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Radeon HD 5870 vs Radeon HD 7970


Intro

The Radeon HD 5870 uses a 40 nm design. AMD has set the core frequency at 850 MHz. The GDDR5 memory works at a speed of 1200 MHz on this model. It features 1600(320x5) SPUs as well as 80 Texture Address Units and 32 Rasterization Operator Units.

Compare all that to the Radeon HD 7970, which comes with a GPU core clock speed of 925 MHz, and 3072 MB of GDDR5 RAM set to run at 1375 MHz through a 384-bit bus. It also features 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5870 188 Watts
Radeon HD 7970 250 Watts
Difference: 62 Watts (33%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7970 should in theory be quite a bit superior to the Radeon HD 5870 in general. (explain)

Radeon HD 7970 264000 MB/sec
Radeon HD 5870 153600 MB/sec
Difference: 110400 (72%)

Texel Rate

The Radeon HD 7970 will be a lot (approximately 74%) more effective at AF than the Radeon HD 5870. (explain)

Radeon HD 7970 118400 Mtexels/sec
Radeon HD 5870 68000 Mtexels/sec
Difference: 50400 (74%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7970 is a better choice, though only just barely. (explain)

Radeon HD 7970 29600 Mpixels/sec
Radeon HD 5870 27200 Mpixels/sec
Difference: 2400 (9%)

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 5870

Radeon HD 7970

Specifications

Display Specifications

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Model Radeon HD 5870 Radeon HD 7970
Manufacturer AMD AMD
Year September 23, 2009 January 2012
Code Name Cypress XT Tahiti XT
Memory 1024 MB 3072 MB
Core Speed 850 MHz 925 MHz
Memory Speed 4800 MHz 5500 MHz
Power (Max TDP) 188 watts 250 watts
Bandwidth 153600 MB/sec 264000 MB/sec
Texel Rate 68000 Mtexels/sec 118400 Mtexels/sec
Pixel Rate 27200 Mpixels/sec 29600 Mpixels/sec
Unified Shaders 1600(320x5) 2048
Texture Mapping Units 80 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
Fab Process 40 nm 28 nm
Transistors 2154 million 4313 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 3.2 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of MB per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better 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 worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, 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 could possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Radeon HD 5870

Radeon HD 7970

Comments

One Response to “Radeon HD 5870 vs Radeon HD 7970”
PC Zusammnstellung, was meint ihr? says:

[...] ist ja schnell genug, aber wenns am Geld nicht fehlt hol dir die 7970. Kannst ja mal hier gucken, Radeon HD 5870 vs Radeon HD 7970 – Performance Comparison Benchmarks @ Hardware Compare Zitieren + Antworten Gehe zu: Komplette Rechner: Zusammenstellung [...]

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