I've maybe found what's the defectiv part: power supply. When one graphic card is ran no crash (for the moment ^^). If it's only this, won't be so expensive & i will be able to wait more the right cards for my new computer ^^!
Btw, i wanted to clarify something on my little project "TV show": there is no sex scene intended! The 1st intention is building a story lane, background & personnalities for Echo & Spencer.