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Radeon HD 4870 512MB vs Radeon HD 6970

Intro

The Radeon HD 4870 512MB comes with a GPU clock speed of 750 MHz, and the 512 MB of GDDR5 RAM runs at 900 MHz through a 256-bit bus. It also features 800(160x5) Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Compare all of that to the Radeon HD 6970, which comes with GPU core speed of 880 MHz, and 2048 MB of GDDR5 memory running at 1375 MHz through a 256-bit bus. It also features 1536 Stream Processors, 96 Texture Address Units, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4870 512MB 150 Watts
Radeon HD 6970 250 Watts
Difference: 100 Watts (67%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6970 should be 53% quicker than the Radeon HD 4870 512MB overall, due to its higher data rate. (explain)

Radeon HD 6970 176000 MB/sec
Radeon HD 4870 512MB 115200 MB/sec
Difference: 60800 (53%)

Texel Rate

The Radeon HD 6970 should be much (approximately 182%) more effective at anisotropic filtering than the Radeon HD 4870 512MB. (explain)

Radeon HD 6970 84480 Mtexels/sec
Radeon HD 4870 512MB 30000 Mtexels/sec
Difference: 54480 (182%)

Pixel Rate

The Radeon HD 6970 should be much (approximately 135%) more effective at anti-aliasing than the Radeon HD 4870 512MB, and also will be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 6970 28160 Mpixels/sec
Radeon HD 4870 512MB 12000 Mpixels/sec
Difference: 16160 (135%)

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 4870 512MB

Amazon.com

Check prices at:

Radeon HD 6970

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.

Specifications

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Model Radeon HD 4870 512MB Radeon HD 6970
Manufacturer AMD AMD
Year Jun 25, 2008 December 2010
Code Name RV770 XT Cayman XT
Memory 512 MB 2048 MB
Core Speed 750 MHz 880 MHz
Memory Speed 3600 MHz 5500 MHz
Power (Max TDP) 150 watts 250 watts
Bandwidth 115200 MB/sec 176000 MB/sec
Texel Rate 30000 Mtexels/sec 84480 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 28160 Mpixels/sec
Unified Shaders 800(160x5) 1536
Texture Mapping Units 40 96
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 956 million 2640 million
Bus PCIe 2.0 x16 PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of MB per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the interface width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 4870 512MB

Amazon.com

Check prices at:

Radeon HD 6970

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.

Comments

2 Responses to “Radeon HD 4870 512MB vs Radeon HD 6970”
GPU Upgrade Advice Needed... says:

[...] you will see a good performance, just from the 4 series to 6 series jump. Heres a great comparison Radeon HD 4870 512MB vs Radeon HD 6970 – Performance Comparison Benchmarks @ Hardware Compare All in all you wouldnt be disappointed or ripped off getting a 6970. I7 950 D0@ 4.1Ghz [...]

malik usama says:

4870 is best card

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