The Nitro 640 LX 2006 vs Nitro 901 CDX 2008 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 LX 2006 at 16,0 ft versus Nitro 901 CDX 2008 at 19,0 ft. Weight tells a clearer story for trailering families: the Nitro 901 CDX 2008 tips the scales at 1 715 lbs — 623 lbs less than the Nitro 640 LX 2006 at 1 092 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 200 hp, the Nitro 901 CDX 2008 has a 110-hp advantage over the Nitro 640 LX 2006'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 901 CDX 2008 carries 57 gallons versus 24 gallons in the Nitro 640 LX 2006. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
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.
Bottom line: The Nitro 901 CDX 2008 at 19,0 ft is the right call if deck space, comfort, and entertaining are top of your list. The Nitro 640 LX 2006 at 16,0 ft wins on trailering ease, likely lower purchase price, and simpler docking — a solid choice for a buyer who wants more boat for less money.