Brand manufacturers publish lists of memory modules that are guaranteed with Optiplex 780 MT. Examples:
http://www.crucial.com/usa/en/compatible-memory-for/Dell/optiplex-780-mini-tower
How big is a chance a random memory module
- not listed in lists of brand manufacturers (see above)
- within Dell's specifications, i.e. non-ECC, 1066 or 1333, max 4GB per slot)
would work with Optiplex 780?
Is there a way how to increase the chance a new memory would work, e.g. choosing Single Rank / Double Rank, choosing a manufacturer etc.?