Thanks Plutom - did just that

Lots of interesting discussions. One individual asserts that:

Quote -
To run in dual channel you need the ram installed in pairs. If you have an odd number of sticks it reverts to single channel. CPU-Z is reporting the correct FSB of your system at 200mHz. The ram is DDR (Double Data Rate) Hence it is rated at 400 mHz. The optimum configuration for your system is with pairs of PC3200 sticks running in dual channel mode.

Which to me means that if I have 2 gig the same plugged into the first two slots, and 1 500meg that is different plugged into the 3rd slot - even though there are 3 slots - it's not a good idea to populate that slot because then all RAM will run in single-channel mode instead of dual channel mode

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks