Hi, i have the EMachines E4064 listed here. http://uk.emachines.com/support/product_support.html?cat=Desktops&subcat=4000 Series&model=E4064 It only has a 300 watt power supply. Bestec model ATX 300 - RE REV - F1R. I have had a look inside the machine today, and i do not really fancy the job of upgrading the PSU, and as i am not a gamer, i do not need a high powered card, i only really want one to get rid of the on board card and free up the memory that it uses. I dont want to go ahead myself and pick one in case it will put too much of a strain on the PSU, and as there are many knowledgeable people on this forum i am hoping that some of you can help point me in the right direction. I will look forward to any recommendations and advice. Thank you.