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Radeon R9 270 vs Radeon R9 M295X

Intro

The Radeon R9 270 uses a 28 nm design. AMD has set the core speed at 900 MHz. The GDDR5 RAM works at a frequency of 1400 MHz on this particular model. It features 1280 SPUs along with 80 Texture Address Units and 32 ROPs.

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

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X		125 Watts
Radeon R9 270		150 Watts
	Difference: 25 Watts (20%)

Memory Bandwidth

Theoretically, the Radeon R9 270 should be just a bit faster than the Radeon R9 M295X in general. (explain)

Radeon R9 270		179200 MB/sec
Radeon R9 M295X		176000 MB/sec
	Difference: 3200 (2%)

Texel Rate

The Radeon R9 M295X will be quite a bit (about 33%) better at anisotropic filtering than the Radeon R9 270. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon R9 270		72000 Mtexels/sec
	Difference: 24000 (33%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 270 is the winner, but not by far. (explain)

Radeon R9 270		28800 Mpixels/sec
Radeon R9 M295X		24000 Mpixels/sec
	Difference: 4800 (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 R9 270

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Radeon R9 M295X

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Specifications

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Model	Radeon R9 270	Radeon R9 M295X
Manufacturer	AMD	AMD
Year	November 2013	2014
Code Name	Curacao Pro	Unknown
Memory	2048 MB	4096 MB
Core Speed	900 MHz	750 MHz
Memory Speed	5600 MHz	5500 MHz
Power (Max TDP)	150 watts	125 watts
Bandwidth	179200 MB/sec	176000 MB/sec
Texel Rate	72000 Mtexels/sec	96000 Mtexels/sec
Pixel Rate	28800 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 11.2	DirectX 11.2
OpenGL Version	OpenGL 4.3	OpenGL 4.3

Memory Bandwidth: Bandwidth is the largest amount of data (in units of megabytes per second) that can be transported past the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the graphics 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 maximum number of pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines 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 output 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 reach the maximum fill rate.

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