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Radeon HD 7970 vs Radeon R5 M255

Intro

The Radeon HD 7970 features core speeds of 925 MHz on the GPU, and 1375 MHz on the 3072 MB of GDDR5 RAM. It features 2048 SPUs as well as 128 TAUs and 32 ROPs.

Compare all that to the Radeon R5 M255, which features a clock speed of 940 MHz and a DDR3 memory frequency of 1000 MHz. It also makes use of a 64-bit bus, and uses a 28 nm design. It is made up of 320 SPUs, 20 Texture Address Units, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 7970 should in theory perform much faster 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 will be a lot (more or less 530%) better at AF 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 a high resolution 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 maximum amount of data (counted in MB per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better 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 applied per second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling 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 the video card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core clock speed. 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 quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach 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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