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Radeon HD 4670 512MB vs Radeon HD 6850

Intro

The Radeon HD 4670 512MB features a GPU core speed of 750 MHz, and the 512 MB of GDDR4/GDDR3/DDR3/DDR2 memory runs at 1000 MHz through a 128-bit bus. It also is comprised of 320(64x5) Stream Processors, 32 Texture Address Units, and 8 ROPs.

Compare those specs to the Radeon HD 6850, which comes with GPU clock speed of 775 MHz, and 1024 MB of GDDR5 memory running at 1000 MHz through a 256-bit bus. It also is comprised of 960 Stream Processors, 48 Texture Address Units, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB 70 Watts
Radeon HD 6850 127 Watts
Difference: 57 Watts (81%)

Memory Bandwidth

The Radeon HD 6850 should in theory perform much faster than the Radeon HD 4670 512MB in general. (explain)

Radeon HD 6850 128000 MB/sec
Radeon HD 4670 512MB 32000 MB/sec
Difference: 96000 (300%)

Texel Rate

The Radeon HD 6850 should be a lot (about 55%) faster with regards to AF than the Radeon HD 4670 512MB. (explain)

Radeon HD 6850 37200 Mtexels/sec
Radeon HD 4670 512MB 24000 Mtexels/sec
Difference: 13200 (55%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6850 is superior to the Radeon HD 4670 512MB, by far. (explain)

Radeon HD 6850 24800 Mpixels/sec
Radeon HD 4670 512MB 6000 Mpixels/sec
Difference: 18800 (313%)

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 4670 512MB

Amazon.com

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Radeon HD 6850

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 4670 512MB Radeon HD 6850
Manufacturer AMD AMD
Year Sep 10, 2008 October 2010
Code Name RV730 XT Barts Pro
Memory 512 MB 1024 MB
Core Speed 750 MHz 775 MHz
Memory Speed 2000 MHz 4000 MHz
Power (Max TDP) 70 watts 127 watts
Bandwidth 32000 MB/sec 128000 MB/sec
Texel Rate 24000 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 6000 Mpixels/sec 24800 Mpixels/sec
Unified Shaders 320(64x5) 960
Texture Mapping Units 32 48
Render Output Units 8 32
Bus Type GDDR4/GDDR3/DDR3/DDR2 GDDR5
Bus Width 128-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 514 million 1700 million
Bus PCIe 2.0 x16, AGP 8x PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be transported across the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 4670 512MB

Amazon.com

Check prices at:

Radeon HD 6850

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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