 6 pin (75 watt 3+3, becoming rare now), 8 pin (150 watt 4+4), and 16 pin (300 watt 8+8) power plugs are all common in today's graphics cards.CrossFire can be implemented with GPU cards of the same generation, and manufacture (this is compared to Nvidia's SLI, which generally only works if all cards have the same GPU, and brand).This allows buyers who have varying budgets over time to purchase different cards and still get the benefits of increased performance.