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Radeon HD 4870 512MB vs Radeon R5 M255

Intro

The Radeon HD 4870 512MB comes with a GPU clock speed of 750 MHz, and the 512 MB of GDDR5 RAM is set to run at 900 MHz through a 256-bit bus. It also is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon R5 M255, which has a clock speed of 940 MHz and a DDR3 memory speed of 1000 MHz. It also makes use of a 64-bit bus, and uses a 28 nm design. It is comprised of 320 SPUs, 20 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 4870 512MB should in theory be a lot better than the Radeon R5 M255 overall. (explain)

Radeon HD 4870 512MB 115200 MB/sec
Radeon R5 M255 16000 MB/sec
Difference: 99200 (620%)

Texel Rate

The Radeon HD 4870 512MB is a lot (about 60%) more effective at anisotropic filtering than the Radeon R5 M255. (explain)

Radeon HD 4870 512MB 30000 Mtexels/sec
Radeon R5 M255 18800 Mtexels/sec
Difference: 11200 (60%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4870 512MB is a better choice, by far. (explain)

Radeon HD 4870 512MB 12000 Mpixels/sec
Radeon R5 M255 7520 Mpixels/sec
Difference: 4480 (60%)

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 4870 512MB

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 4870 512MB Radeon R5 M255
Manufacturer AMD AMD
Year Jun 25, 2008 June 2014
Code Name RV770 XT Jet Pro
Memory 512 MB 2048 MB
Core Speed 750 MHz 940 MHz
Memory Speed 3600 MHz 2000 MHz
Power (Max TDP) 150 watts (Unknown) watts
Bandwidth 115200 MB/sec 16000 MB/sec
Texel Rate 30000 Mtexels/sec 18800 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 7520 Mpixels/sec
Unified Shaders 800(160x5) 320
Texture Mapping Units 40 20
Render Output Units 16 8
Bus Type GDDR5 DDR3
Bus Width 256-bit 64-bit
Fab Process 55 nm 28 nm
Transistors 956 million (Unknown) million
Bus PCIe 2.0 x16 PCIe 3.0 x8
DirectX Version DirectX 10.1 DirectX 11.2
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in MB per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 amount of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total amount of texture units by the core 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour 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 fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4870 512MB

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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