That's a 5x7, the catalog lists the saw as being for use on timbers up to 6" x 8". The only saws I have that cut faster plug into the wall or burn gasoline.

I've used it on 8"x 9" timbers semi-effectively but it's really slowing down at that point due to shortened strokes and requires a bit of over stearing (in rips) to keep any mid-kerf deflection from crossing the line.

One benefit nobody has mentioned is the position of the timber is higher while cutting so you can build your saw horses up at a comfortable height for layout.