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Radeon HD 7870 XT vs Radeon R9 M295X

Intro

The Radeon HD 7870 XT features a GPU core clock speed of 925 MHz, and the 2048 MB of GDDR5 RAM runs at 1500 MHz through a 256-bit bus. It also is comprised of 1536 SPUs, 96 TAUs, and 32 ROPs.

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

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

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

Texel Rate

The Radeon R9 M295X should be a little bit (about 8%) better at 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

The Radeon HD 7870 XT should be quite a bit (approximately 23%) faster with regards to full screen anti-aliasing than the Radeon R9 M295X, and also should be able to handle higher screen resolutions more effectively. (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: Bandwidth is the max amount of information (measured in MB per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. 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 amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at 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 that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

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