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Radeon HD 4870 2GB vs Radeon R9 M295X

Intro

The Radeon HD 4870 2GB makes use of a 55 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 RAM is set to run at a speed of 900 MHz on this card. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Compare that to the Radeon R9 M295X, which makes use of a 28 nm design. AMD has clocked the core speed at 750 MHz. The GDDR5 RAM works at a frequency of 1375 MHz on this particular model. It features 2048 SPUs as well as 128 TAUs and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X 125 Watts
Radeon HD 4870 2GB 150 Watts
Difference: 25 Watts (20%)

Memory Bandwidth

Performance-wise, the Radeon R9 M295X should in theory be much superior to the Radeon HD 4870 2GB in general. (explain)

Radeon R9 M295X 176000 MB/sec
Radeon HD 4870 2GB 115200 MB/sec
Difference: 60800 (53%)

Texel Rate

The Radeon R9 M295X should be a lot (about 220%) faster with regards to anisotropic filtering than the Radeon HD 4870 2GB. (explain)

Radeon R9 M295X 96000 Mtexels/sec
Radeon HD 4870 2GB 30000 Mtexels/sec
Difference: 66000 (220%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R9 M295X is the winner, by a large margin. (explain)

Radeon R9 M295X 24000 Mpixels/sec
Radeon HD 4870 2GB 12000 Mpixels/sec
Difference: 12000 (100%)

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 2GB

Amazon.com

Check prices at:

Radeon R9 M295X

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 2GB Radeon R9 M295X
Manufacturer AMD AMD
Year Jun 25, 2008 2014
Code Name RV770 XT Unknown
Memory 2048 MB 4096 MB
Core Speed 750 MHz 750 MHz
Memory Speed 3600 MHz 5500 MHz
Power (Max TDP) 150 watts 125 watts
Bandwidth 115200 MB/sec 176000 MB/sec
Texel Rate 30000 Mtexels/sec 96000 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 24000 Mpixels/sec
Unified Shaders 800(160x5) 2048
Texture Mapping Units 40 128
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-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: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the interface width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 number is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 4870 2GB

Amazon.com

Check prices at:

Radeon R9 M295X

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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