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Radeon HD 5670 vs Radeon HD 7870

Intro

The Radeon HD 5670 comes with a GPU clock speed of 775 MHz, and the 1024 MB of GDDR5 memory runs at 1000 MHz through a 128-bit bus. It also is comprised of 400(80x5) Stream Processors, 20 TAUs, and 8 Raster Operation Units.

Compare those specs to the Radeon HD 7870, which features a core clock frequency of 1000 MHz and a GDDR5 memory frequency of 1200 MHz. It also uses a 256-bit memory bus, and makes use of a 28 nm design. It is comprised 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 5670 61 Watts
Radeon HD 7870 175 Watts
Difference: 114 Watts (187%)

Memory Bandwidth

Performance-wise, the Radeon HD 7870 should in theory be much better than the Radeon HD 5670 overall. (explain)

Radeon HD 7870 153600 MB/sec
Radeon HD 5670 64000 MB/sec
Difference: 89600 (140%)

Texel Rate

The Radeon HD 7870 should be much (approximately 416%) faster with regards to anisotropic filtering than the Radeon HD 5670. (explain)

Radeon HD 7870 80000 Mtexels/sec
Radeon HD 5670 15500 Mtexels/sec
Difference: 64500 (416%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7870 is superior to the Radeon HD 5670, and very much so. (explain)

Radeon HD 7870 32000 Mpixels/sec
Radeon HD 5670 6200 Mpixels/sec
Difference: 25800 (416%)

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 5670

Amazon.com

Check prices at:

Radeon HD 7870

Amazon.com

Check prices at:

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 5670 Radeon HD 7870
Manufacturer AMD AMD
Year January 14, 2010 March 2012
Code Name Redwood XT Pitcairn XT
Memory 1024 MB 2048 MB
Core Speed 775 MHz 1000 MHz
Memory Speed 4000 MHz 4800 MHz
Power (Max TDP) 61 watts 175 watts
Bandwidth 64000 MB/sec 153600 MB/sec
Texel Rate 15500 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 6200 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 400(80x5) 1280
Texture Mapping Units 20 80
Render Output Units 8 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 40 nm 28 nm
Transistors 627 million 2800 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 maximum amount of information (in units of MB per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the interface width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's 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 number of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the clock 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 also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 5670

Amazon.com

Check prices at:

Radeon HD 7870

Amazon.com

Check prices at:

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.

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