Thank you for your answer !
Happy new year to you and all Scythe !
Just something to help if someone else has an A8N-E, I found an image of Ninja Plus RevB on A8N-E motherboard, and it's not totally compatible :
http://img525.imageshack.us/img525/5576/cimg1933ab8.jpg
Personnally, I will wait the new Ninja Cu and I hope it will be without problem
Thank you !