AssassinsCreed II: "carriage toward Venice" (gameplay on ATI HD 5670)

I emulate this game on alcochol 120% without using dvd ^ ^ because it had some laggs in some parts but it rarely happens, only happened because I used fraps too =.= My configuration is AMD X4 phenon, 4gb memory ran, video card ATI Radeon HD 5670 1GB GDDR5 support with direct x11