Summary: What you get for your six C-bills is an incredibly speedy graphics card that delivers tremendous gaming performance and doesn’t eat kilowatts when idle. So if what you want is the fastest graphics card you can buy, then the XFX Radeon HD 5970 is the card for you. Just make sure your case can handle it.
Pros: Incredible gaming performance; very low idle power usage; XFX's excellent warranty.
Cons: So big you need a huge PC case to hold it; pricey; eats power at full bore.
Conclusion: A few key observations on the Crossfire of two HD 5970s need to be made. First, if you don’t have a powerful CPU, two of these video cards will likely not be GPU bound in any way shape or form but CPU bound. The HD 5970 is a powerful card by itself; two of them in CrossfireX mode are the most powerful solution on the market today, bar none. Two HD 5970s require a big PSU, with a maximum power requirement of 588 Watts just for the video cards alone.