The Nitro 640 2008 vs Nitro 700 LX DC 2005 comparison sits squarely in the category of decisions where specs alone won't tell the whole story — intended use, storage, and long-term ownership costs all factor in.
On paper these two are close siblings in the size department — Nitro 640 2008 at 18,0 ft versus Nitro 700 LX DC 2005 at 17,0 ft. At 1 092 lbs and 1 183 lbs respectively, both sit in a similar weight class — either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.
The power gap is worth calling out. Rated to 125 hp, the Nitro 700 LX DC 2005 has a 35-hp advantage over the Nitro 640 2008's 90-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads — 24 gal and 24 gal — so range won't be a tiebreaker here.
Both boats are rated for 4 passengers — a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.
At this size, power-to-weight ratio matters more than outright horsepower. The Nitro 700 LX DC 2005 comes in at 10 lbs per hp versus 12 lbs per hp for the Nitro 640 2008. The lower the ratio the more explosive the acceleration — meaningful on a short RIB where bursts of speed, quick planing, and agility in surf or tight waterways define the experience.
The Nitro 640 2008 has a documented top speed of 33 mph. Speed data wasn't available for the other model.
Bottom line: Performance buyers should lean toward the Nitro 700 LX DC 2005 and its 125-hp ceiling. If fuel economy and quieter running matter more than top-end speed, the Nitro 640 2008 with its 90-hp rating is the more economical daily driver.