No sound in Mulitplayer, sound works in SP fine.....

[Ataros]

Check your power management settings. Go to advanced settings and check that you have NO powersaving options ON.

I use Gamebooster which has an option to set Gaming PowerPlan that disables any powersaving.

I have heard that someone experienced a screensaver pop up while CoD was running. It might be the same with powersaving options switching on. And guess it would be hard for a PC to handle this sim if hardware is underpowered.

ps. Make sure you run 550W+ PSUs at least or greater depending on your videocard power consumption.