I have seen the stihl 090 rated as high as 13 horspower. However after reading what some of the more senior members here had to say, it seems that often those older HP ratings were often inflated. People that own and use the 090 seem to think it more likely that it is about 10-10 1/2 Hp. I own an 090 and it is a beast by any definition, but since I don't own anything else that big with accurate Hp ratings it's hard to say for sure. 10 horses is so much in a saw that it might as well be 13 as far as I am concerned. So with that big dolmar, if the same level of exageration holds true, then actual HP would probably be more like 9.5-10.(still huge by any standard)