The other computer, was unless I am mistaken also integrated graphics.
Once you insert the graphics card and connect to that instead of to the graphics on the I/O (Input Output) plate, the computer will use the card.
You may have to disable the integrated graphics in the BIOS setup., but that is a simple procedure.
Re the actual graphics, yes the adaptor will suffice, you need male DVI to female sub D VGA
Please note I have NOT checked the suitability of anything to that computer.
If it were possible, my advice would be to run with the computer and see how things go. Then if your son or you are very disappointed with the graphics, then you can look at a graphcs card and the uprated PSU.
The main reason for this, is as soon as you replace the PSU and the graphics, on a brand new computer, I think you can say bye-bye to any warrantry.
Edited by Macboatmaster, 18 September 2011 - 03:53 AM.