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Radeon HD 5970 vs Radeon HD 7870


Intro

The Radeon HD 5970 features a GPU clock speed of 725 MHz, and the 1024 MB of GDDR5 RAM runs at 1000 MHz through a 256-bit bus. It also features 1600 SPUs, 160 Texture Address Units, and 64 ROPs.

Compare that to the Radeon HD 7870, which has a clock frequency of 1000 MHz and a GDDR5 memory speed of 1200 MHz. It also uses a 256-bit memory bus, and uses a 28 nm design. It is made up of 1280 SPUs, 80 Texture Address Units, and 32 Raster Operation Units.

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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 perform quite a bit faster than the Radeon HD 7870 in general. (explain)

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

Texel Rate

The Radeon HD 5970 will be quite a bit (approximately 190%) more effective at texture filtering than the Radeon HD 7870. (explain)

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

Pixel Rate

The Radeon HD 5970 will be quite a bit (about 190%) better at FSAA than the Radeon HD 7870, and able to handle higher resolutions more effectively. (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

Radeon HD 5970

Radeon HD 7870

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
Memory 1024 MB (x2) 2048 MB
Core Speed 725 MHz (x2) 1000 MHz
Memory Speed 4000 MHz (x2) 4800 MHz
Power (Max TDP) 294 watts 175 watts
Bandwidth 256000 MB/sec 153600 MB/sec
Texel Rate 232000 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 92800 Mpixels/sec 32000 Mpixels/sec
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
Fab Process 40 nm 28 nm
Transistors 2154 million 2800 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 again. If 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics 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 graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Radeon HD 5970

Radeon HD 7870

Comments

One Response to “Radeon HD 5970 vs Radeon HD 7870”
Gigabyte 7870 OC 2gb vs. 5970 2Gb says:

[...] 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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