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Radeon HD 5970 vs Radeon HD 7870

Intro

The Radeon HD 5970 comes with a core clock speed of 725 MHz and a GDDR5 memory frequency of 1000 MHz. It also makes use of a 256-bit memory bus, and uses a 40 nm design. It is comprised of 1600 SPUs, 160 TAUs, and 64 ROPs.

Compare those specifications to the Radeon HD 7870, which has a core clock speed of 1000 MHz and a GDDR5 memory speed of 1200 MHz. It also features a 256-bit bus, and makes use of a 28 nm design. It is made up of 1280 SPUs, 80 Texture Address Units, and 32 ROPs.

Display Graphs

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(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 175 Watts
Radeon HD 5970 294 Watts
Difference: 119 Watts (68%)

Memory Bandwidth

In theory, the Radeon HD 5970 should be 67% faster than the Radeon HD 7870 overall, due to its higher bandwidth. (explain)

Radeon HD 5970 256000 MB/sec
Radeon HD 7870 153600 MB/sec
Difference: 102400 (67%)

Texel Rate

The Radeon HD 5970 is quite a bit (approximately 190%) better at AF than the Radeon HD 7870. (explain)

Radeon HD 5970 232000 Mtexels/sec
Radeon HD 7870 80000 Mtexels/sec
Difference: 152000 (190%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 5970 is a better choice, by a large margin. (explain)

Radeon HD 5970 92800 Mpixels/sec
Radeon HD 7870 32000 Mpixels/sec
Difference: 60800 (190%)

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 5970

Amazon.com

Radeon HD 7870

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

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Model Radeon HD 5970 Radeon HD 7870
Manufacturer AMD AMD
Year November 2009 March 2012
Code Name Hemlock XT Pitcairn XT
Fab Process 40 nm 28 nm
Bus PCIe x16 PCIe 3.0 x16
Memory 1024 MB (x2) 2048 MB
Core Speed 725 MHz (x2) 1000 MHz
Shader Speed N/A MHz (x2) (N/A) MHz
Memory Speed 1000 MHz (4000 MHz effective) (x2) 1200 MHz (4800 MHz effective)
Unified Shaders 1600 (x2) 1280
Texture Mapping Units 160 (x2) 80
Render Output Units 64 (x2) 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 256-bit
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2
Power (Max TDP) 294 watts 175 watts
Shader Model 5.0 5.0
Bandwidth 256000 MB/sec 153600 MB/sec
Texel Rate 232000 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 92800 Mpixels/sec 32000 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of data (measured in MB per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the bus width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 once 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 anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card 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 number of colour ROPs 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 many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Comments

One Response to “Radeon HD 5970 vs Radeon HD 7870”
[...] Gigabyte 7870 OC 2gb vs. 5970 2Gb Radeon HD 5970 vs Radeon HD 7870 – Performance Comparison Benchmarks @ Hardware Compare danach soll die 5970 besser sein, also ist die 7870 besser? Zitieren [...]

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