Thanks to K404 and Largon i succeed to clock my HD3870 to 1008mhz, here some results(1.5v vgpu and watercooled):
http://img114.imageshack.us/img114/8...5262861rs7.jpg
http://img503.imageshack.us/img503/7...6154531ff4.jpg
http://img503.imageshack.us/img503/7...331c335b65.jpg
Some crossfire results befor the mod, have te find how to clock both cards over overdrive limits:
http://img140.imageshack.us/img140/4...3762391zd3.jpg
http://img46.imageshack.us/img46/1423/3d05307291fy1.jpg
http://img503.imageshack.us/img503/1...6234891iu3.jpg
http://img503.imageshack.us/img503/1...b66298b0ce.jpg