The OptiPlex 755 offers energy-efficient performance, stability and choice in a mainstream business desktop.

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Adding a video card

What video cards can I use to upgrade my system

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mrmac4, your Dell has a PCI Express x16 connector slot which could be used for a video card upgrade. No issues with that at all since a PCI Express graphics card will override the integrated video controller.

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Dell has annoying proprietary motherboards, but this one still allows small form factor PCI-e GPU’s.

If you can explain what you want to use the GPU for, we can select a fitting one for you.

In short:

For HD video playback, an AMD HD4550 should be fine. For light gaming a Nvidia 750 is about the max I would trust the crappy power supply in those things with.

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Upgrades are good and bad. Good if they work and bad if they dont. Would you realy want to gamble with the life of your device like this?

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mrmac4 will be eternally grateful.
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