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Radeon HD 7870 vs Radeon R9 M295X

Intro

The Radeon HD 7870 has a GPU core clock speed of 1000 MHz, and the 2048 MB of GDDR5 memory is set to run at 1200 MHz through a 256-bit bus. It also is made up of 1280 Stream Processors, 80 TAUs, and 32 Raster Operation Units.

Compare all that to the Radeon R9 M295X, which comes with a clock speed of 750 MHz and a GDDR5 memory frequency of 1375 MHz. It also features a 256-bit memory bus, and makes use of a 28 nm design. It is made up of 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X 125 Watts
Radeon HD 7870 175 Watts
Difference: 50 Watts (40%)

Memory Bandwidth

The Radeon R9 M295X should in theory be a bit faster than the Radeon HD 7870 overall. (explain)

Radeon R9 M295X 176000 MB/sec
Radeon HD 7870 153600 MB/sec
Difference: 22400 (15%)

Texel Rate

The Radeon R9 M295X will be a bit (approximately 20%) more effective at AF than the Radeon HD 7870. (explain)

Radeon R9 M295X 96000 Mtexels/sec
Radeon HD 7870 80000 Mtexels/sec
Difference: 16000 (20%)

Pixel Rate

The Radeon HD 7870 will be a lot (more or less 33%) faster with regards to FSAA than the Radeon R9 M295X, and will be able to handle higher resolutions more effectively. (explain)

Radeon HD 7870 32000 Mpixels/sec
Radeon R9 M295X 24000 Mpixels/sec
Difference: 8000 (33%)

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 7870

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 7870 Radeon R9 M295X
Manufacturer AMD AMD
Year March 2012 2014
Code Name Pitcairn XT Unknown
Memory 2048 MB 4096 MB
Core Speed 1000 MHz 750 MHz
Memory Speed 4800 MHz 5500 MHz
Power (Max TDP) 175 watts 125 watts
Bandwidth 153600 MB/sec 176000 MB/sec
Texel Rate 80000 Mtexels/sec 96000 Mtexels/sec
Pixel Rate 32000 Mpixels/sec 24000 Mpixels/sec
Unified Shaders 1280 2048
Texture Mapping Units 80 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 2800 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x16
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 (measured in MB per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster 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 is worked out by multiplying the total amount of 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 in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 7870

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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