Hi Hawklan,
Welcome to the forum
Well I'd call them warmish.

At the moment i'm still refining my cooling options, that's why as you probably saw earlier i'd like to try the missing retension clips. Although i'm not sure that a 40mm fan would be sufficient.
The actuallity is probably some where between Buff & Clunks perceptions.. On my p5k I used a Thermalright HR-09U on the Mossfet area. I had a digital thermal sensor attached which read 40~45C. Now that was attached to the cooler rather than being a signalled temp, which probably means the chip temp was 53C ish ?? At peak that means i have an extra 20C to get rid off (more if you allow that i have a 60mm fan on it now.)
So I guess in answer to your question about 20C~30C is probably unique to this board.
I noticed no
PWM heat issues on the Gigabyte X38 DQ6 which has a
very substantial copper heatsink. I'm not sure about the maximus, not having had 1st hand experience.
It really depends on your case & preference, also what you describe as mild over clocking.

The values i'm quoting is with 1.3v vcc & 8x450
If your mild ocing &
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really want to keep heat / noise down
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is paramount then the copper heatsink of the DQ6 & lower temps would probably suit you best, The quad has the edge on it performance wise. As always you pays your money & makes your choice.
Luck