but the FAQ entry that has this setting listed in it dosn't have the info
The place where the settting is listed isn't in the FAQ, it's in the developer info section.

The only FAQ entry that makes mention of "reservecache" links directly to that developer info section.

And it does have the info. Pretty clearly, too:

Ver 1/2
Section Startup
Option ReserveCache=n
Description (etc...)

Dunno what other information you'd need?
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Tony Fabris