Over the past few months we have looked at several Sapphire graphics cards including the Radeon HD 4670, Radeon HD 4850 Toxic, Radeon HD 4870, and Radeon HD 4870 Toxic Vapor-X. All of these cards have performed quite well on Linux with the Catalyst Linux driver and there is even open-source support for these R700 series graphics cards, except that goes without any hardware acceleration at this time. The graphics cards introduced up to this point though haven't exactly been cheap, but ATI has now introduced their low-end graphics cards for the Radeon HD 4000 series. With Sapphire being a key ATI partner, they have of course introduced news models accordingly. What we have our hands on today is the Sapphire Radeon HD 4550 512MB, which is a PCI Express graphics card that retails for a mere $50~60 USD.