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A few quick questions:
Is the fan powered by a 4 pin molex that connects directly to the PSU or does it run through one of the connectors on the mobo? How is it's speed controlled? Did you splice in a switch, is it on a rheobus, did the fan come with the switch?
When you say it kicks up into higher speeds, does it sustain it or is it just a quick surge.
I'm disinclined to think your PSU is causing this because if it were you'd be having other issues. PSU's that supply erratic voltages can cause some wacky problems. If it's a hardwired control (ie a physical switch or knob) it's possible that a fault in the wiring is causing a short through the switch, which ups the power to the fan and causes a surge in speed. Another possibility is it's intentional. I use Asus' QFan to control my cpu fan's speed; it keeps noise levels from my Volcano 7 bearable under normal conditions but has been known to ramp up the speed under heavy loads or on hot days to keep the cpu properly cooled. This is especially possible if you're using a fan connected to the motherboard (my preferred option anyway because I can monitor fan rpm's and detect potential problems sooner, a boon with the lowered cpu fan speed and the two vantec stealths I have on intake and exhaust duties).
So, yeah. Hope that helps, but without knowing how the fan is set up it's hard to give a definitive answer.
__________________
I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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