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The new SAPPHIRE HD 4550 is a new mainstream product based on the architecture of the highly successful HD 4000 series. With its 80 stream processors, core clock speeds of 600MHz and carrying 512MB of GDDR3 memory clocked at 900MHz (1.8GHz effective) the SAPPHIRE HD 4550 brings features previously associated only with high end cards to the cost conscious user. These include DX 10.1 compatibility, on board hardware UVD version 2.0 with support for AMD’s Avivo HD, HDMI support with 7.1 surround sound as well as extremely low power operation featuring AMD Powerplay dynamic power management.

The SAPPHIRE HD 4350 has a similar architecture, and has the same 80 stream processors and 600MHz core clock speed, but uses the more cost effective DDR2 memory running at 400MHz (800MHz effective). All the other features are similar to the SAPPHIRE HD 4550.