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Radeon HD 7870 XT vs Radeon HD 7950 3GB

Intro

The Radeon HD 7870 XT has a GPU clock speed of 925 MHz, and the 2048 MB of GDDR5 RAM is set to run at 1500 MHz through a 256-bit bus. It also is made up of 1536 Stream Processors, 96 TAUs, and 32 Raster Operation Units.

Compare that to the Radeon HD 7950 3GB, which comes with a clock frequency of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 384-bit bus, and uses a 28 nm design. It is made up of 1792 SPUs, 112 Texture Address Units, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 XT 185 Watts
Radeon HD 7950 3GB 200 Watts
Difference: 15 Watts (8%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7950 3GB should theoretically be a lot superior to the Radeon HD 7870 XT in general. (explain)

Radeon HD 7950 3GB 240000 MB/sec
Radeon HD 7870 XT 192000 MB/sec
Difference: 48000 (25%)

Texel Rate

The Radeon HD 7950 3GB should be a little bit (about 1%) more effective at anisotropic filtering than the Radeon HD 7870 XT. (explain)

Radeon HD 7950 3GB 89600 Mtexels/sec
Radeon HD 7870 XT 88800 Mtexels/sec
Difference: 800 (1%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 7870 XT is superior to the Radeon HD 7950 3GB, but not by far. (explain)

Radeon HD 7870 XT 29600 Mpixels/sec
Radeon HD 7950 3GB 25600 Mpixels/sec
Difference: 4000 (16%)

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 7870 XT

Amazon.com

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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.

Specifications

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Model Radeon HD 7870 XT Radeon HD 7950 3GB
Manufacturer AMD AMD
Year November 2012 January 2012
Code Name Tahiti LE Tahiti Pro
Memory 2048 MB 3072 MB
Core Speed 925 MHz 800 MHz
Memory Speed 6000 MHz 5000 MHz
Power (Max TDP) 185 watts 200 watts
Bandwidth 192000 MB/sec 240000 MB/sec
Texel Rate 88800 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 29600 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 1536 1792
Texture Mapping Units 96 112
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
Fab Process 28 nm 28 nm
Transistors 4313 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.3 OpenGL 4.2

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of MB per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, 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 amount of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called 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 - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 7870 XT

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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