Thanks guys. As my gaming desktop runs XP, I'm not too concerned by DX 10 or 11, but I understand your point about 10 to be avoided. The 512 MB (GDDR5) one costs me about 90 euro and the 1024 MB (GDDR5) is about 110 euro, so I guess I'll take the 512 MB one if you say it's not expected to make a positive impact on Civ5. Do we have a preference between e.g. ASUS, MSI and Sapphire? Btw, I see some of these HD 5670 cards give a power recommendation of 400 watt. My computer has a built-in power supply of 375 watt. Is that expected to give problems when running at a moderate resolution of 1280 x 1024 or 1650 x 1080?