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Since the RV770 GPU's initial arrival, we have seen the technology used in the GPU creep up and down AMD's product stack. At first, the RV770 powered only the ATI Radeon HD 4850 and 4870, but soon thereafter two RV770's were linked together to form the current flagship Radeon HD 4870 X2, and then the GPU was scaled down to form the Radeon HD 4600, 4500, and 4300 series of products. Ultimately, AMD ended up with competitive offerings at virtually every price point ranging from $39 on up to over $550. But there is an approximate $80 price gap between the $160-ish Radeon HD 4850 and roughly $80 Radeon HD 4670 that AMD plans to fill today with the release of the Radeon HD 4830.

As its name suggests, this latest addition to the Radeon HD 4800 series is similar to the Radeon HD 4850. In fact, the reference designs look almost identical. The 4830, however, has had a couple of SIMD arrays disabled, and hence has fewer active stream processors and TMUs. Head on over to the site and check it out.
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Source: HotHardware