Supressing sound with "q" causes increase in fps inside FSX. I was surprised to see a 7 to 10 fps increase in the sim just hitting the q key. My system is a fast SB-E i7 3930K OC at 4.3, and fully ORBX'd and REXD and Accufeel, addon aircraft and what have you. MOBO is n ASUS P9X79. W7 Ultimate.Anyone else experienced this? Anything I can change to reduce the impact of sound on frames? Interestingly enough I can still hear the AccuFeel sounds without a fpsimpact, so I can still get some sound, but would be greatnto get the engines (and the frames) back.Can this be related to DirectX? Is there any proven output format for the sound that would eliminatethe fps impact?

A bit strange - i never noticed any difference in FPS with sound on or off. Something must be wrong with either hardware (sound card) or drivers. Also run dxdiag to see if your directx files are by any chance corrupt or something. There's also good chance, dxdiag will point to the source of your problem

Yeah this is another little known quirk. Are you using Sound Blaster Xi-Fi?If so, there was a driver released for it last year that had a major effect on FSX frames. Looks like the most current driver for it is even newer:Drivers

Goes back to FS9 and before if I can remember correctly.

Nope, no external sound card, just the internal audio coming with the mobo. And latest drivers since its a new mobo just installed. Internal audio its a:Realtek® ALC892 8-Channel High Definition Audio CODEC- Supports : Jack-detection, Multi-streaming, Front Panel Jack-retaskingAudio Feature :- Absolute Pitch 192kHz/ 24-bit True BD Lossless Sound- Blu-ray audio layer Content Protection - DTS Ultra PC II- DTS Connect- Optical S/PDIF out port(s) at back panelAnd no strange problems reported by dxdiag.Interestingly, the sounds coming from AccuFeel do not interfere with FPS, and they seem to be unaffected by silencing FSX internally via the "q" key.

Some onboard sounds systems use more CPU cycles than others. With that system though it should have little effect. I'd also guess that there is something not quite right with your sound system.Vic

I recall reading a long time back that landings were sometimes susceptible to lower frame rates and stuttering while ground effect sounds were being loaded just before touchdown.

I have onboard sound on my Asus P8Z68-M PRO moltherboard (Realtek® ALC892 8-Channel High Definition Audio)It doesn't make a difference in frames with sound on or off.