Compatibility of nForce2 (Ultra) 400 and DDR modules

Since the nForce2 (Ultra) 400 memory controller is known to be a bit picky
about the modules it will properly deal with, are there any first hand
experiences available here, about how well it can do with 512MB DDR400(+)
modules, which are built with either:

- 8× 512Mb-chips 64M (8k×2k×4bnk) × 8bit, single sided/banked or
- 8× 512Mb-chips 32M (8k×1k×4bnk) ×16bit, double sided/banked or
- 16× 256Mb-chips 64M (8k×2k×4bnk) × 4bit, single sided/banked or
- 16× 256Mb-chips 32M (8k×1k×4bnk) × 8bit, double sided/banked

What I understand so far, the first 2 variants are still very rare (those
chips by now are usually only used for 1 and 2GB modules), while the last
variant seems to be the most commonly offered one for the higher quality
6-layer no-names and brands, but apparently for cheap, 4-layer modules the
last but one version seems to be quite common.

Is this observation correct so far?

So how well then is it dealing in real life with 4-layer and 6-layer CL2,
CL2.5 and CL3 no-name modules, made with any those different chip
combinations and are there any significant differences in this respect
between the single and dual channel modes/versions and additionally also
with a mix of same sized but differently organised modules, according to the
above listing (which shouldn't, since there are two independent memory
controllers, one for each channel) for that controller?

Wolfi