Precision M4600 and FirePro M5950, not throttling GPU clock when idle.

I recently picked up a M4600 (Core i7-2720QM) from Dell Refurbished when they were offering a 40% off sale. Things have been good so far, but I'm noticing weird behavior as far as the GPU clocks/temperatures go.

I am using the latest Catalyst drivers (from AMD site), specifically for this GPU, but the driver (device manager) is dated 2011. If I load a web browser (tried Firefox/Cyberfox/Pale Moon), and do normal browsing, the GPU will throttle up and down from 100mhz normally. Once I load a video (youtube, etc...), the clocks instantly shoot to 725/900 GPU/Memory (1.100v) and stay there until I close the browser, even if the GPU load is 0%. Temperatures, on the other hand, seem not to be effected by this. Temps stay around 51-57C, regardless of the GPU clock, but will randomly drop to the low 40C's. I'm guessing this has to do with the fan. I run the Dell "Cool" power profile unless i need heavy cpu usage. This profile may be keeping the CPU/GPU below the fan turn-on temp.

But anyway, is there any fix for the GPU clock getting "stuck"?

I have not tried going back to the original Dell drivers yet, but I didn't like the scrolling jerkyness in web browsing with these drivers.