Strange movement on graphs

Hi all, sorta new to this forum so I'm sorry if I'm posting this in the wrong area.

I need a little help. I've been monitoring the graphs on RivaTuner and things having been looking strange lately.

Ambient Temp, Fan Speed, Fan Duty Cycle and Sensor Supply Voltage.

I've attached a few pictures to show whats going on.

I see these random spikes happening and I have no idea why. I would idle and watch the graphs move and every little bit, I'll see a spike somewhere on the graphs.

Should I be worried? What is causing this? Is the video card starting to die?

So I have Q6600, EVGA Nvidia 8800GT, 6Gigs of G.Skill ram (DDR2 800), ASUS P5K-E Motherboard, OCZ GameXStream 600W Power Supply.

I also just upgraded to Windows Seven.

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