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Radeon HD 7870 vs Radeon HD 7970

Intro

The Radeon HD 7870 has clock speeds of 1000 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 RAM. It features 1280 SPUs along with 80 Texture Address Units and 32 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7970, which uses a 28 nm design. AMD has clocked the core speed at 925 MHz. The GDDR5 memory is set to run at a frequency of 1375 MHz on this card. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 175 Watts
Radeon HD 7970 250 Watts
Difference: 75 Watts (43%)

Memory Bandwidth

Performance-wise, the Radeon HD 7970 should in theory be quite a bit better than the Radeon HD 7870 in general. (explain)

Radeon HD 7970 264000 MB/sec
Radeon HD 7870 153600 MB/sec
Difference: 110400 (72%)

Texel Rate

The Radeon HD 7970 is a lot (more or less 48%) better at anisotropic filtering than the Radeon HD 7870. (explain)

Radeon HD 7970 118400 Mtexels/sec
Radeon HD 7870 80000 Mtexels/sec
Difference: 38400 (48%)

Pixel Rate

The Radeon HD 7870 is just a bit (more or less 8%) more effective at FSAA than the Radeon HD 7970, and also will be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 7870 32000 Mpixels/sec
Radeon HD 7970 29600 Mpixels/sec
Difference: 2400 (8%)

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

Radeon HD 7870

Amazon.com

Radeon HD 7970

Amazon.com

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

Model Radeon HD 7870 Radeon HD 7970
Manufacturer AMD AMD
Year March 2012 January 2012
Code Name Pitcairn XT Tahiti XT
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 3072 MB
Core Speed 1000 MHz 925 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1200 MHz (4800 MHz effective) 1375 MHz (5500 MHz effective)
Unified Shaders 1280 2048
Texture Mapping Units 80 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2
Power (Max TDP) 175 watts 250 watts
Shader Model 5.0 5.0
Bandwidth 153600 MB/sec 264000 MB/sec
Texel Rate 80000 Mtexels/sec 118400 Mtexels/sec
Pixel Rate 32000 Mpixels/sec 29600 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in megabytes per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on 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 bandwidth is, the lower the ability to reach the max fill rate.

Comments

2 Responses to “Radeon HD 7870 vs Radeon HD 7970”
andrew says:
people at hardware compare do you mind telling me how the 7970 is better then the 7870 at everything else but the 7870 is better at handling higher resolutions? makes no sense
Richard says:
Has a higher pixel rate

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