Avoid overclock after ram upgrade on MBP late 2009

Hi guys, I'm from italy so please accept my poor english.
The problem is the following:
I installed a couple of 4gb ram 1066 (together with a 256 SSD) and all works fine but after the upgrade the computer heats very easly.
It reaches temperatures of 70-80° (celsius) if cpu usage goes over 50-60%.
I managed it with smc-fan-control, even if it is not namely correct.
Today I was editing a video in iMovie and I recognised that in activity monitor the cpu usage wass telling 170% with respect to iMoive process.
Is it possible???
iStat pro always tells me max 100%, but probably it's wrong because if really an overclock occured it explains my problems of temperatures after the upgrade.
Moreover, I never see a RAM usage more than a couple of Gb, so it seems that the ram is recognised, but not used properly!!
Running iBench the ram seemed to be used a lot, well above 6Gb.
Please help me

No overclocking going on. You have a dual core cpu which can have 200% cpu activity, 100% for each core. 100 + 100 % equals 200%.
Yes doing video editing put a stain on the system and it will heat up. Since your mac is a few years old it might have some dust build up in the fans or heatsink cooling fins. Use some compressed air to blow them out.

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