External LCD w/ Macbook - Immediate 20-25C rise in temps

[aphexii]

I know that using an external LCD taxes the integrated video quite a bit (2.2ghz Santa Rosa Macbook), but I've been shocked at how much the temps rise (and subsequently causes the fan to run).

Without my external 24" LCD connected my Macbook is stable around 36-38C, but the moment I connect it my temps immediately jump (within 10-15 seconds) to around 60C. Within 2-3 minutes the temp stabilizes around 64-66C, under nearly no load.

Under load (ripping DVD's, etc), temps regularly get around 90-91C.

Anyone else?

 

[Andrew K.]

I notice my Aluminum macbook heats up faster when connected to my 24 inch Dell, how did you check the temp? I have to open mine up because the keys get hot when closed and I don't know what it will do to the glass screen.

 

[aphexii]

I notice my Aluminum macbook heats up faster when connected to my 24 inch Dell, how did you check the temp? I have to open mine up because the keys get hot when closed and I don't know what it will do to the glass screen.

iStat Pro

 

[andrewag]

I just did a test on both of my MacBook's. They were both plugged into a 20" ACD via DVI. Temperatures are of the CPU Die.

MacBook Core Duo 2GHz 2GB RAM GMA950 (it was booted from being off for over a day):

Without display - 35.8c
With display - 37.8c

MacBook Core 2 Duo (aluminium) 2.4GHz 2GB RAM Nvidia 9400m (used lightly for around 15 mins before test):

Without display - 41.6c
With display - 43.9c