it to 'One' (not entirely sure what that means), the sound goes away. Also, if I minimize the rendering window and then bring it back up, the sound goes away.Does that tell you anything?EDIT: It's not the fan and I wouldn't think it would be interference because this sound isn't made when playing games. It's only done this since I've been using SlimDX (it didn't happen with native DX). I'm using an LCD monitor.   ;  What frame rate are you getting in your application? I notice a sound like this if I set up something that presents very frequently (like an almost-empty test app, over 1000fps) but seems to go away for more reasonable frame rates.L-   ;Quote:Original post by UphoreumQuote:Original post by ViLiONot sure, but does it happen when v-syncing, presenting immediately or both?Hmm... I set PresentationInterval to Immediate and I get the sound, but if I set it to 'One' (not entirely sure what that means), the sound goes away. Also, if I minimize the rendering window and then bring it back up, the sound goes away.Does that tell you anything?Setting it to One means you are syncing present to your monitors refresh, setting it Default also tries to v-sync, but does so in a cheaper less accurate way so usually doesn't quite achieve a 1-1 with your monitor refresh.As for the noise, I had the same sort of thing with both my old 6600gt and my new 8800gt. No idea what causes it other than it definitely being the graphics card and it doesn't really bother me as it only surfaces when rendering at nonsensically high framerates [smile]Regards,ViLiO   