Noisy fans kicking in with the new RAM upgrade

Hello, today I installed 8gb of RAM replacing the 2gb I previously had (both were 4 sticks). I placed a pair on each board and it all seems to work fine.... then while I am sitting in the other room, it sounds like the computer is about to launch itself.... yes it was my computer and not a fancy truck outside... so it seems that for the first time, the machine decided it needed extra cooling. it lasted about a minute. and according to my wife happened a few times today.
I expect this is ok.... but is it? does 8gb RAM really generate more heat? Could I have done something wrong? System profiler reports all is well and as expected...
Thanks for any words of wisdom or advise...

Play with smcfan to see - a 200 rpm boost like 800 is just enough, 1000 and you can start to hear it clearly but mild. Prevents heat from building. When it goes into sleep, that allows the heat to build up and not get pushed out, so it may run wild for 10-45 seconds on wake from sleep from time to time, and perfectly safe and normal, even healthy.
(There was an SMC firmware update in Sept '07 to improve and correct SMC and fan behavior.).
There are more pages with tips on how to test memory, but start with Apple Hardware Test; run Rember or Memtest; and monitor temps with something. Sys Profile will tell you - since last boot - if there are errors of any kind.
Good airflow and the back side really needs a place for all that very hot air to go, even more so in the summer (unless you keep the room icy) is critical.

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