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Radeon HD 4870 512MB vs Radeon R5 M255

Intro

The Radeon HD 4870 512MB uses a 55 nm design. AMD has set the core frequency at 750 MHz. The GDDR5 memory works at a frequency of 900 MHz on this specific card. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Compare those specifications to the Radeon R5 M255, which has clock speeds of 940 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 RAM. It features 320 SPUs along with 20 TAUs and 8 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 4870 512MB should theoretically 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 will be much (about 60%) faster with regards to texture 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

The Radeon HD 4870 512MB should be much (approximately 60%) faster with regards to FSAA than the Radeon R5 M255, and able to handle higher resolutions better. (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: Bandwidth is the max amount of data (measured in megabytes per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the clock speed of the card. 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 lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to 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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