OCC has published a review on the Sapphire HD5550 Ultimate
A quote from the article:
>> Sapphire HD5550 Ultimate Review
The DirectCompute 5.0 technology is going to allow you to use the card for CAD applications and give you better performance than using an integrated video solution. DVD and Blu-ray playback is also a big plus with this card if you are looking to build an HTPC, as it will allow you to use what ever format disc you wish to, only being limited to the drive that you have installed in the system.
>> Sapphire HD5550 Ultimate Review