i5 iMac and Windows 7: Headphone jack usage makes 1 core extra crazy
I got a new iMac at the Apple Store a few days ago. The same day, I installed Vista Ultimate. Right away, I noticed that the cpu cores (in Task Manager) were in use, one at about 100%. The overall CPU Usage showed 35%. No apps in use.
To make a long story short, I never could figure it out.
So I went and bought Windows 7 Home Premium upgrade yesterday. Installed that (64-bit). Everything is great, but the cores were still going crazy.
Turns out that when I unplug my speakers from the headphone jack, it drops to 0% cpu usage! The performance didn't seem to have been affected by it, but it bothered me.
Any ideas what that was all about? Is that a driver issue on Apples part? I could assume it is because Apple doesn't support Win7 yet, but the driver cd contains lots of Windows 7 drivers, and it did the same thing in Vista.
Anyway, thanks.
iMac (Late 2009) i5, Mac OS X (10.6.2)