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Radeon HD 4870 1GB vs Radeon R9 M280X

Intro

The Radeon HD 4870 1GB makes use of a 55 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 memory works at a speed of 900 MHz on this model. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Compare those specifications to the Radeon R9 M280X, which uses a 28 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 memory works at a speed of 1375 MHz on this model. It features 896 SPUs along with 56 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M280X 75 Watts
Radeon HD 4870 1GB 150 Watts
Difference: 75 Watts (100%)

Memory Bandwidth

In theory, the Radeon HD 4870 1GB is 31% faster than the Radeon R9 M280X overall, due to its higher bandwidth. (explain)

Radeon HD 4870 1GB 115200 MB/sec
Radeon R9 M280X 88000 MB/sec
Difference: 27200 (31%)

Texel Rate

The Radeon R9 M280X should be quite a bit (approximately 68%) more effective at texture filtering than the Radeon HD 4870 1GB. (explain)

Radeon R9 M280X 50400 Mtexels/sec
Radeon HD 4870 1GB 30000 Mtexels/sec
Difference: 20400 (68%)

Pixel Rate

The Radeon R9 M280X is a little bit (more or less 20%) better at AA than the Radeon HD 4870 1GB, and also able to handle higher resolutions while still performing well. (explain)

Radeon R9 M280X 14400 Mpixels/sec
Radeon HD 4870 1GB 12000 Mpixels/sec
Difference: 2400 (20%)

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 1GB

Amazon.com

Check prices at:

Radeon R9 M280X

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 1GB Radeon R9 M280X
Manufacturer AMD AMD
Year Jun 25, 2008 Feb 9 2015
Code Name RV770 XT Saturn XT
Memory 1024 MB 4096 MB
Core Speed 750 MHz 900 MHz
Memory Speed 3600 MHz 5500 MHz
Power (Max TDP) 150 watts 75 watts
Bandwidth 115200 MB/sec 88000 MB/sec
Texel Rate 30000 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 800(160x5) 896
Texture Mapping Units 40 56
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 28 nm
Transistors 956 million (Unknown) million
Bus PCIe 2.0 x16 PCIe 3.0 x16
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 MB per second) that can be transported past the external memory interface within a second. It's worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record 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 card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many 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

Hide Prices

Radeon HD 4870 1GB

Amazon.com

Check prices at:

Radeon R9 M280X

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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