I have started experiencing major sound distortions in FSX, I think FSX only, since I cannot reproduce it in FS9 nor in any other videos, sound clips etc. The distorted sound appears to be in addition to the engine noise

I did some more testing following discussions with my dealer. With each kit of RAM (ie 2x1GB) things work fine but when I put the two kits in, ie 4MB I got this horrible noise; changing slots for the RAM did not resolve it.So next step was to remove my sound card and use on-board sound, but I could not activate my on-board sound! Seems like my mbo might be faulty.My dealer lent me another sound card and bingo! my distorted sounds have gone. So I don't quite know what pushed my sound card over the edge when I increased my RAM to 4GB.I should get another sound card, but a conundrum - is it worthwhile getting GigaByte to check the mbo while still under warranty when I don't want to use on-board sound anyway. This is the third GigaByte mbo I have had trouble with over the years but my dealer assures me they are no worse than the other top manufacturers Asus and Abit.Nigel

Eventually that's going to be a fine hand-me-down. Then, that onboard sound is going to be needed. Wait 'til the last month, then send it in. You'll get their latest and greatest revision of that board.. . . or if you bought it with a credit card, RMA it to the CC company a month After the warranty expires. They'll just send you a check.