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HP Prodesk 490 G3 ?
Microsoft Windows 10 (64-bit)

is it possible to upgrade graphicscard in this pc ? and if wich one will fit ? 

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Please read the HP "quickspecs" for your computer model


a quick glance shows several cards are available from hp, but i see by the model numbers that they are all under the pci-e 75 watt limit meaning that they lack a aux GPU power connector that midrange/hi-end video cards have due to this your stock power supply will not have the aux gpu cable and the stock power supply may not be able to handle higher powered cards

you can not change the stock 300 watt supply as it's an non ATX model (IE-custom pinout)


you might be able to replace the power supply with a 3rd party ATX supply using a 3rd party adapter  but i'm not aware of any at this time (but this could change)


the nvidia 750TI and the 1050 models should work just make sure they do not have a AUX gpu connection and draw less than 75 watts (check specs on the nvidia website)  i know that the 750 card was/is available in models with and without the aux gpu connector

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