MacBook 2nd Monitor

Hello,
I have a White 13" MacBook 2Ghz, 2GB RAM, Intel Core Duo running 10.5.7
Under normal conditions, the fans run at approximately 1700 - 2000 rpm. As soon as I connect an external Monitor via the Mini DVI port (mini DVI to adaptor) the fans ramp up to 3.5 - 4k rpm and stay there.
Should this happen ?
The problem is that as soon as I open any applications and start using the MacBook, the fans then ramp to max of 6200rpm and stay there until I disconnect the external monitor....
It is a complete pain and I do not understand why it should heat up so much and be so loaded by the addition of a simple Monitor. My question is actually for another reason too, the fact that I am about to buy an Intel MacMini but as these only have a similar Mini DVI connector for the screen, I do not want to buy one if I am going to have the thing running its fans at full speed all the time.
Don´t understand any of this. I have never experienced this before when simply connecting a Monitor. I have had Macs for almost 20 years and always loved them cause of the quiet and stability compared to PCs.
Will the Mac Mini be the same when I connect a Monitor to its Mini DVI port ? The new Mac Mini has two connectors for two Monitors, will it be even worse with 2 Monitors connected ?
I had a MacMini before with pure DVI out and this was fine with a screen attached.....Seems pointless having the support for simultaneous output in the new models, if they just runs too hot after connection of even one monitor.
Thanks for any advice.

Best 27" both cheap and good is the LG
http://www.amazon.com/LG-1080p-Slim-Monitor-HDMI/dp/B00CM0QW2G/ref=sr_1_1?ie=UTF 8&qid=1386533620&sr=8-1&keywords=27%22+LG+monitor
However the 24" Viewsonic is on sale very cheap now, excellent screen
http://www.amazon.com/ViewSonic-Monitor-VX2452MH-24-Inch-LED-Lit/dp/B00EZSUVHK/r ef=sr_1_2?ie=UTF8&qid=1386533620&sr=8-2&keywords=27%22+LG+monitor

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