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Radeon HD 7870 XT vs Radeon R9 M295X

Intro

The Radeon HD 7870 XT has core speeds of 925 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs along with 96 TAUs and 32 Rasterization Operator Units.

Compare all of that to the Radeon R9 M295X, which makes use of a 28 nm design. AMD has set the core speed at 750 MHz. The GDDR5 RAM works at a speed of 1375 MHz on this specific card. 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 7870 XT		185 Watts
	Difference: 60 Watts (48%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7870 XT will be 9% quicker than the Radeon R9 M295X overall, because of its greater bandwidth. (explain)

Radeon HD 7870 XT		192000 MB/sec
Radeon R9 M295X		176000 MB/sec
	Difference: 16000 (9%)

Texel Rate

The Radeon R9 M295X will be just a bit (about 8%) faster with regards to anisotropic filtering than the Radeon HD 7870 XT. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon HD 7870 XT		88800 Mtexels/sec
	Difference: 7200 (8%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 7870 XT is the winner, and very much so. (explain)

Radeon HD 7870 XT		29600 Mpixels/sec
Radeon R9 M295X		24000 Mpixels/sec
	Difference: 5600 (23%)

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 XT

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Radeon R9 M295X

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Specifications

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Model	Radeon HD 7870 XT	Radeon R9 M295X
Manufacturer	AMD	AMD
Year	November 2012	2014
Code Name	Tahiti LE	Unknown
Memory	2048 MB	4096 MB
Core Speed	925 MHz	750 MHz
Memory Speed	6000 MHz	5500 MHz
Power (Max TDP)	185 watts	125 watts
Bandwidth	192000 MB/sec	176000 MB/sec
Texel Rate	88800 Mtexels/sec	96000 Mtexels/sec
Pixel Rate	29600 Mpixels/sec	24000 Mpixels/sec
Unified Shaders	1536	2048
Texture Mapping Units	96	128
Render Output Units	32	32
Bus Type	GDDR5	GDDR5
Bus Width	256-bit	256-bit
Fab Process	28 nm	28 nm
Transistors	4313 million	(Unknown) million
Bus	PCIe 3.0 x16	PCIe 3.0 x16
DirectX Version	DirectX 11.1	DirectX 11.2
OpenGL Version	OpenGL 4.3	OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 number of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write 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 core 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 output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

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