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#11
Many thanks theveterans, Dude & AddRAM,
Your respective, enlightening comments have been most helpful. Without them, whilst I looked at the respective specs my understanding of them wasn't sufficient to have made a valid choice. As my sister is very unlikely to get anywhere near gaming or very graphic intensive applications, I will not bother to install the NVidia 9500GT which, anyway, will ease the load on the 550W PSU.
Pedro