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Radeon HD 4870 X2 vs Radeon HD 7970

Intro

The Radeon HD 4870 X2 features a GPU core speed of 750 MHz, and the 1024 MB of GDDR5 memory is set to run at 900 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 Texture Address Units, and 16 ROPs.

Compare all of that to the Radeon HD 7970, which has core clock speeds of 925 MHz on the GPU, and 1375 MHz on the 3072 MB of GDDR5 RAM. It features 2048 SPUs along with 128 Texture Address Units and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7970 250 Watts
Radeon HD 4870 X2 350 Watts
Difference: 100 Watts (40%)

Memory Bandwidth

Theoretically, the Radeon HD 7970 should perform just a bit faster than the Radeon HD 4870 X2 in general. (explain)

Radeon HD 7970 264000 MB/sec
Radeon HD 4870 X2 230400 MB/sec
Difference: 33600 (15%)

Texel Rate

The Radeon HD 7970 is much (approximately 97%) better at anisotropic filtering than the Radeon HD 4870 X2. (explain)

Radeon HD 7970 118400 Mtexels/sec
Radeon HD 4870 X2 60000 Mtexels/sec
Difference: 58400 (97%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7970 is a better choice, by far. (explain)

Radeon HD 7970 29600 Mpixels/sec
Radeon HD 4870 X2 24000 Mpixels/sec
Difference: 5600 (23%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 4870 X2

Amazon.com

Check prices at:

Radeon HD 7970

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 X2 Radeon HD 7970
Manufacturer AMD AMD
Year Aug 12, 2008 January 2012
Code Name R700 Tahiti XT
Memory 1024 MB (x2) 3072 MB
Core Speed 750 MHz (x2) 925 MHz
Memory Speed 3600 MHz (x2) 5500 MHz
Power (Max TDP) 350 watts 250 watts
Bandwidth 230400 MB/sec 264000 MB/sec
Texel Rate 60000 Mtexels/sec 118400 Mtexels/sec
Pixel Rate 24000 Mpixels/sec 29600 Mpixels/sec
Unified Shaders 800(160x5) (x2) 2048
Texture Mapping Units 40 (x2) 128
Render Output Units 16 (x2) 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 384-bit
Fab Process 55 nm 28 nm
Transistors 956 million 4313 million
Bus PCIe 2.0 x16 (PCIe bridge) PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of MB per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 amount of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The better this number, the better the video card will be at handling 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 chip can possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 4870 X2

Amazon.com

Check prices at:

Radeon HD 7970

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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