Have you guys checked out the new hardware monitor 4.0 yet? Apparently, on my iMac Core Duo (yonah) it has a new sensor called "graphics processor temperature diode". Originally, I thought there wasn't a temp monitor for the iMac's x1600. Anyhow, I'm getting 59C (138F) at idle, which is pretty hot, compared to a cpu temp of about 25C/28C at idle. Given such a high gpu temperature at idle, is it safe to overclock the graphics chip at all? What gpu temperatures have you guys been getting on your imacs?