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Radeon HD 5870 vs Radeon HD 7970

Intro

The Radeon HD 5870 makes use of a 40 nm design. AMD has clocked the core frequency at 850 MHz. The GDDR5 RAM runs at a frequency of 1200 MHz on this card. It features 1600(320x5) SPUs along with 80 TAUs and 32 Rasterization Operator Units.

Compare those specs to the Radeon HD 7970, which features GPU clock speed of 925 MHz, and 3072 MB of GDDR5 memory running at 1375 MHz through a 384-bit bus. It also is made up of 2048 SPUs, 128 TAUs, and 32 ROPs.

(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

In theory, the Radeon HD 7970 should be 72% quicker than the Radeon HD 5870 in general, due to its greater data rate. (explain)

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

Texel Rate

The Radeon HD 7970 should be quite a bit (more or less 74%) better 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 a high screen resolution is important to you, then the Radeon HD 7970 is a better choice, though not by far. (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

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 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: Memory bandwidth is the maximum amount of data (counted in MB per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the bus width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could 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 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 output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum 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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