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Radeon HD 5870 vs Radeon HD 7970

Intro

The Radeon HD 5870 features a GPU core clock speed of 850 MHz, and the 1024 MB of GDDR5 memory runs at 1200 MHz through a 256-bit bus. It also is made up of 1600(320x5) Stream Processors, 80 TAUs, and 32 Raster Operation Units.

Compare that to the Radeon HD 7970, which makes use of a 28 nm design. AMD has clocked the core speed at 925 MHz. The GDDR5 memory runs at a frequency of 1375 MHz on this card. It features 2048 SPUs along with 128 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 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 overall. (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 (about 74%) faster with regards to anisotropic filtering 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 superior to the Radeon HD 5870, not by a very large margin though. (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

Display Prices

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Radeon HD 5870

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

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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
Fab Process 40 nm 28 nm
Bus PCIe 2.1 x16 PCIe 3.0 x16
Memory 1024 MB 3072 MB
Core Speed 850 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 1600(320x5) 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 DirectX 11.1
OpenGL Version OpenGL 3.2 OpenGL 4.2
Power (Max TDP) 188 watts 250 watts
Shader Model 5.0 5.0
Bandwidth 153600 MB/sec 264000 MB/sec
Texel Rate 68000 Mtexels/sec 118400 Mtexels/sec
Pixel Rate 27200 Mpixels/sec 29600 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of information (measured in MB per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the bus width by its memory clock speed. If the card has DDR memory, it must 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 AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the 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 most pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number 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 also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Comments

One Response to “Radeon HD 5870 vs Radeon HD 7970”
[...] 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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