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Radeon HD 5870 vs Radeon HD 7970

Intro

The Radeon HD 5870 features a clock frequency of 850 MHz and a GDDR5 memory speed of 1200 MHz. It also uses a 256-bit bus, and uses a 40 nm design. It is comprised of 1600(320x5) SPUs, 80 Texture Address Units, and 32 Raster Operation Units.

Compare those specifications to the Radeon HD 7970, which makes use of a 28 nm design. AMD has clocked the core frequency at 925 MHz. The GDDR5 memory works at a speed of 1375 MHz on this card. It features 2048 SPUs along with 128 TAUs and 32 ROPs.

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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

Theoretically speaking, the Radeon HD 7970 is 72% quicker than the Radeon HD 5870 overall, 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 much (approximately 74%) faster with regards to AF than the Radeon HD 5870. (explain)

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

Pixel Rate

The Radeon HD 7970 is just a bit (approximately 9%) better at anti-aliasing than the Radeon HD 5870, and capable of handling higher resolutions without slowing down too much. (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

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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
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 data (counted in megabytes per second) that can be transported over the external memory interface in one second. The number is worked out by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many 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”
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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