Top speed: 16 of 16 variants rated.
Rover 623 Si tops the Rover 600-Series ranking by Top speed, at 216 km/h (134 mph).
Across 16 ranked variants, Top speed spans from 185 km/h (115 mph) to 216 km/h (134 mph).
| # | Variant | Year | Body | Fuel | Top speed |
|---|---|---|---|---|---|
| 1 | Rover 623 Si | 1994 | Sedan | Petrol | 216 km/h (134 mph) |
| 2 | Rover 620 Si Business | 1997 | Sedan | Petrol | 200 km/h (124 mph) |
| 3 | Rover 620 Si Luxe | 1996 | Sedan | Petrol | 200 km/h (124 mph) |
| 4 | Rover 620 Si+1 | 1993 | Sedan | Petrol | 200 km/h (124 mph) |
| 5 | Rover 620i Luxe | 1995 | Sedan | Petrol | 197 km/h (122 mph) |
| 6 | Rover 620i | 1993 | Sedan | Petrol | 197 km/h (122 mph) |
| 7 | Rover 618i | 1998 | Sedan | Petrol | 195 km/h (121 mph) |
| 8 | Rover 618i Cambridge | 1998 | Sedan | Petrol | 195 km/h (121 mph) |
| 9 | Rover 618i E | 1997 | Sedan | Petrol | 195 km/h (121 mph) |
| 10 | Rover 618 Si | 1997 | Sedan | Petrol | 195 km/h (121 mph) |
| 11 | Rover 618i+1 | 1996 | Sedan | Petrol | 195 km/h (121 mph) |
| 12 | Rover 618 Si | 1996 | Sedan | Petrol | 195 km/h (121 mph) |
| 13 | Rover 620 Di Cambridge | 1998 | Sedan | Diesel | 185 km/h (115 mph) |
| 14 | Rover 620 Di E | 1997 | Sedan | Diesel | 185 km/h (115 mph) |
| 15 | Rover 620 SDi | 1996 | Sedan | Diesel | 185 km/h (115 mph) |
| 16 | Rover 620 Di | 1995 | Sedan | Diesel | 185 km/h (115 mph) |