I don't see in the specs or from the pictures, what video our ports these have? Vga, hdmi, dvi?

The computer only has a VGA port.

Is there a working pci express x16 slot on this motherboard?

the board comes with 2 pci express x16 slots. "working"...not sure as i haven't attempted to use them yet.

Questions & Answers: Refurbished: HP Desktop PC 8100 SFF Intel Core i3-530 4GB 1TB HDD Windows 7 Professional 64-Bit

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Item#: N82E16883280629
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HP 8100 Elite [Microsoft Authorized Recertified] Small Form Factor Desktop PC with Intel Core i3-530 (2.93GHz), 4GB RAM, 1TB HDD, DVDRW, Windows 7 Professional 64-Bit

Fast CPU Clock Speed at 2.93Ghz
Intermediate 4GB RAM and 1TB Storage
64 Bit Windows OS
Front and Rear Audio Ports
Spacious Chassis for Easy Upgrade
DisplayPort Output

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