The Rapide is powered by a 5,935 cc (5.9 L; 362.2 cu in) V12 engine, generating a maximum power output 477 PS (351 kW; 470 hp) and torque of 600 N⋅m (443 lb⋅ft). The car is rear-wheel drive and has a 6-speed Touchtronic II automatic transmission. The Rapide can attain a top speed of 303 km/h (188 mph), and can accelerate from 0 to 100 km/h (62 mph) in 5.2 seconds.

The Rapide's standard features include a tilt-telescoping steering wheel, bi-xenon headlamps and LED taillamps. Leather and walnut wood trim with metallic accents; power front seats with memory, cooling and heating systems; Bluetooth; satellite radio (US version only); with USB and iPod connectivity. Other standard features include a Bang & Olufsen 16-speaker sound system with two tweeters that rise from the dashboard on activation of the system.

The Rapide was designed by stretching the design of the DB9 in order to accommodate an extra set of doors. Aston Martin design director, Marek Reichman has described a thoroughbred race horse as an inspiration, stating that he wanted muscles in the design to be visible through the skin.

The side windows of the car were made to appear like a single unit by using a black B pillar. The roof was designed to be as low as possible so it would mimic the design language of Aston Martin's model lineup. Due to the usage of swan doors and a low roof, the car is difficult for the accommodation of tall people. By comparison, the Porsche Panamera, a competitor of the Rapide, is 2.3 inches taller.

The rear flanks of the car are wider than those on the DB9, thus smoothening the extended roof design. The rear fenders and a curvaceous design language prevent the car as being perceived as stretched. The car makes use of rear lights and diffusers from the Vantage while the front headlamps are unique to the model. Although they would find use on the later Vanquish and the facelift DB9.