P750ZM vs P650SG: comparing fan noise and thermals at idle & load?

I'm thinking of taking the plunge on a P750ZM (with Xeon CPU and 980m) for desktop replacement, but wondering if anyone can say how the noise compares to the smaller P650SG? I've read that the fan runs constantly at idle so I'm interested in both idle and load fan noise (by load I mean gaming, not synthetic benchmarks or xtu stress test). Reviews suggest that there's only ~2db difference between the two, but they don't comment on the kind of noise (high pitched, whistling, etc).

I'm also...

P750ZM vs P650SG: comparing fan noise and thermals at idle & load?

P750ZM vs P650SG: comparing fan noise and thermals at idle & load?