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Radeon HD 3470 256MB vs Radeon HD 4670 1GB

Intro

The Radeon HD 3470 256MB has a core clock frequency of 800 MHz and a DDR2 memory speed of 950 MHz. It also features a 128-bit bus, and makes use of a 55 nm design. It is comprised of 40(8x5) SPUs, 4 TAUs, and 4 ROPs.

Compare that to the Radeon HD 4670 1GB, which features a GPU core clock speed of 750 MHz, and 1024 MB of GDDR4/GDDR3/DDR3/DDR2 RAM running at 1100 MHz through a 128-bit bus. It also is comprised of 320(64x5) SPUs, 32 TAUs, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 4670 1GB should in theory be a little bit superior to the Radeon HD 3470 256MB in general. (explain)

Radeon HD 4670 1GB 35200 MB/sec
Radeon HD 3470 256MB 30400 MB/sec
Difference: 4800 (16%)

Texel Rate

The Radeon HD 4670 1GB is quite a bit (more or less 650%) more effective at texture filtering than the Radeon HD 3470 256MB. (explain)

Radeon HD 4670 1GB 24000 Mtexels/sec
Radeon HD 3470 256MB 3200 Mtexels/sec
Difference: 20800 (650%)

Pixel Rate

The Radeon HD 4670 1GB should be much (about 88%) faster with regards to anti-aliasing than the Radeon HD 3470 256MB, and also able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 4670 1GB 6000 Mpixels/sec
Radeon HD 3470 256MB 3200 Mpixels/sec
Difference: 2800 (88%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

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Radeon HD 3470 256MB

Amazon.com

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Radeon HD 4670 1GB

Amazon.com

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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 3470 256MB Radeon HD 4670 1GB
Manufacturer AMD AMD
Year 2008 Sep 10, 2008
Code Name RV620 PRO RV730 XT
Memory 256 MB 1024 MB
Core Speed 800 MHz 750 MHz
Memory Speed 1900 MHz 2200 MHz
Power (Max TDP) (Unknown) watts 70 watts
Bandwidth 30400 MB/sec 35200 MB/sec
Texel Rate 3200 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 3200 Mpixels/sec 6000 Mpixels/sec
Unified Shaders 40(8x5) 320(64x5)
Texture Mapping Units 4 32
Render Output Units 4 8
Bus Type DDR2 GDDR4/GDDR3/DDR3/DDR2
Bus Width 128-bit 128-bit
Fab Process 55 nm 55 nm
Transistors (Unknown) million 514 million
Bus PCIe 2.0 x16 PCIe 2.0 x16, AGP 8x
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of data (measured in MB per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 3470 256MB

Amazon.com

Check prices at:

Radeon HD 4670 1GB

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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