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Radeon HD 4670 512MB vs Radeon HD 6850

Intro

The Radeon HD 4670 512MB has a core clock speed of 750 MHz and a GDDR4/GDDR3/DDR3/DDR2 memory frequency of 1000 MHz. It also features a 128-bit bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 32 TAUs, and 8 Raster Operation Units.

Compare all of that to the Radeon HD 6850, which uses a 40 nm design. AMD has clocked the core speed at 775 MHz. The GDDR5 RAM is set to run at a frequency of 1000 MHz on this card. It features 960 SPUs as well as 48 TAUs 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

In theory, the Radeon HD 6850 is 300% quicker than the Radeon HD 4670 512MB overall, due to its greater data rate. (explain)

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

Texel Rate

The Radeon HD 6850 is much (about 55%) more effective at 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

The Radeon HD 6850 will be quite a bit (approximately 313%) more effective at full screen anti-aliasing than the Radeon HD 4670 512MB, and also capable of handling higher resolutions better. (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: Bandwidth is the largest amount of data (counted in megabytes per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach 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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