Napatech capture cards, are the "Cadillac" and absolutely the best capture cards on the planet. The adapters are designed with top-of-the-line features which are all performed in hardware. The cards on the low-end, start with line interfaces from 1 Giga-bits-per-second (Gpbs) all the way to 40Gbps at full line rate, but line-speed is only half the story.