what type of monitor connection does the two display ports support ?

The two display ports support video connections.

Does HP Desktop Computer EliteDesk 800 G3-SFF have optical drive? +-DVD RW? HP Specs say DVD writer and DVD Rom; cannot play HD DVD. Discs burned may not be compatible with single-disc DVD players.

Yes, the HP EliteDesk Desktop 800 G3 SFF has an optical drive. It is a DVD±RW drive.

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HP EliteDesk Desktop 800 G3 SFF Intel Core i7 6th Gen 6700 (3.40GHz) 16 GB 512 GB SSD DVDRW Windows 10 Pro

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