While high-end cards may get the majority of press, it is the mainstream line that does the work for the mass market. The Sapphire Radeon HD 4670 GDDR4 is an excellent mainstream card.
While ultra high-end enthusiasts card may be interesting to read about, the majority of the market looks to purchase inexpensive mainstream edition video cards that offer good performance at the right price. Everyone has different needs when purchasing a video card and this is the reason there are a multitude of models to choose from on both the ATI and NVIDIA side. The Sapphire Radeon HD 4670 is a refresh offering GDDR4 instead of the slower GDDR3. In practice, the difference might not be noticeable, but newer technology is usually better in the long run. The real goal of this card is to provide good performance with a price to match. This is the mainstream card of the ATI line-up.

Sapphire usually manages to put some sort of scantily clad female gaming character on the box to attract the potential buyer. ATI’s primary red color theme is the key here.

The Radeon HD 4670 sticks to the method that AMD is using to power its new generation of cards. They take a design and either scale it up to the high-end of scale down for the lower end. The RV730 is the heart of the Radeon HD 4670 and is basically a lighter version of the RV770 that the Radeon HD 4870 is built on. While the chipset retains support for UVD2 and the latest Shader Model 4.1/OpenGL 2.0, the transistor count comes in at 514 million as opposed to the 956 million of the RV770 series. Even with the drop in transistor count, the RV730 manages to pack in 320 stream processor to provide a variety of functions. Once OpenCL is released in a stable format, these stream processors will be used for a variety of things that the CPU currently does today.

The RV730 series featured a core clock speed of 750MHz along with 512MB of GDDR3 memory running at 1000MHz. The Sapphire Radeon HD 4670 has slighter higher specs in that the card uses GDDR4 memory and it runs at 1100MHz. This card fully supports GPU throttling to save power when not in heavy use. ATI calls this PowerPlay.

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• READ MORE (Source): ASE Labs: Reviews – Sapphire Radeon HD 4670 GDDR4