Yes, that's the bucket size for the GPU renders. These are my final quality render settings. The 75 pixel samples might be a little overkill at times. I can get away with lowering them if I use the denoising, but sometimes that messes with the texture details so I go with the higher settings. Most renders are done in 20 minutes or less, and there's no rush for me, so it's fine.

I don't know of a GPU memory monitor.

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Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

Today I break my own personal record for the number of days for being alive.
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I use Poser 13 and win 10