The Nitro 640 2008 vs Nitro NX 750 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 NX 750 DC 2005 at 17,0 ft. Weight tells a clearer story for trailering families: the Nitro 640 2008 tips the scales at 1 092 lbs — 954 lbs more than the Nitro NX 750 DC 2005 at 138 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.

The power gap is worth calling out. Rated to 135 hp, the Nitro NX 750 DC 2005 has a 45-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. Fuel capacity breaks the other way: the Nitro 640 2008 carries 24 gallons versus 3 gallons in the Nitro NX 750 DC 2005. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

For family outings this is probably the sharpest distinction between the two. The Nitro NX 750 DC 2005 is rated for 5 passengers, while the Nitro 640 2008 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Nitro NX 750 DC 2005 could be the deciding factor.

At this size, power-to-weight ratio matters more than outright horsepower. The Nitro NX 750 DC 2005 comes in at 1 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.