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Radeon HD 7970 vs Radeon R5 M255

Intro

The Radeon HD 7970 comes with a clock frequency of 925 MHz and a GDDR5 memory frequency of 1375 MHz. It also uses a 384-bit bus, and makes use of a 28 nm design. It is comprised of 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Compare those specifications to the Radeon R5 M255, which has a core clock speed of 940 MHz and a DDR3 memory speed of 1000 MHz. It also uses a 64-bit bus, and uses a 28 nm design. It is made up of 320 SPUs, 20 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 7970 should in theory be much better than the Radeon R5 M255 in general. (explain)

Radeon HD 7970 264000 MB/sec
Radeon R5 M255 16000 MB/sec
Difference: 248000 (1550%)

Texel Rate

The Radeon HD 7970 is quite a bit (approximately 530%) faster with regards to texture filtering than the Radeon R5 M255. (explain)

Radeon HD 7970 118400 Mtexels/sec
Radeon R5 M255 18800 Mtexels/sec
Difference: 99600 (530%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7970 is superior to the Radeon R5 M255, and very much so. (explain)

Radeon HD 7970 29600 Mpixels/sec
Radeon R5 M255 7520 Mpixels/sec
Difference: 22080 (294%)

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 7970

Amazon.com

Check prices at:

Radeon R5 M255

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 7970 Radeon R5 M255
Manufacturer AMD AMD
Year January 2012 June 2014
Code Name Tahiti XT Jet Pro
Memory 3072 MB 2048 MB
Core Speed 925 MHz 940 MHz
Memory Speed 5500 MHz 2000 MHz
Power (Max TDP) 250 watts (Unknown) watts
Bandwidth 264000 MB/sec 16000 MB/sec
Texel Rate 118400 Mtexels/sec 18800 Mtexels/sec
Pixel Rate 29600 Mpixels/sec 7520 Mpixels/sec
Unified Shaders 2048 320
Texture Mapping Units 128 20
Render Output Units 32 8
Bus Type GDDR5 DDR3
Bus Width 384-bit 64-bit
Fab Process 28 nm 28 nm
Transistors 4313 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x8
DirectX Version DirectX 11.1 DirectX 11.2
OpenGL Version OpenGL 4.2 OpenGL 4.3

Memory Bandwidth: Bandwidth is the max amount of data (counted in MB per second) that can be transported past the external memory interface within a second. The number is worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster 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 are processed per second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 7970

Amazon.com

Check prices at:

Radeon R5 M255

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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