will this fit in a dell OptiPlex 780 sff with a 285 watt power supply and work?

power supply isn't an issue, this card draws little power. In terms of electrical compatibility, as long as you have an 8x or 16x PCI-E slot, you are fine. In terms of physical compatibility, if you have an 8x slot, ensure that it is open on the rear end of the slot (allowing the extra pins on the card to stick on the rear end), and do some measurements to make sure there is enough room for the card in general and that the metal plate with the connectors on it is the right length for your pc.

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GIGABYTE GeForce GT 720 1GB DDR3 PCI Express 2.0 x8 Low Profile Graphics Card GV-N720D3-1GL

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1GB 64-Bit DDR3
Core Clock 797 MHz
1 x DVI 1 x HDMI
PCI Express 2.0 x8

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Overview

Specs

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Model
Brand	GIGABYTE
Model	GV-N720D3-1GL

Interface
Interface	PCI Express 2.0 x8

Chipset
Chipset Manufacturer	NVIDIA
GPU	GeForce GT 720
Core Clock	797 MHz

Memory
Memory Size	1GB
Memory Interface	64-Bit
Memory Type	DDR3

3D API
DirectX	DirectX 11.2
OpenGL	OpenGL 4.4

Ports
HDMI	1 x HDMI
D-SUB	1 x D-SUB
DVI	1 x DVI

Details
Max Resolution	4096 x 2160
Cooler	Single Fan
System Requirements	300W Power Supply
Dual-Link DVI Supported	Yes

Form Factor & Dimensions
Form Factor	Low Profile
Slot Width	Single Slot

Additional Information
First Listed on Newegg	October 14, 2014

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): 3 years
Limited Warranty period (labor): 3 years
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Return Policies

Return for refund within: Non-refundable

Return for replacement within: 30 days

This item is covered by Newegg.com's Replacement Only Return Policy.
15% restocking fee may apply.
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GIGABYTE GeForce GT 720 1GB DDR3 PCI Express 2.0 x8 Low Profile Graphics Card GV-N720D3-1GL

Learn more about the GIGABYTE GV-N720D3-1GL

Customer Reviews of the GIGABYTE GV-N720D3-1GL

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16814125695

GIGABYTE GeForce GT 720 1GB DDR3 PCI Express 2.0 x8 Low Profile Graphics Card GV-N720D3-1GL

Learn more about the GIGABYTE GV-N720D3-1GL

Customer Reviews of the GIGABYTE GV-N720D3-1GL

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info