Hi mandy,

Dell Optiplex 380 is configured with 255 watts PSU (Power Supply Unit) but Nvidia GeForce GT 635 video card requires 350 watts and above PSU. Please upgrade the power supply on the system to use the video card.

Sorry for the constant updates...but after doing some checking (read google!) it seems that this model Dell uses a standard ATX PSU therefore I should be able to buy any regular PSU to fit it - yes?

Thanks for the quick reply.

I had a feeling I was going to need to replace the PSU for any graphics card that I chose - which of course gives me another problem - finding a PSU that fits!!  Any ideas?

Thanks

The GT 635 is an OEM card only so I'm not sure where you would buy it anyway as it only comes installed in new systems.  I would try the R7 240.  It only uses 30 watts and will work fine on the 255 watt power supply and play the games he wants.   

Thanks Kelbear1, I was getting the card from a friends computer which is why I could get hold of it.  

I ordered a new Corsair PSU yesterday, after checking the measurements around a 100 times - lol.  It should fit and comes with all the relevant connections - I then have more choice of GPU's so that I can find one that lasts him a couple of years which by then I can build him a new system (building from scratch is easier than modifying/upgrading a pre built system in my experience.

Thanks for all the help and advice.