|Thanks Phil for your advice much appreciated. I am sure my PC has one PCIe slot, but I will double check this.|
I have checked the system requirements for the HD 7750 now and can see that it is recommended to have 4GB RAM and a better PSU. I originally thought a 250W PSU was sufficient based on customer reviews I read about this graphics card, as Skip seems to think also (thanks for your input Skip also).
I have also now looked at the HD 6670 low profile spec requirements and this does not appear to need more RAM than I have. So I have a choice really. It is not easy to choose because I would have no idea what PSU to choose for my system, altho I know its going to have to be a micro one, so any help with this is appreciated (dimensions of current PSU are in orignal post)
It is a problem for all I want to do is bring my graphics card inline with WorldofWarcraft minimum recommendations,https://eu.battle.net/support/en/article/minimum-system-requirements-for-world-of-warcraft
and both the HD6000 and HD7000 series are on their list as recommended cards.
Thanks again, if you can help further.