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Radeon HD 4870 X2 vs Radeon HD 7950

Intro

The Radeon HD 4870 X2 has a clock speed of 750 MHz and a GDDR5 memory frequency of 900 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It features 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 7950, which features core clock speeds of 800 MHz on the GPU, and 1250 MHz on the 1536 MB of GDDR5 memory. It features 1792 SPUs along with 112 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7950 200 Watts
Radeon HD 4870 X2 350 Watts
Difference: 150 Watts (75%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7950 should perform just a bit faster than the Radeon HD 4870 X2 overall. (explain)

Radeon HD 7950 240000 MB/sec
Radeon HD 4870 X2 230400 MB/sec
Difference: 9600 (4%)

Texel Rate

The Radeon HD 7950 will be quite a bit (about 49%) better at AF than the Radeon HD 4870 X2. (explain)

Radeon HD 7950 89600 Mtexels/sec
Radeon HD 4870 X2 60000 Mtexels/sec
Difference: 29600 (49%)

Pixel Rate

The Radeon HD 7950 will be a small bit (approximately 7%) more effective at AA than the Radeon HD 4870 X2, and capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 7950 25600 Mpixels/sec
Radeon HD 4870 X2 24000 Mpixels/sec
Difference: 1600 (7%)

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 7950

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 7950
Manufacturer AMD AMD
Year Aug 12, 2008 January 2012
Code Name R700 Tahiti Pro
Memory 1024 MB (x2) 1536 MB
Core Speed 750 MHz (x2) 800 MHz
Memory Speed 3600 MHz (x2) 5000 MHz
Power (Max TDP) 350 watts 200 watts
Bandwidth 230400 MB/sec 240000 MB/sec
Texel Rate 60000 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 24000 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 800(160x5) (x2) 1792
Texture Mapping Units 40 (x2) 112
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: Bandwidth is the largest amount of information (counted in MB per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the video 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 chip can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Radeon HD 4870 X2

Amazon.com

Check prices at:

Radeon HD 7950

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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