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Radeon HD 4870 X2 vs Radeon HD 7950 3GB

Intro

The Radeon HD 4870 X2 makes use of a 55 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 RAM is set to run at a frequency of 900 MHz on this particular card. It features 800(160x5) SPUs as well as 40 TAUs and 16 ROPs.

Compare those specifications to the Radeon HD 7950 3GB, which uses a 28 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 memory is set to run at a frequency of 1250 MHz on this particular model. 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 3GB 200 Watts
Radeon HD 4870 X2 350 Watts
Difference: 150 Watts (75%)

Memory Bandwidth

The Radeon HD 7950 3GB should in theory be a little bit faster than the Radeon HD 4870 X2 overall. (explain)

Radeon HD 7950 3GB 240000 MB/sec
Radeon HD 4870 X2 230400 MB/sec
Difference: 9600 (4%)

Texel Rate

The Radeon HD 7950 3GB will be much (about 49%) better at texture filtering than the Radeon HD 4870 X2. (explain)

Radeon HD 7950 3GB 89600 Mtexels/sec
Radeon HD 4870 X2 60000 Mtexels/sec
Difference: 29600 (49%)

Pixel Rate

The Radeon HD 7950 3GB should be just a bit (approximately 7%) better at FSAA than the Radeon HD 4870 X2, and will be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 7950 3GB 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

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Radeon HD 7950 3GB

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 4870 X2 Radeon HD 7950 3GB
Manufacturer AMD AMD
Year Aug 12, 2008 January 2012
Code Name R700 Tahiti Pro
Memory 1024 MB (x2) 3072 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: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This is calculated by multiplying the total texture units of the card by the core clock 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 per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 4870 X2

Amazon.com

Check prices at:

Radeon HD 7950 3GB

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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